596 lines
19 KiB
C++
596 lines
19 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 2009-2016, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: localpointer.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2009nov13
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* created by: Markus W. Scherer
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*/
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#ifndef __LOCALPOINTER_H__
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#define __LOCALPOINTER_H__
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/**
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* \file
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* \brief C++ API: "Smart pointers" for use with and in ICU4C C++ code.
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*
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* These classes are inspired by
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* - std::auto_ptr
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* - boost::scoped_ptr & boost::scoped_array
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* - Taligent Safe Pointers (TOnlyPointerTo)
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*
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* but none of those provide for all of the goals for ICU smart pointers:
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* - Smart pointer owns the object and releases it when it goes out of scope.
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* - No transfer of ownership via copy/assignment to reduce misuse. Simpler & more robust.
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* - ICU-compatible: No exceptions.
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* - Need to be able to orphan/release the pointer and its ownership.
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* - Need variants for normal C++ object pointers, C++ arrays, and ICU C service objects.
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*
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* For details see https://icu.unicode.org/design/cpp/scoped_ptr
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*/
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#include "unicode/utypes.h"
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#if U_SHOW_CPLUSPLUS_API
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#include <memory>
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U_NAMESPACE_BEGIN
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/**
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* "Smart pointer" base class; do not use directly: use LocalPointer etc.
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*
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* Base class for smart pointer classes that do not throw exceptions.
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*
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* Do not use this base class directly, since it does not delete its pointer.
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* A subclass must implement methods that delete the pointer:
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* Destructor and adoptInstead().
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*
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* There is no operator T *() provided because the programmer must decide
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* whether to use getAlias() (without transfer of ownership) or orphan()
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* (with transfer of ownership and NULLing of the pointer).
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*
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* @see LocalPointer
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* @see LocalArray
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* @see U_DEFINE_LOCAL_OPEN_POINTER
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* @stable ICU 4.4
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*/
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template<typename T>
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class LocalPointerBase {
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public:
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// No heap allocation. Use only on the stack.
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static void* U_EXPORT2 operator new(size_t) = delete;
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static void* U_EXPORT2 operator new[](size_t) = delete;
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#if U_HAVE_PLACEMENT_NEW
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static void* U_EXPORT2 operator new(size_t, void*) = delete;
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#endif
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/**
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* Constructor takes ownership.
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* @param p simple pointer to an object that is adopted
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* @stable ICU 4.4
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*/
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explicit LocalPointerBase(T *p=NULL) : ptr(p) {}
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/**
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* Destructor deletes the object it owns.
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* Subclass must override: Base class does nothing.
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* @stable ICU 4.4
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*/
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~LocalPointerBase() { /* delete ptr; */ }
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/**
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* NULL check.
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* @return true if ==NULL
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* @stable ICU 4.4
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*/
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UBool isNull() const { return ptr==NULL; }
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/**
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* NULL check.
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* @return true if !=NULL
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* @stable ICU 4.4
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*/
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UBool isValid() const { return ptr!=NULL; }
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/**
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* Comparison with a simple pointer, so that existing code
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* with ==NULL need not be changed.
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* @param other simple pointer for comparison
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* @return true if this pointer value equals other
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* @stable ICU 4.4
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*/
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bool operator==(const T *other) const { return ptr==other; }
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/**
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* Comparison with a simple pointer, so that existing code
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* with !=NULL need not be changed.
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* @param other simple pointer for comparison
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* @return true if this pointer value differs from other
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* @stable ICU 4.4
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*/
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bool operator!=(const T *other) const { return ptr!=other; }
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/**
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* Access without ownership change.
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* @return the pointer value
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* @stable ICU 4.4
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*/
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T *getAlias() const { return ptr; }
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/**
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* Access without ownership change.
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* @return the pointer value as a reference
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* @stable ICU 4.4
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*/
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T &operator*() const { return *ptr; }
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/**
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* Access without ownership change.
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* @return the pointer value
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* @stable ICU 4.4
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*/
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T *operator->() const { return ptr; }
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/**
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* Gives up ownership; the internal pointer becomes NULL.
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* @return the pointer value;
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* caller becomes responsible for deleting the object
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* @stable ICU 4.4
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*/
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T *orphan() {
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T *p=ptr;
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ptr=NULL;
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return p;
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}
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/**
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* Deletes the object it owns,
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* and adopts (takes ownership of) the one passed in.
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* Subclass must override: Base class does not delete the object.
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* @param p simple pointer to an object that is adopted
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* @stable ICU 4.4
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*/
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void adoptInstead(T *p) {
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// delete ptr;
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ptr=p;
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}
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protected:
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/**
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* Actual pointer.
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* @internal
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*/
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T *ptr;
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private:
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// No comparison operators with other LocalPointerBases.
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bool operator==(const LocalPointerBase<T> &other);
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bool operator!=(const LocalPointerBase<T> &other);
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// No ownership sharing: No copy constructor, no assignment operator.
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LocalPointerBase(const LocalPointerBase<T> &other);
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void operator=(const LocalPointerBase<T> &other);
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};
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/**
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* "Smart pointer" class, deletes objects via the standard C++ delete operator.
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* For most methods see the LocalPointerBase base class.
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*
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* Usage example:
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* \code
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* LocalPointer<UnicodeString> s(new UnicodeString((UChar32)0x50005));
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* int32_t length=s->length(); // 2
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* char16_t lead=s->charAt(0); // 0xd900
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* if(some condition) { return; } // no need to explicitly delete the pointer
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* s.adoptInstead(new UnicodeString((char16_t)0xfffc));
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* length=s->length(); // 1
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* // no need to explicitly delete the pointer
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* \endcode
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*
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* @see LocalPointerBase
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* @stable ICU 4.4
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*/
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template<typename T>
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class LocalPointer : public LocalPointerBase<T> {
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public:
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using LocalPointerBase<T>::operator*;
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using LocalPointerBase<T>::operator->;
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/**
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* Constructor takes ownership.
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* @param p simple pointer to an object that is adopted
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* @stable ICU 4.4
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*/
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explicit LocalPointer(T *p=NULL) : LocalPointerBase<T>(p) {}
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/**
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* Constructor takes ownership and reports an error if NULL.
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*
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* This constructor is intended to be used with other-class constructors
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* that may report a failure UErrorCode,
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* so that callers need to check only for U_FAILURE(errorCode)
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* and not also separately for isNull().
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*
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* @param p simple pointer to an object that is adopted
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* @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
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* if p==NULL and no other failure code had been set
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* @stable ICU 55
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*/
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LocalPointer(T *p, UErrorCode &errorCode) : LocalPointerBase<T>(p) {
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if(p==NULL && U_SUCCESS(errorCode)) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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}
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/**
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* Move constructor, leaves src with isNull().
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* @param src source smart pointer
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* @stable ICU 56
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*/
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LocalPointer(LocalPointer<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
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src.ptr=NULL;
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}
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/**
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* Constructs a LocalPointer from a C++11 std::unique_ptr.
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* The LocalPointer steals the object owned by the std::unique_ptr.
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*
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* This constructor works via move semantics. If your std::unique_ptr is
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* in a local variable, you must use std::move.
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*
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* @param p The std::unique_ptr from which the pointer will be stolen.
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* @stable ICU 64
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*/
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explicit LocalPointer(std::unique_ptr<T> &&p)
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: LocalPointerBase<T>(p.release()) {}
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/**
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* Destructor deletes the object it owns.
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* @stable ICU 4.4
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*/
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~LocalPointer() {
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delete LocalPointerBase<T>::ptr;
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}
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/**
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* Move assignment operator, leaves src with isNull().
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* The behavior is undefined if *this and src are the same object.
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* @param src source smart pointer
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* @return *this
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* @stable ICU 56
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*/
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LocalPointer<T> &operator=(LocalPointer<T> &&src) U_NOEXCEPT {
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delete LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=src.ptr;
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src.ptr=NULL;
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return *this;
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}
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/**
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* Move-assign from an std::unique_ptr to this LocalPointer.
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* Steals the pointer from the std::unique_ptr.
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*
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* @param p The std::unique_ptr from which the pointer will be stolen.
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* @return *this
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* @stable ICU 64
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*/
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LocalPointer<T> &operator=(std::unique_ptr<T> &&p) U_NOEXCEPT {
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adoptInstead(p.release());
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return *this;
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}
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/**
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* Swap pointers.
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* @param other other smart pointer
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* @stable ICU 56
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*/
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void swap(LocalPointer<T> &other) U_NOEXCEPT {
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T *temp=LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=other.ptr;
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other.ptr=temp;
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}
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/**
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* Non-member LocalPointer swap function.
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* @param p1 will get p2's pointer
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* @param p2 will get p1's pointer
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* @stable ICU 56
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*/
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friend inline void swap(LocalPointer<T> &p1, LocalPointer<T> &p2) U_NOEXCEPT {
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p1.swap(p2);
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}
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/**
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* Deletes the object it owns,
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* and adopts (takes ownership of) the one passed in.
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* @param p simple pointer to an object that is adopted
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* @stable ICU 4.4
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*/
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void adoptInstead(T *p) {
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delete LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=p;
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}
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/**
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* Deletes the object it owns,
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* and adopts (takes ownership of) the one passed in.
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*
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* If U_FAILURE(errorCode), then the current object is retained and the new one deleted.
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*
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* If U_SUCCESS(errorCode) but the input pointer is NULL,
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* then U_MEMORY_ALLOCATION_ERROR is set,
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* the current object is deleted, and NULL is set.
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*
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* @param p simple pointer to an object that is adopted
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* @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
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* if p==NULL and no other failure code had been set
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* @stable ICU 55
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*/
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void adoptInsteadAndCheckErrorCode(T *p, UErrorCode &errorCode) {
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if(U_SUCCESS(errorCode)) {
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delete LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=p;
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if(p==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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} else {
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delete p;
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}
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}
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/**
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* Conversion operator to a C++11 std::unique_ptr.
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* Disowns the object and gives it to the returned std::unique_ptr.
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*
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* This operator works via move semantics. If your LocalPointer is
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* in a local variable, you must use std::move.
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*
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* @return An std::unique_ptr owning the pointer previously owned by this
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* icu::LocalPointer.
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* @stable ICU 64
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*/
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operator std::unique_ptr<T> () && {
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return std::unique_ptr<T>(LocalPointerBase<T>::orphan());
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}
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};
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/**
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* "Smart pointer" class, deletes objects via the C++ array delete[] operator.
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* For most methods see the LocalPointerBase base class.
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* Adds operator[] for array item access.
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*
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* Usage example:
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* \code
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* LocalArray<UnicodeString> a(new UnicodeString[2]);
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* a[0].append((char16_t)0x61);
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* if(some condition) { return; } // no need to explicitly delete the array
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* a.adoptInstead(new UnicodeString[4]);
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* a[3].append((char16_t)0x62).append((char16_t)0x63).reverse();
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* // no need to explicitly delete the array
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* \endcode
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*
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* @see LocalPointerBase
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* @stable ICU 4.4
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*/
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template<typename T>
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class LocalArray : public LocalPointerBase<T> {
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public:
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using LocalPointerBase<T>::operator*;
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using LocalPointerBase<T>::operator->;
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/**
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* Constructor takes ownership.
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* @param p simple pointer to an array of T objects that is adopted
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* @stable ICU 4.4
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*/
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explicit LocalArray(T *p=NULL) : LocalPointerBase<T>(p) {}
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/**
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* Constructor takes ownership and reports an error if NULL.
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*
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* This constructor is intended to be used with other-class constructors
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* that may report a failure UErrorCode,
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* so that callers need to check only for U_FAILURE(errorCode)
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* and not also separately for isNull().
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*
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* @param p simple pointer to an array of T objects that is adopted
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* @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
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* if p==NULL and no other failure code had been set
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* @stable ICU 56
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*/
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LocalArray(T *p, UErrorCode &errorCode) : LocalPointerBase<T>(p) {
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if(p==NULL && U_SUCCESS(errorCode)) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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}
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/**
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* Move constructor, leaves src with isNull().
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* @param src source smart pointer
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* @stable ICU 56
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*/
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LocalArray(LocalArray<T> &&src) U_NOEXCEPT : LocalPointerBase<T>(src.ptr) {
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src.ptr=NULL;
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}
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/**
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* Constructs a LocalArray from a C++11 std::unique_ptr of an array type.
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* The LocalPointer steals the array owned by the std::unique_ptr.
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*
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* This constructor works via move semantics. If your std::unique_ptr is
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* in a local variable, you must use std::move.
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*
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* @param p The std::unique_ptr from which the array will be stolen.
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* @stable ICU 64
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*/
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explicit LocalArray(std::unique_ptr<T[]> &&p)
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: LocalPointerBase<T>(p.release()) {}
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/**
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* Destructor deletes the array it owns.
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* @stable ICU 4.4
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*/
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~LocalArray() {
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delete[] LocalPointerBase<T>::ptr;
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}
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/**
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* Move assignment operator, leaves src with isNull().
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* The behavior is undefined if *this and src are the same object.
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* @param src source smart pointer
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* @return *this
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* @stable ICU 56
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*/
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LocalArray<T> &operator=(LocalArray<T> &&src) U_NOEXCEPT {
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delete[] LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=src.ptr;
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src.ptr=NULL;
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return *this;
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}
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/**
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* Move-assign from an std::unique_ptr to this LocalPointer.
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* Steals the array from the std::unique_ptr.
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*
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* @param p The std::unique_ptr from which the array will be stolen.
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* @return *this
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* @stable ICU 64
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*/
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LocalArray<T> &operator=(std::unique_ptr<T[]> &&p) U_NOEXCEPT {
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adoptInstead(p.release());
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return *this;
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}
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/**
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* Swap pointers.
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* @param other other smart pointer
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* @stable ICU 56
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*/
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void swap(LocalArray<T> &other) U_NOEXCEPT {
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T *temp=LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=other.ptr;
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other.ptr=temp;
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}
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/**
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* Non-member LocalArray swap function.
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* @param p1 will get p2's pointer
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* @param p2 will get p1's pointer
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* @stable ICU 56
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*/
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friend inline void swap(LocalArray<T> &p1, LocalArray<T> &p2) U_NOEXCEPT {
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p1.swap(p2);
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}
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/**
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* Deletes the array it owns,
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* and adopts (takes ownership of) the one passed in.
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* @param p simple pointer to an array of T objects that is adopted
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* @stable ICU 4.4
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*/
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void adoptInstead(T *p) {
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delete[] LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=p;
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}
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/**
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* Deletes the array it owns,
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* and adopts (takes ownership of) the one passed in.
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*
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* If U_FAILURE(errorCode), then the current array is retained and the new one deleted.
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*
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* If U_SUCCESS(errorCode) but the input pointer is NULL,
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* then U_MEMORY_ALLOCATION_ERROR is set,
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* the current array is deleted, and NULL is set.
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*
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* @param p simple pointer to an array of T objects that is adopted
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* @param errorCode in/out UErrorCode, set to U_MEMORY_ALLOCATION_ERROR
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* if p==NULL and no other failure code had been set
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* @stable ICU 56
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*/
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void adoptInsteadAndCheckErrorCode(T *p, UErrorCode &errorCode) {
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if(U_SUCCESS(errorCode)) {
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delete[] LocalPointerBase<T>::ptr;
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LocalPointerBase<T>::ptr=p;
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if(p==NULL) {
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errorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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} else {
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delete[] p;
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}
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}
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/**
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* Array item access (writable).
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* No index bounds check.
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* @param i array index
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* @return reference to the array item
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* @stable ICU 4.4
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*/
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T &operator[](ptrdiff_t i) const { return LocalPointerBase<T>::ptr[i]; }
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/**
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* Conversion operator to a C++11 std::unique_ptr.
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* Disowns the object and gives it to the returned std::unique_ptr.
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*
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* This operator works via move semantics. If your LocalPointer is
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* in a local variable, you must use std::move.
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*
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* @return An std::unique_ptr owning the pointer previously owned by this
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* icu::LocalPointer.
|
|
* @stable ICU 64
|
|
*/
|
|
operator std::unique_ptr<T[]> () && {
|
|
return std::unique_ptr<T[]>(LocalPointerBase<T>::orphan());
|
|
}
|
|
};
|
|
|
|
/**
|
|
* \def U_DEFINE_LOCAL_OPEN_POINTER
|
|
* "Smart pointer" definition macro, deletes objects via the closeFunction.
|
|
* Defines a subclass of LocalPointerBase which works just
|
|
* like LocalPointer<Type> except that this subclass will use the closeFunction
|
|
* rather than the C++ delete operator.
|
|
*
|
|
* Usage example:
|
|
* \code
|
|
* LocalUCaseMapPointer csm(ucasemap_open(localeID, options, &errorCode));
|
|
* utf8OutLength=ucasemap_utf8ToLower(csm.getAlias(),
|
|
* utf8Out, (int32_t)sizeof(utf8Out),
|
|
* utf8In, utf8InLength, &errorCode);
|
|
* if(U_FAILURE(errorCode)) { return; } // no need to explicitly delete the UCaseMap
|
|
* \endcode
|
|
*
|
|
* @see LocalPointerBase
|
|
* @see LocalPointer
|
|
* @stable ICU 4.4
|
|
*/
|
|
#define U_DEFINE_LOCAL_OPEN_POINTER(LocalPointerClassName, Type, closeFunction) \
|
|
class LocalPointerClassName : public LocalPointerBase<Type> { \
|
|
public: \
|
|
using LocalPointerBase<Type>::operator*; \
|
|
using LocalPointerBase<Type>::operator->; \
|
|
explicit LocalPointerClassName(Type *p=NULL) : LocalPointerBase<Type>(p) {} \
|
|
LocalPointerClassName(LocalPointerClassName &&src) U_NOEXCEPT \
|
|
: LocalPointerBase<Type>(src.ptr) { \
|
|
src.ptr=NULL; \
|
|
} \
|
|
/* TODO: Be agnostic of the deleter function signature from the user-provided std::unique_ptr? */ \
|
|
explicit LocalPointerClassName(std::unique_ptr<Type, decltype(&closeFunction)> &&p) \
|
|
: LocalPointerBase<Type>(p.release()) {} \
|
|
~LocalPointerClassName() { if (ptr != NULL) { closeFunction(ptr); } } \
|
|
LocalPointerClassName &operator=(LocalPointerClassName &&src) U_NOEXCEPT { \
|
|
if (ptr != NULL) { closeFunction(ptr); } \
|
|
LocalPointerBase<Type>::ptr=src.ptr; \
|
|
src.ptr=NULL; \
|
|
return *this; \
|
|
} \
|
|
/* TODO: Be agnostic of the deleter function signature from the user-provided std::unique_ptr? */ \
|
|
LocalPointerClassName &operator=(std::unique_ptr<Type, decltype(&closeFunction)> &&p) { \
|
|
adoptInstead(p.release()); \
|
|
return *this; \
|
|
} \
|
|
void swap(LocalPointerClassName &other) U_NOEXCEPT { \
|
|
Type *temp=LocalPointerBase<Type>::ptr; \
|
|
LocalPointerBase<Type>::ptr=other.ptr; \
|
|
other.ptr=temp; \
|
|
} \
|
|
friend inline void swap(LocalPointerClassName &p1, LocalPointerClassName &p2) U_NOEXCEPT { \
|
|
p1.swap(p2); \
|
|
} \
|
|
void adoptInstead(Type *p) { \
|
|
if (ptr != NULL) { closeFunction(ptr); } \
|
|
ptr=p; \
|
|
} \
|
|
operator std::unique_ptr<Type, decltype(&closeFunction)> () && { \
|
|
return std::unique_ptr<Type, decltype(&closeFunction)>(LocalPointerBase<Type>::orphan(), closeFunction); \
|
|
} \
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* U_SHOW_CPLUSPLUS_API */
|
|
#endif /* __LOCALPOINTER_H__ */
|