471 lines
9.0 KiB
C++
471 lines
9.0 KiB
C++
/*************************************************************************/
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/* dvector.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef DVECTOR_H
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#define DVECTOR_H
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#include "os/memory.h"
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/**
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@author Juan Linietsky <reduzio@gmail.com>
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*/
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extern Mutex* dvector_lock;
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template<class T>
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class DVector {
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mutable MID mem;
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void copy_on_write() {
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if (!mem.is_valid())
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return;
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if (dvector_lock)
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dvector_lock->lock();
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MID_Lock lock( mem );
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if ( *(int*)lock.data() == 1 ) {
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// one reference, means no refcount changes
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if (dvector_lock)
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dvector_lock->unlock();
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return;
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}
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MID new_mem= dynalloc( mem.get_size() );
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if (!new_mem.is_valid()) {
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if (dvector_lock)
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dvector_lock->unlock();
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ERR_FAIL_COND( new_mem.is_valid() ); // out of memory
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}
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MID_Lock dst_lock( new_mem );
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int *rc = (int*)dst_lock.data();
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*rc=1;
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T * dst = (T*)(rc + 1 );
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T * src =(T*) ((int*)lock.data() + 1 );
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int count = (mem.get_size() - sizeof(int)) / sizeof(T);
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for (int i=0;i<count;i++) {
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memnew_placement( &dst[i], T(src[i]) );
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}
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(*(int*)lock.data())--;
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// unlock all
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dst_lock=MID_Lock();
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lock=MID_Lock();
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mem=new_mem;
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if (dvector_lock)
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dvector_lock->unlock();
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}
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void reference( const DVector& p_dvector ) {
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unreference();
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if (dvector_lock)
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dvector_lock->lock();
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if (!p_dvector.mem.is_valid()) {
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if (dvector_lock)
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dvector_lock->unlock();
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return;
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}
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MID_Lock lock(p_dvector.mem);
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int * rc = (int*)lock.data();
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(*rc)++;
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lock = MID_Lock();
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mem=p_dvector.mem;
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if (dvector_lock)
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dvector_lock->unlock();
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}
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void unreference() {
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if (dvector_lock)
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dvector_lock->lock();
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if (!mem.is_valid()) {
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if (dvector_lock)
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dvector_lock->unlock();
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return;
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}
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MID_Lock lock(mem);
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int * rc = (int*)lock.data();
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(*rc)--;
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if (*rc==0) {
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// no one else using it, destruct
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T * t= (T*)(rc+1);
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int count = (mem.get_size() - sizeof(int)) / sizeof(T);
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for (int i=0;i<count;i++) {
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t[i].~T();
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}
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}
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lock = MID_Lock();
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mem = MID ();
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if (dvector_lock)
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dvector_lock->unlock();
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}
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public:
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class Read {
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friend class DVector;
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MID_Lock lock;
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const T * mem;
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public:
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_FORCE_INLINE_ const T& operator[](int p_index) const { return mem[p_index]; }
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_FORCE_INLINE_ const T *ptr() const { return mem; }
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Read() { mem=NULL; }
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};
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class Write {
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friend class DVector;
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MID_Lock lock;
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T * mem;
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public:
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_FORCE_INLINE_ T& operator[](int p_index) { return mem[p_index]; }
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_FORCE_INLINE_ T *ptr() { return mem; }
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Write() { mem=NULL; }
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};
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Read read() const {
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Read r;
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if (mem.is_valid()) {
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r.lock = MID_Lock( mem );
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r.mem = (const T*)((int*)r.lock.data()+1);
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}
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return r;
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}
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Write write() {
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Write w;
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if (mem.is_valid()) {
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copy_on_write();
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w.lock = MID_Lock( mem );
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w.mem = (T*)((int*)w.lock.data()+1);
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}
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return w;
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}
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template<class MC>
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void fill_with(const MC& p_mc) {
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int c=p_mc.size();
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resize(c);
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Write w=write();
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int idx=0;
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for(const typename MC::Element *E=p_mc.front();E;E=E->next()) {
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w[idx++]=E->get();
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}
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}
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void remove(int p_index) {
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int s = size();
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ERR_FAIL_INDEX(p_index, s);
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Write w = write();
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for (int i=p_index; i<s-1; i++) {
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w[i]=w[i+1];
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};
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w = Write();
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resize(s-1);
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}
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inline int size() const;
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T get(int p_index) const;
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void set(int p_index, const T& p_val);
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void push_back(const T& p_val);
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void append(const T& p_val) { push_back(p_val); }
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void append_array(const DVector<T>& p_arr) {
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int ds = p_arr.size();
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if (ds==0)
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return;
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int bs = size();
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resize( bs + ds);
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Write w = write();
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Read r = p_arr.read();
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for(int i=0;i<ds;i++)
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w[bs+i]=r[i];
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}
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DVector<T> subarray(int p_from, int p_to) {
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if (p_from<0) {
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p_from=size()+p_from;
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}
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if (p_to<0) {
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p_to=size()+p_to;
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}
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if (p_from<0 || p_from>=size()) {
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DVector<T>& aux=*((DVector<T>*)0); // nullreturn
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ERR_FAIL_COND_V(p_from<0 || p_from>=size(),aux)
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}
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if (p_to<0 || p_to>=size()) {
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DVector<T>& aux=*((DVector<T>*)0); // nullreturn
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ERR_FAIL_COND_V(p_to<0 || p_to>=size(),aux)
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}
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DVector<T> slice;
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int span=1 + p_to - p_from;
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slice.resize(span);
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Read r = read();
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Write w = slice.write();
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for (int i=0; i<span; ++i) {
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w[i] = r[p_from+i];
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}
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return slice;
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}
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Error insert(int p_pos,const T& p_val) {
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int s=size();
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ERR_FAIL_INDEX_V(p_pos,s+1,ERR_INVALID_PARAMETER);
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resize(s+1);
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{
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Write w = write();
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for (int i=s;i>p_pos;i--)
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w[i]=w[i-1];
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w[p_pos]=p_val;
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}
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return OK;
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}
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bool is_locked() const { return mem.is_locked(); }
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inline const T operator[](int p_index) const;
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Error resize(int p_size);
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void invert();
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void operator=(const DVector& p_dvector) { reference(p_dvector); }
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DVector() {}
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DVector(const DVector& p_dvector) { reference(p_dvector); }
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~DVector() { unreference(); }
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};
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template<class T>
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int DVector<T>::size() const {
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return mem.is_valid() ? ((mem.get_size() - sizeof(int)) / sizeof(T) ) : 0;
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}
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template<class T>
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T DVector<T>::get(int p_index) const {
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return operator[](p_index);
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}
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template<class T>
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void DVector<T>::set(int p_index, const T& p_val) {
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if (p_index<0 || p_index>=size()) {
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ERR_FAIL_COND(p_index<0 || p_index>=size());
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}
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Write w = write();
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w[p_index]=p_val;
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}
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template<class T>
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void DVector<T>::push_back(const T& p_val) {
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resize( size() + 1 );
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set( size() -1, p_val );
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}
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template<class T>
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const T DVector<T>::operator[](int p_index) const {
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if (p_index<0 || p_index>=size()) {
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T& aux=*((T*)0); //nullreturn
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ERR_FAIL_COND_V(p_index<0 || p_index>=size(),aux);
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}
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Read r = read();
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return r[p_index];
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}
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template<class T>
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Error DVector<T>::resize(int p_size) {
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if (dvector_lock)
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dvector_lock->lock();
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bool same = p_size==size();
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if (dvector_lock)
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dvector_lock->unlock();
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// no further locking is necesary because we are supposed to own the only copy of this (using copy on write)
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if (same)
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return OK;
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if (p_size == 0 ) {
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unreference();
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return OK;
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}
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copy_on_write(); // make it unique
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ERR_FAIL_COND_V( mem.is_locked(), ERR_LOCKED ); // if after copy on write, memory is locked, fail.
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if (p_size > size() ) {
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int oldsize=size();
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MID_Lock lock;
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if (oldsize==0) {
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mem = dynalloc( p_size * sizeof(T) + sizeof(int) );
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lock=MID_Lock(mem);
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int *rc = ((int*)lock.data());
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*rc=1;
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} else {
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if (dynrealloc( mem, p_size * sizeof(T) + sizeof(int) )!=OK ) {
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ERR_FAIL_V(ERR_OUT_OF_MEMORY); // out of memory
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}
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lock=MID_Lock(mem);
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}
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T *t = (T*)((int*)lock.data() + 1);
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for (int i=oldsize;i<p_size;i++) {
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memnew_placement(&t[i], T );
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}
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lock = MID_Lock(); // clear
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} else {
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int oldsize=size();
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MID_Lock lock(mem);
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T *t = (T*)((int*)lock.data() + 1);
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for (int i=p_size;i<oldsize;i++) {
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t[i].~T();
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}
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lock = MID_Lock(); // clear
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if (dynrealloc( mem, p_size * sizeof(T) + sizeof(int) )!=OK ) {
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ERR_FAIL_V(ERR_OUT_OF_MEMORY); // wtf error
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}
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}
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return OK;
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}
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template<class T>
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void DVector<T>::invert() {
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T temp;
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Write w = write();
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int s = size();
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int half_s = s/2;
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for(int i=0;i<half_s;i++) {
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temp = w[i];
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w[i] = w[s-i-1];
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w[s-i-1] = temp;
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}
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}
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#endif
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