kiper220/mimalloc
1
0
Fork 0
mirror of https://github.com/microsoft/mimalloc.git synced 2025-07-06 11:34:38 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

add STL allocators that use a specific heap and can destroy at the end; see original PR #625 by @vmarkovtsev

Browse source
This commit is contained in:
Daan Leijen 2022-11-22 16:58:32 -08:00
parent 6e2b077b35
commit 9617f16df9
3 changed files with 163 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

118
include/mimalloc.h
View file

@ -456,6 +456,124 @@ template<class T> struct mi_stl_allocator {
template<class T1,class T2> bool operator==(const mi_stl_allocator<T1>& , const mi_stl_allocator<T2>& ) mi_attr_noexcept { return true; }
template<class T1,class T2> bool operator!=(const mi_stl_allocator<T1>& , const mi_stl_allocator<T2>& ) mi_attr_noexcept { return false; }
#if (__cplusplus >= 201103L) || (_MSC_VER > 1900) // C++11
#include <memory> // std::shared_ptr
// STL allocator allocation in a specific heap
template<class T> struct mi_heap_stl_allocator {
typedef T value_type;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef value_type& reference;
typedef value_type const& const_reference;
typedef value_type* pointer;
typedef value_type const* const_pointer;
template <class U> struct rebind { typedef mi_heap_stl_allocator<U> other; };
mi_heap_stl_allocator() {
mi_heap_t* hp = mi_heap_new();
this->heap.reset(hp, heap_delete);
}
mi_heap_stl_allocator(mi_heap_t* hp) : heap(hp) { } /* will not delete or destroy the passed in heap */
mi_heap_stl_allocator(const mi_heap_stl_allocator& x) mi_attr_noexcept : heap(x.heap) { }
template<class U> mi_heap_stl_allocator(const mi_heap_stl_allocator<U>& x) mi_attr_noexcept : heap(x.heap) { }
mi_heap_stl_allocator select_on_container_copy_construction() const { return *this; }
void deallocate(T* p, size_type) { mi_free(p); }
#if (__cplusplus >= 201703L) // C++17
mi_decl_nodiscard T* allocate(size_type count) { return static_cast<T*>(mi_heap_alloc_new_n(this->heap.get(), count, sizeof(T))); }
mi_decl_nodiscard T* allocate(size_type count, const void*) { return allocate(count); }
#else
mi_decl_nodiscard pointer allocate(size_type count, const void* = 0) { return static_cast<pointer>(mi_heap_alloc_new_n(this->heap.get(), count, sizeof(value_type))); }
#endif
#if ((__cplusplus >= 201103L) || (_MSC_VER > 1900)) // C++11
using propagate_on_container_copy_assignment = std::true_type;
using propagate_on_container_move_assignment = std::true_type;
using propagate_on_container_swap = std::true_type;
using is_always_equal = std::false_type;
template <class U, class ...Args> void construct(U* p, Args&& ...args) { ::new(p) U(std::forward<Args>(args)...); }
template <class U> void destroy(U* p) mi_attr_noexcept { p->~U(); }
#else
void construct(pointer p, value_type const& val) { ::new(p) value_type(val); }
void destroy(pointer p) { p->~value_type(); }
#endif
size_type max_size() const mi_attr_noexcept { return (PTRDIFF_MAX / sizeof(value_type)); }
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
void collect(bool force) { mi_heap_collect(this->heap.get(), force); }
protected:
std::shared_ptr<mi_heap_t> heap;
private:
static void heap_delete(mi_heap_t* hp) { if (hp != NULL) { mi_heap_delete(hp); } }
};
template<class T1, class T2> bool operator==(const mi_heap_stl_allocator<T1>& x, const mi_heap_stl_allocator<T2>& y) mi_attr_noexcept { return (x.heap == y.heap); }
template<class T1, class T2> bool operator!=(const mi_heap_stl_allocator<T1>& x, const mi_heap_stl_allocator<T2>& y) mi_attr_noexcept { return (x.heap != y.heap); }
// STL allocator allocation in a specific heap, where `free` does nothing and
// the heap is destroyed in one go on destruction -- use with care!
template<class T> struct mi_heap_destroy_stl_allocator {
typedef T value_type;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef value_type& reference;
typedef value_type const& const_reference;
typedef value_type* pointer;
typedef value_type const* const_pointer;
template <class U> struct rebind { typedef mi_heap_destroy_stl_allocator<U> other; };
mi_heap_destroy_stl_allocator() {
mi_heap_t* hp = mi_heap_new();
this->heap.reset(hp, heap_destroy);
}
mi_heap_destroy_stl_allocator(mi_heap_t* hp) : heap(hp) { } /* will not delete or destroy the passed-in heap; nor free any allocated objects it allocates in the heap! */
mi_heap_destroy_stl_allocator(const mi_heap_destroy_stl_allocator& x) mi_attr_noexcept : heap(x.heap) { }
template<class U> mi_heap_destroy_stl_allocator(const mi_heap_destroy_stl_allocator<U>& x) mi_attr_noexcept : heap(x.heap) { }
mi_heap_destroy_stl_allocator select_on_container_copy_construction() const { return *this; }
void deallocate(T* p, size_type) { /* do nothing as we destroy the heap on destruct. */ }
#if (__cplusplus >= 201703L) // C++17
mi_decl_nodiscard T* allocate(size_type count) { return static_cast<T*>(mi_heap_alloc_new_n(this->heap.get(), count, sizeof(T))); }
mi_decl_nodiscard T* allocate(size_type count, const void*) { return allocate(count); }
#else
mi_decl_nodiscard pointer allocate(size_type count, const void* = 0) { return static_cast<pointer>(mi_heap_alloc_new_n(this->heap.get(), count, sizeof(value_type))); }
#endif
#if ((__cplusplus >= 201103L) || (_MSC_VER > 1900)) // C++11
using propagate_on_container_copy_assignment = std::true_type;
using propagate_on_container_move_assignment = std::true_type;
using propagate_on_container_swap = std::true_type;
using is_always_equal = std::false_type;
template <class U, class ...Args> void construct(U* p, Args&& ...args) { ::new(p) U(std::forward<Args>(args)...); }
template <class U> void destroy(U* p) mi_attr_noexcept { p->~U(); }
#else
void construct(pointer p, value_type const& val) { ::new(p) value_type(val); }
void destroy(pointer p) { p->~value_type(); }
#endif
size_type max_size() const mi_attr_noexcept { return (PTRDIFF_MAX / sizeof(value_type)); }
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
// protected:
std::shared_ptr<mi_heap_t> heap;
private:
static void heap_destroy(mi_heap_t* hp) { if (hp != NULL) { mi_heap_destroy(hp); } }
};
template<class T1, class T2> bool operator==(const mi_heap_destroy_stl_allocator<T1>& x, const mi_heap_destroy_stl_allocator<T2>& y) mi_attr_noexcept { return (x.heap == y.heap); }
template<class T1, class T2> bool operator!=(const mi_heap_destroy_stl_allocator<T1>& x, const mi_heap_destroy_stl_allocator<T2>& y) mi_attr_noexcept { return (x.heap != y.heap); }
#endif // C++11
#endif // __cplusplus
#endif