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allocator_traits.cpp
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282 lines (246 loc) · 10.6 KB
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// Copyright 2011 Daniel James.
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <boost/core/lightweight_test.hpp>
#include <boost/limits.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/unordered/detail/implementation.hpp>
// Boilerplate
#define ALLOCATOR_METHODS(name) \
template <typename U> struct rebind \
{ \
typedef name<U> other; \
}; \
\
name() {} \
template <typename Y> name(name<Y> const&) {} \
T* address(T& r) { return &r; } \
T const* address(T const& r) { return &r; } \
T* allocate(std::size_t n) \
{ \
return static_cast<T*>(::operator new(n * sizeof(T))); \
} \
T* allocate(std::size_t n, void const*) \
{ \
return static_cast<T*>(::operator new(n * sizeof(T))); \
} \
void deallocate(T* p, std::size_t) { ::operator delete((void*)p); } \
void construct(T* p, T const& t) { new (p) T(t); } \
void destroy(T* p) { p->~T(); } \
std::size_t max_size() const \
{ \
return (std::numeric_limits<std::size_t>::max)(); \
} \
bool operator==(name<T> const&) const { return true; } \
bool operator!=(name<T> const&) const { return false; } \
/**/
#define ALLOCATOR_METHODS_TYPEDEFS(name) \
template <typename U> struct rebind \
{ \
typedef name<U> other; \
}; \
\
name() {} \
template <typename Y> name(name<Y> const&) {} \
pointer address(T& r) { return &r; } \
const_pointer address(T const& r) { return &r; } \
pointer allocate(std::size_t n) \
{ \
return pointer(::operator new(n * sizeof(T))); \
} \
pointer allocate(std::size_t n, void const*) \
{ \
return pointer(::operator new(n * sizeof(T))); \
} \
void deallocate(pointer p, std::size_t) { ::operator delete((void*)p); } \
void construct(T* p, T const& t) { new (p) T(t); } \
void destroy(T* p) { p->~T(); } \
size_type max_size() const \
{ \
return (std::numeric_limits<size_type>::max)(); \
} \
bool operator==(name<T> const&) const { return true; } \
bool operator!=(name<T> const&) const { return false; } \
/**/
struct yes_type
{
enum
{
value = true
};
};
struct no_type
{
enum
{
value = false
};
};
// For tracking calls...
static int selected;
void reset() { selected = 0; }
template <typename Allocator> int call_select()
{
typedef boost::unordered::detail::allocator_traits<Allocator> traits;
Allocator a;
reset();
BOOST_TEST(traits::select_on_container_copy_construction(a) == a);
return selected;
}
// Empty allocator test
template <typename T> struct empty_allocator
{
typedef T value_type;
ALLOCATOR_METHODS(empty_allocator)
};
void test_empty_allocator()
{
typedef empty_allocator<int> allocator;
typedef boost::unordered::detail::allocator_traits<allocator> traits;
BOOST_STATIC_ASSERT((boost::is_same<traits::size_type,
std::make_unsigned<std::ptrdiff_t>::type>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::difference_type, std::ptrdiff_t>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::pointer, int*>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::const_pointer, int const*>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::value_type, int>::value));
BOOST_TEST(!traits::propagate_on_container_copy_assignment::value);
BOOST_TEST(!traits::propagate_on_container_move_assignment::value);
BOOST_TEST(!traits::propagate_on_container_swap::value);
BOOST_TEST(traits::is_always_equal::value);
BOOST_TEST(call_select<allocator>() == 0);
}
// allocator 1
template <typename T> struct allocator1
{
typedef T value_type;
ALLOCATOR_METHODS(allocator1)
typedef yes_type propagate_on_container_copy_assignment;
typedef yes_type propagate_on_container_move_assignment;
typedef yes_type propagate_on_container_swap;
typedef yes_type is_always_equal;
allocator1<T> select_on_container_copy_construction() const
{
++selected;
return allocator1<T>();
}
};
void test_allocator1()
{
typedef allocator1<int> allocator;
typedef boost::unordered::detail::allocator_traits<allocator> traits;
BOOST_STATIC_ASSERT((boost::is_same<traits::size_type,
std::make_unsigned<std::ptrdiff_t>::type>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::difference_type, std::ptrdiff_t>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::pointer, int*>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::const_pointer, int const*>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::value_type, int>::value));
BOOST_TEST(traits::propagate_on_container_copy_assignment::value);
BOOST_TEST(traits::propagate_on_container_move_assignment::value);
BOOST_TEST(traits::propagate_on_container_swap::value);
BOOST_TEST(traits::is_always_equal::value);
BOOST_TEST(call_select<allocator>() == 1);
}
// allocator 2
template <typename Alloc> struct allocator2_base
{
Alloc select_on_container_copy_construction() const
{
++selected;
return Alloc();
}
};
template <typename T> struct allocator2 : allocator2_base<allocator2<T> >
{
typedef T value_type;
typedef T* pointer;
typedef T const* const_pointer;
typedef std::size_t size_type;
ALLOCATOR_METHODS(allocator2)
typedef no_type propagate_on_container_copy_assignment;
typedef no_type propagate_on_container_move_assignment;
typedef no_type propagate_on_container_swap;
typedef no_type is_always_equal;
};
void test_allocator2()
{
typedef allocator2<int> allocator;
typedef boost::unordered::detail::allocator_traits<allocator> traits;
BOOST_STATIC_ASSERT((boost::is_same<traits::size_type, std::size_t>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::difference_type, std::ptrdiff_t>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::pointer, int*>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::const_pointer, int const*>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::value_type, int>::value));
BOOST_TEST(!traits::propagate_on_container_copy_assignment::value);
BOOST_TEST(!traits::propagate_on_container_move_assignment::value);
BOOST_TEST(!traits::propagate_on_container_swap::value);
BOOST_TEST(!traits::is_always_equal::value);
BOOST_TEST(call_select<allocator>() == 1);
}
// allocator 3
template <typename T> struct ptr
{
T* value_;
ptr(void* v) : value_((T*)v) {}
T& operator*() const { return *value_; }
};
template <> struct ptr<void>
{
void* value_;
ptr(void* v) : value_(v) {}
};
template <> struct ptr<const void>
{
void const* value_;
ptr(void const* v) : value_(v) {}
};
template <typename T> struct allocator3
{
typedef T value_type;
typedef ptr<T> pointer;
typedef ptr<T const> const_pointer;
typedef unsigned short size_type;
int x; // Just to make it non-empty, so that is_always_equal is false.
ALLOCATOR_METHODS_TYPEDEFS(allocator3)
typedef yes_type propagate_on_container_copy_assignment;
typedef no_type propagate_on_container_move_assignment;
allocator3<T> select_on_container_copy_construction() const
{
++selected;
allocator3<T> a;
a.x = 0;
return a;
}
};
void test_allocator3()
{
typedef allocator3<int> allocator;
typedef boost::unordered::detail::allocator_traits<allocator> traits;
BOOST_STATIC_ASSERT(
(boost::is_same<traits::size_type, unsigned short>::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::difference_type, std::ptrdiff_t>::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::pointer, ptr<int> >::value));
BOOST_STATIC_ASSERT(
(boost::is_same<traits::const_pointer, ptr<int const> >::value));
BOOST_STATIC_ASSERT((boost::is_same<traits::value_type, int>::value));
BOOST_TEST(traits::propagate_on_container_copy_assignment::value);
BOOST_TEST(!traits::propagate_on_container_move_assignment::value);
BOOST_TEST(!traits::propagate_on_container_swap::value);
BOOST_TEST(!traits::is_always_equal::value);
BOOST_TEST(call_select<allocator>() == 1);
}
int main()
{
test_empty_allocator();
test_allocator1();
test_allocator2();
test_allocator3();
return boost::report_errors();
}