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Merge pull request #1866 from ylavic/std_allocator_traits

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Make StdAllocator C++17-20 compatible.
This commit is contained in:
Milo Yip 2021-03-30 14:31:29 +08:00 committed by GitHub
commit b996a23714
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 84 additions and 26 deletions
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73
include/rapidjson/allocators.h
View File

@ -19,6 +19,10 @@
#include <memory>
#if RAPIDJSON_HAS_CXX11
#include <type_traits>
#endif
RAPIDJSON_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////////
@ -420,6 +424,11 @@ class StdAllocator :
public std::allocator<T>
{
typedef std::allocator<T> allocator_type;
#if RAPIDJSON_HAS_CXX11
typedef std::allocator_traits<allocator_type> traits_type;
#else
typedef allocator_type traits_type;
#endif
public:
typedef BaseAllocator BaseAllocatorType;
@ -449,29 +458,51 @@ public:
~StdAllocator() RAPIDJSON_NOEXCEPT
{ }
typedef typename allocator_type::value_type value_type;
typedef typename allocator_type::pointer pointer;
typedef typename allocator_type::const_pointer const_pointer;
typedef typename allocator_type::reference reference;
typedef typename allocator_type::const_reference const_reference;
typedef typename allocator_type::size_type size_type;
typedef typename allocator_type::difference_type difference_type;
template<typename U>
struct rebind {
typedef StdAllocator<U, BaseAllocator> other;
};
typedef typename traits_type::size_type size_type;
typedef typename traits_type::difference_type difference_type;
typedef typename traits_type::value_type value_type;
typedef typename traits_type::pointer pointer;
typedef typename traits_type::const_pointer const_pointer;
#if RAPIDJSON_HAS_CXX11
using allocator_type::max_size;
using allocator_type::address;
using allocator_type::construct;
using allocator_type::destroy;
#else
size_t max_size() const RAPIDJSON_NOEXCEPT
typedef typename std::add_lvalue_reference<value_type>::type &reference;
typedef typename std::add_lvalue_reference<typename std::add_const<value_type>::type>::type &const_reference;
pointer address(reference r) const RAPIDJSON_NOEXCEPT
{
return allocator_type::max_size();
return std::addressof(r);
}
const_pointer address(const_reference r) const RAPIDJSON_NOEXCEPT
{
return std::addressof(r);
}
size_type max_size() const RAPIDJSON_NOEXCEPT
{
return traits_type::max_size(*this);
}
template <typename ...Args>
void construct(pointer p, Args&&... args)
{
traits_type::construct(*this, p, std::forward<Args>(args)...);
}
void destroy(pointer p)
{
traits_type::destroy(*this, p);
}
#else // !RAPIDJSON_HAS_CXX11
typedef typename allocator_type::reference reference;
typedef typename allocator_type::const_reference const_reference;
pointer address(reference r) const RAPIDJSON_NOEXCEPT
{
@ -482,6 +513,11 @@ public:
return allocator_type::address(r);
}
size_type max_size() const RAPIDJSON_NOEXCEPT
{
return allocator_type::max_size();
}
void construct(pointer p, const_reference r)
{
allocator_type::construct(p, r);
@ -490,7 +526,8 @@ public:
{
allocator_type::destroy(p);
}
#endif
#endif // !RAPIDJSON_HAS_CXX11
template <typename U>
U* allocate(size_type n = 1, const void* = 0)
@ -578,13 +615,13 @@ public:
~StdAllocator() RAPIDJSON_NOEXCEPT
{ }
typedef typename allocator_type::value_type value_type;
template<typename U>
struct rebind {
typedef StdAllocator<U, BaseAllocator> other;
};
typedef typename allocator_type::value_type value_type;
private:
template <typename, typename>
friend class StdAllocator; // access to StdAllocator<!T>.*

29
include/rapidjson/rapidjson.h
View File

@ -124,6 +124,19 @@
#define RAPIDJSON_NAMESPACE_END }
#endif
///////////////////////////////////////////////////////////////////////////////
// __cplusplus macro
//!@cond RAPIDJSON_HIDDEN_FROM_DOXYGEN
#if defined(_MSC_VER)
#define RAPIDJSON_CPLUSPLUS _MSVC_LANG
#else
#define RAPIDJSON_CPLUSPLUS __cplusplus
#endif
//!@endcond
///////////////////////////////////////////////////////////////////////////////
// RAPIDJSON_HAS_STDSTRING
@ -411,7 +424,7 @@ RAPIDJSON_NAMESPACE_END
// Prefer C++11 static_assert, if available
#ifndef RAPIDJSON_STATIC_ASSERT
#if __cplusplus >= 201103L || ( defined(_MSC_VER) && _MSC_VER >= 1800 )
#if RAPIDJSON_CPLUSPLUS >= 201103L || ( defined(_MSC_VER) && _MSC_VER >= 1800 )
#define RAPIDJSON_STATIC_ASSERT(x) \
static_assert(x, RAPIDJSON_STRINGIFY(x))
#endif // C++11
@ -542,7 +555,7 @@ RAPIDJSON_NAMESPACE_END
// C++11 features
#ifndef RAPIDJSON_HAS_CXX11
#define RAPIDJSON_HAS_CXX11 (__cplusplus >= 201103L)
#define RAPIDJSON_HAS_CXX11 (RAPIDJSON_CPLUSPLUS >= 201103L)
#endif
#ifndef RAPIDJSON_HAS_CXX11_RVALUE_REFS
@ -610,9 +623,17 @@ RAPIDJSON_NAMESPACE_END
///////////////////////////////////////////////////////////////////////////////
// C++17 features
#if defined(__has_cpp_attribute)
# if __has_cpp_attribute(fallthrough)
#ifndef RAPIDJSON_HAS_CXX17
#define RAPIDJSON_HAS_CXX17 (RAPIDJSON_CPLUSPLUS >= 201703L)
#endif
#if RAPIDJSON_HAS_CXX17
# define RAPIDJSON_DELIBERATE_FALLTHROUGH [[fallthrough]]
#elif defined(__has_cpp_attribute)
# if __has_cpp_attribute(clang::fallthrough)
# define RAPIDJSON_DELIBERATE_FALLTHROUGH [[clang::fallthrough]]
# elif __has_cpp_attribute(fallthrough)
# define RAPIDJSON_DELIBERATE_FALLTHROUGH __attribute__((fallthrough))
# else
# define RAPIDJSON_DELIBERATE_FALLTHROUGH
# endif

6
test/unittest/allocatorstest.cpp
View File

@ -107,12 +107,12 @@ void TestStdAllocator(const Allocator& a) {
arr[i] = 0x0f0f0f0f;
}
ia.deallocate(arr, 10);
arr = (int *)ia.Malloc(10 * sizeof(int));
arr = Malloc<int>(ia, 10);
EXPECT_TRUE(arr != 0);
for (int i = 0; i < 10; ++i) {
arr[i] = 0x0f0f0f0f;
}
arr = (int *)ia.Realloc(arr, 10 * sizeof(int), 20 * sizeof(int));
arr = Realloc<int>(ia, arr, 10, 20);
EXPECT_TRUE(arr != 0);
for (int i = 0; i < 10; ++i) {
EXPECT_EQ(arr[i], 0x0f0f0f0f);
@ -120,7 +120,7 @@ void TestStdAllocator(const Allocator& a) {
for (int i = 10; i < 20; i++) {
arr[i] = 0x0f0f0f0f;
}
ia.Free(arr);
Free<int>(ia, arr, 20);
int cons = 0, dest = 0;
StdAllocator<TestStdAllocatorData, Allocator> da(a);