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c2630f7314
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9702 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
//===-- Support/MallocAllocator.h - Allocator using malloc/free -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines MallocAllocator class, an STL compatible allocator which
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// just uses malloc/free to get and release memory. The default allocator uses
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// the STL pool allocator runtime library, this explicitly avoids it.
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//
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// This file is used for variety of purposes, including the pool allocator
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// project and testing, regardless of whether or not it's used directly in the
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// LLVM code, so don't delete this from CVS if you think it's unused!
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_MALLOCALLOCATOR_H
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#define SUPPORT_MALLOCALLOCATOR_H
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#include <cstdlib>
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#include <memory>
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template<typename T>
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struct MallocAllocator {
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T value_type;
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template <class U> struct rebind {
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typedef MallocAllocator<U> other;
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};
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pointer address(reference x) const { return &x; }
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const_pointer address(const_reference x) const { return &x; }
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size_type max_size() const { return ~0 / sizeof(T); }
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pointer allocate(size_t n, void* hint = 0) {
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return (pointer)malloc(n*sizeof(T));
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}
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void deallocate(pointer p, size_t n) {
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free((void*)p);
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}
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void construct(pointer p, const T &val) {
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new((void*)p) T(val);
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}
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void destroy(pointer p) {
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p->~T();
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}
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};
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template<typename T>
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inline bool operator==(const MallocAllocator<T> &, const MallocAllocator<T> &) {
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return true;
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}
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template<typename T>
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inline bool operator!=(const MallocAllocator<T>&, const MallocAllocator<T>&) {
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return false;
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}
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#endif
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