462 lines
12 KiB
C++
462 lines
12 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef MIN_ALLOCATOR_H
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#define MIN_ALLOCATOR_H
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#include <cstddef>
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#include <cstdlib>
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#include <cstddef>
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#include <cassert>
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#include <climits>
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#include "test_macros.h"
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template <class T>
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class bare_allocator
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{
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public:
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typedef T value_type;
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bare_allocator() TEST_NOEXCEPT {}
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template <class U>
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bare_allocator(bare_allocator<U>) TEST_NOEXCEPT {}
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T* allocate(std::size_t n)
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{
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return static_cast<T*>(::operator new(n*sizeof(T)));
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}
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void deallocate(T* p, std::size_t)
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{
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return ::operator delete(static_cast<void*>(p));
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}
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friend bool operator==(bare_allocator, bare_allocator) {return true;}
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friend bool operator!=(bare_allocator x, bare_allocator y) {return !(x == y);}
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};
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template <class T>
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class no_default_allocator
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{
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#if TEST_STD_VER >= 11
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no_default_allocator() = delete;
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#else
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no_default_allocator();
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#endif
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struct construct_tag {};
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explicit no_default_allocator(construct_tag) {}
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public:
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static no_default_allocator create() {
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construct_tag tag;
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return no_default_allocator(tag);
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}
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public:
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typedef T value_type;
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template <class U>
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no_default_allocator(no_default_allocator<U>) TEST_NOEXCEPT {}
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T* allocate(std::size_t n)
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{
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return static_cast<T*>(::operator new(n*sizeof(T)));
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}
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void deallocate(T* p, std::size_t)
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{
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return ::operator delete(static_cast<void*>(p));
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}
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friend bool operator==(no_default_allocator, no_default_allocator) {return true;}
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friend bool operator!=(no_default_allocator x, no_default_allocator y) {return !(x == y);}
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};
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struct malloc_allocator_base {
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static size_t alloc_count;
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static size_t dealloc_count;
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static bool disable_default_constructor;
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static size_t outstanding_alloc() {
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assert(alloc_count >= dealloc_count);
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return (alloc_count - dealloc_count);
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}
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static void reset() {
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assert(outstanding_alloc() == 0);
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disable_default_constructor = false;
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alloc_count = 0;
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dealloc_count = 0;
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}
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};
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size_t malloc_allocator_base::alloc_count = 0;
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size_t malloc_allocator_base::dealloc_count = 0;
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bool malloc_allocator_base::disable_default_constructor = false;
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template <class T>
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class malloc_allocator : public malloc_allocator_base
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{
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public:
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typedef T value_type;
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malloc_allocator() TEST_NOEXCEPT { assert(!disable_default_constructor); }
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template <class U>
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malloc_allocator(malloc_allocator<U>) TEST_NOEXCEPT {}
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T* allocate(std::size_t n)
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{
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++alloc_count;
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return static_cast<T*>(std::malloc(n*sizeof(T)));
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}
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void deallocate(T* p, std::size_t)
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{
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++dealloc_count;
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std::free(static_cast<void*>(p));
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}
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friend bool operator==(malloc_allocator, malloc_allocator) {return true;}
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friend bool operator!=(malloc_allocator x, malloc_allocator y) {return !(x == y);}
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};
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template <class T>
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struct cpp03_allocator : bare_allocator<T>
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{
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typedef T value_type;
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typedef value_type* pointer;
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static bool construct_called;
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// Returned value is not used but it's not prohibited.
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pointer construct(pointer p, const value_type& val)
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{
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::new(p) value_type(val);
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construct_called = true;
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return p;
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}
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std::size_t max_size() const
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{
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return UINT_MAX / sizeof(T);
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}
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};
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template <class T> bool cpp03_allocator<T>::construct_called = false;
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template <class T>
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struct cpp03_overload_allocator : bare_allocator<T>
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{
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typedef T value_type;
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typedef value_type* pointer;
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static bool construct_called;
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void construct(pointer p, const value_type& val)
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{
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construct(p, val, std::is_class<T>());
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}
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void construct(pointer p, const value_type& val, std::true_type)
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{
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::new(p) value_type(val);
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construct_called = true;
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}
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void construct(pointer p, const value_type& val, std::false_type)
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{
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::new(p) value_type(val);
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construct_called = true;
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}
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std::size_t max_size() const
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{
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return UINT_MAX / sizeof(T);
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}
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};
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template <class T> bool cpp03_overload_allocator<T>::construct_called = false;
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#if TEST_STD_VER >= 11
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#include <memory>
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template <class T, class = std::integral_constant<size_t, 0> > class min_pointer;
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template <class T, class ID> class min_pointer<const T, ID>;
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template <class ID> class min_pointer<void, ID>;
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template <class ID> class min_pointer<const void, ID>;
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template <class T> class min_allocator;
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template <class ID>
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class min_pointer<const void, ID>
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{
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const void* ptr_;
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public:
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min_pointer() TEST_NOEXCEPT = default;
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min_pointer(std::nullptr_t) TEST_NOEXCEPT : ptr_(nullptr) {}
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template <class T>
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min_pointer(min_pointer<T, ID> p) TEST_NOEXCEPT : ptr_(p.ptr_) {}
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explicit operator bool() const {return ptr_ != nullptr;}
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friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
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friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
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template <class U, class XID> friend class min_pointer;
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};
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template <class ID>
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class min_pointer<void, ID>
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{
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void* ptr_;
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public:
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min_pointer() TEST_NOEXCEPT = default;
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min_pointer(std::nullptr_t) TEST_NOEXCEPT : ptr_(nullptr) {}
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template <class T,
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class = typename std::enable_if
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<
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!std::is_const<T>::value
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>::type
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>
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min_pointer(min_pointer<T, ID> p) TEST_NOEXCEPT : ptr_(p.ptr_) {}
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explicit operator bool() const {return ptr_ != nullptr;}
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friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
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friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
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template <class U, class XID> friend class min_pointer;
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};
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template <class T, class ID>
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class min_pointer
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{
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T* ptr_;
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explicit min_pointer(T* p) TEST_NOEXCEPT : ptr_(p) {}
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public:
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min_pointer() TEST_NOEXCEPT = default;
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min_pointer(std::nullptr_t) TEST_NOEXCEPT : ptr_(nullptr) {}
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explicit min_pointer(min_pointer<void, ID> p) TEST_NOEXCEPT : ptr_(static_cast<T*>(p.ptr_)) {}
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explicit operator bool() const {return ptr_ != nullptr;}
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typedef std::ptrdiff_t difference_type;
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typedef T& reference;
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typedef T* pointer;
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typedef T value_type;
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typedef std::random_access_iterator_tag iterator_category;
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reference operator*() const {return *ptr_;}
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pointer operator->() const {return ptr_;}
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min_pointer& operator++() {++ptr_; return *this;}
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min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
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min_pointer& operator--() {--ptr_; return *this;}
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min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
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min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
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min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
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min_pointer operator+(difference_type n) const
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{
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min_pointer tmp(*this);
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tmp += n;
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return tmp;
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}
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friend min_pointer operator+(difference_type n, min_pointer x)
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{
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return x + n;
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}
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min_pointer operator-(difference_type n) const
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{
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min_pointer tmp(*this);
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tmp -= n;
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return tmp;
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}
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friend difference_type operator-(min_pointer x, min_pointer y)
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{
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return x.ptr_ - y.ptr_;
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}
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reference operator[](difference_type n) const {return ptr_[n];}
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friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
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friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
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friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
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friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
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static min_pointer pointer_to(T& t) {return min_pointer(std::addressof(t));}
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friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
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friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
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template <class U, class XID> friend class min_pointer;
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template <class U> friend class min_allocator;
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};
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template <class T, class ID>
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class min_pointer<const T, ID>
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{
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const T* ptr_;
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explicit min_pointer(const T* p) : ptr_(p) {}
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public:
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min_pointer() TEST_NOEXCEPT = default;
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min_pointer(std::nullptr_t) : ptr_(nullptr) {}
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min_pointer(min_pointer<T, ID> p) : ptr_(p.ptr_) {}
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explicit min_pointer(min_pointer<const void, ID> p) : ptr_(static_cast<const T*>(p.ptr_)) {}
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explicit operator bool() const {return ptr_ != nullptr;}
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typedef std::ptrdiff_t difference_type;
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typedef const T& reference;
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typedef const T* pointer;
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typedef const T value_type;
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typedef std::random_access_iterator_tag iterator_category;
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reference operator*() const {return *ptr_;}
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pointer operator->() const {return ptr_;}
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min_pointer& operator++() {++ptr_; return *this;}
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min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
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min_pointer& operator--() {--ptr_; return *this;}
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min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
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min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
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min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
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min_pointer operator+(difference_type n) const
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{
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min_pointer tmp(*this);
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tmp += n;
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return tmp;
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}
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friend min_pointer operator+(difference_type n, min_pointer x)
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{
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return x + n;
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}
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min_pointer operator-(difference_type n) const
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{
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min_pointer tmp(*this);
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tmp -= n;
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return tmp;
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}
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friend difference_type operator-(min_pointer x, min_pointer y)
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{
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return x.ptr_ - y.ptr_;
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}
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reference operator[](difference_type n) const {return ptr_[n];}
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friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
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friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
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friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
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friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
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static min_pointer pointer_to(const T& t) {return min_pointer(std::addressof(t));}
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friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
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friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
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template <class U, class XID> friend class min_pointer;
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};
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template <class T, class ID>
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inline
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bool
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operator==(min_pointer<T, ID> x, std::nullptr_t)
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{
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return !static_cast<bool>(x);
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}
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template <class T, class ID>
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inline
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bool
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operator==(std::nullptr_t, min_pointer<T, ID> x)
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{
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return !static_cast<bool>(x);
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}
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template <class T, class ID>
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inline
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bool
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operator!=(min_pointer<T, ID> x, std::nullptr_t)
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{
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return static_cast<bool>(x);
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}
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template <class T, class ID>
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inline
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bool
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operator!=(std::nullptr_t, min_pointer<T, ID> x)
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{
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return static_cast<bool>(x);
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}
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template <class T>
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class min_allocator
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{
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public:
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typedef T value_type;
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typedef min_pointer<T> pointer;
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min_allocator() = default;
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template <class U>
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min_allocator(min_allocator<U>) {}
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pointer allocate(std::ptrdiff_t n)
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{
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return pointer(static_cast<T*>(::operator new(n*sizeof(T))));
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}
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void deallocate(pointer p, std::ptrdiff_t)
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{
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return ::operator delete(p.ptr_);
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}
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friend bool operator==(min_allocator, min_allocator) {return true;}
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friend bool operator!=(min_allocator x, min_allocator y) {return !(x == y);}
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};
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template <class T>
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class explicit_allocator
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{
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public:
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typedef T value_type;
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explicit_allocator() TEST_NOEXCEPT {}
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template <class U>
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explicit explicit_allocator(explicit_allocator<U>) TEST_NOEXCEPT {}
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T* allocate(std::size_t n)
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{
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return static_cast<T*>(::operator new(n*sizeof(T)));
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}
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void deallocate(T* p, std::size_t)
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{
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return ::operator delete(static_cast<void*>(p));
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}
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friend bool operator==(explicit_allocator, explicit_allocator) {return true;}
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friend bool operator!=(explicit_allocator x, explicit_allocator y) {return !(x == y);}
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};
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#endif // TEST_STD_VER >= 11
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#endif // MIN_ALLOCATOR_H
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