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glm/test/external/boost/unordered/detail/allocator_helpers.hpp

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// Copyright 2005-2011 Daniel James.
// Copyright 2009 Pablo Halpern.
//
// 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)
//
// Allocator traits written by Daniel James based on Pablo Halpern's
// implementation.
#ifndef BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
#define BOOST_UNORDERED_DETAIL_ALLOCATOR_UTILITIES_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <boost/config.hpp>
#include <boost/detail/select_type.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/enum.hpp>
#include <boost/limits.hpp>
#include <boost/type_traits/add_lvalue_reference.hpp>
#include <boost/pointer_to_other.hpp>
#include <boost/assert.hpp>
#include <boost/utility/addressof.hpp>
#if BOOST_UNORDERED_USE_ALLOCATOR_TRAITS
# include <memory>
#endif
#if !defined(BOOST_NO_0X_HDR_TYPE_TRAITS)
# include <type_traits>
#endif
namespace boost { namespace unordered { namespace detail {
////////////////////////////////////////////////////////////////////////////
// Integral_constrant, true_type, false_type
//
// Uses the standard versions if available.
#if !defined(BOOST_NO_0X_HDR_TYPE_TRAITS)
using std::integral_constant;
using std::true_type;
using std::false_type;
#else
template <typename T, T Value>
struct integral_constant { enum { value = Value }; };
typedef boost::unordered::detail::integral_constant<bool, true> true_type;
typedef boost::unordered::detail::integral_constant<bool, false> false_type;
#endif
////////////////////////////////////////////////////////////////////////////
// Explicitly call a destructor
#if defined(BOOST_MSVC)
#pragma warning(push)
#pragma warning(disable:4100) // unreferenced formal parameter
#endif
template <class T>
inline void destroy(T* x) {
x->~T();
}
#if defined(BOOST_MSVC)
#pragma warning(pop)
#endif
////////////////////////////////////////////////////////////////////////////
// Bits and pieces for implementing traits
//
// Some of these are also used elsewhere
template <typename T> typename boost::add_lvalue_reference<T>::type make();
struct choice9 { typedef char (&type)[9]; };
struct choice8 : choice9 { typedef char (&type)[8]; };
struct choice7 : choice8 { typedef char (&type)[7]; };
struct choice6 : choice7 { typedef char (&type)[6]; };
struct choice5 : choice6 { typedef char (&type)[5]; };
struct choice4 : choice5 { typedef char (&type)[4]; };
struct choice3 : choice4 { typedef char (&type)[3]; };
struct choice2 : choice3 { typedef char (&type)[2]; };
struct choice1 : choice2 { typedef char (&type)[1]; };
choice1 choose();
typedef choice1::type yes_type;
typedef choice2::type no_type;
struct private_type
{
private_type const &operator,(int) const;
};
template <typename T>
no_type is_private_type(T const&);
yes_type is_private_type(private_type const&);
struct convert_from_anything {
template <typename T>
convert_from_anything(T const&);
};
#if !defined(BOOST_NO_SFINAE_EXPR)
# define BOOST_UNORDERED_HAVE_CALL_DETECTION 1
template <typename T, unsigned int> struct expr_test;
template <typename T> struct expr_test<T, sizeof(char)> : T {};
template <typename U> static char for_expr_test(U const&);
#define BOOST_UNORDERED_CHECK_EXPRESSION(count, result, expression) \
template <typename U> \
static typename boost::unordered::detail::expr_test< \
BOOST_PP_CAT(choice, result), \
sizeof(boost::unordered::detail::for_expr_test(( \
(expression), \
0)))>::type test( \
BOOST_PP_CAT(choice, count))
#define BOOST_UNORDERED_DEFAULT_EXPRESSION(count, result) \
template <typename U> \
static BOOST_PP_CAT(choice, result)::type test( \
BOOST_PP_CAT(choice, count))
#define BOOST_UNORDERED_HAS_FUNCTION(name, thing, args, _) \
struct BOOST_PP_CAT(has_, name) \
{ \
BOOST_UNORDERED_CHECK_EXPRESSION(1, 1, \
boost::unordered::detail::make< thing >().name args); \
BOOST_UNORDERED_DEFAULT_EXPRESSION(2, 2); \
\
enum { value = sizeof(test<T>(choose())) == sizeof(choice1::type) };\
}
#else
# define BOOST_UNORDERED_HAVE_CALL_DETECTION 0
template <typename T> struct identity { typedef T type; };
#define BOOST_UNORDERED_CHECK_MEMBER(count, result, name, member) \
\
typedef typename boost::unordered::detail::identity<member>::type \
BOOST_PP_CAT(check, count); \
\
template <BOOST_PP_CAT(check, count) e> \
struct BOOST_PP_CAT(test, count) { \
typedef BOOST_PP_CAT(choice, result) type; \
}; \
\
template <class U> static typename \
BOOST_PP_CAT(test, count)<&U::name>::type \
test(BOOST_PP_CAT(choice, count))
#define BOOST_UNORDERED_DEFAULT_MEMBER(count, result) \
template <class U> static BOOST_PP_CAT(choice, result)::type \
test(BOOST_PP_CAT(choice, count))
#define BOOST_UNORDERED_HAS_MEMBER(name) \
struct BOOST_PP_CAT(has_, name) \
{ \
struct impl { \
struct base_mixin { int name; }; \
struct base : public T, public base_mixin {}; \
\
BOOST_UNORDERED_CHECK_MEMBER(1, 1, name, int base_mixin::*); \
BOOST_UNORDERED_DEFAULT_MEMBER(2, 2); \
\
enum { value = sizeof(choice2::type) == \
sizeof(test<base>(choose())) \
}; \
}; \
\
enum { value = impl::value }; \
}
#endif
////////////////////////////////////////////////////////////////////////////
// Allocator traits
//
// Uses the standard versions if available.
// (although untested as I don't have access to a standard version yet)
#if BOOST_UNORDERED_USE_ALLOCATOR_TRAITS
template <typename Alloc>
struct allocator_traits : std::allocator_traits<Alloc> {};
template <typename Alloc, typename T>
struct rebind_wrap
{
typedef typename std::allocator_traits<Alloc>::rebind_alloc<T> type;
};
#else
// TODO: Does this match std::allocator_traits<Alloc>::rebind_alloc<T>?
template <typename Alloc, typename T>
struct rebind_wrap
{
typedef typename Alloc::BOOST_NESTED_TEMPLATE rebind<T>::other
type;
};
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1400
#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname) \
template <typename Tp, typename Default> \
struct default_type_ ## tname { \
\
template <typename X> \
static choice1::type test(choice1, typename X::tname* = 0); \
\
template <typename X> \
static choice2::type test(choice2, void* = 0); \
\
struct DefaultWrap { typedef Default tname; }; \
\
enum { value = (1 == sizeof(test<Tp>(choose()))) }; \
\
typedef typename boost::detail::if_true<value>:: \
BOOST_NESTED_TEMPLATE then<Tp, DefaultWrap> \
::type::tname type; \
}
#else
template <typename T, typename T2>
struct sfinae : T2 {};
#define BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(tname) \
template <typename Tp, typename Default> \
struct default_type_ ## tname { \
\
template <typename X> \
static typename boost::unordered::detail::sfinae< \
typename X::tname, choice1>::type \
test(choice1); \
\
template <typename X> \
static choice2::type test(choice2); \
\
struct DefaultWrap { typedef Default tname; }; \
\
enum { value = (1 == sizeof(test<Tp>(choose()))) }; \
\
typedef typename boost::detail::if_true<value>:: \
BOOST_NESTED_TEMPLATE then<Tp, DefaultWrap> \
::type::tname type; \
}
#endif
#define BOOST_UNORDERED_DEFAULT_TYPE(T,tname, arg) \
typename default_type_ ## tname<T, arg>::type
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(pointer);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(const_pointer);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(void_pointer);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(const_void_pointer);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(difference_type);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(size_type);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_copy_assignment);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_move_assignment);
BOOST_UNORDERED_DEFAULT_TYPE_TMPLT(propagate_on_container_swap);
#if BOOST_UNORDERED_HAVE_CALL_DETECTION
template <typename T>
BOOST_UNORDERED_HAS_FUNCTION(
select_on_container_copy_construction, U const, (), 0
);
template <typename T>
BOOST_UNORDERED_HAS_FUNCTION(
max_size, U const, (), 0
);
template <typename T, typename ValueType>
BOOST_UNORDERED_HAS_FUNCTION(
construct, U, (
boost::unordered::detail::make<ValueType*>(),
boost::unordered::detail::make<ValueType const>()), 2
);
template <typename T, typename ValueType>
BOOST_UNORDERED_HAS_FUNCTION(
destroy, U, (boost::unordered::detail::make<ValueType*>()), 1
);
#else
template <typename T>
BOOST_UNORDERED_HAS_MEMBER(select_on_container_copy_construction);
template <typename T>
BOOST_UNORDERED_HAS_MEMBER(max_size);
template <typename T, typename ValueType>
BOOST_UNORDERED_HAS_MEMBER(construct);
template <typename T, typename ValueType>
BOOST_UNORDERED_HAS_MEMBER(destroy);
#endif
template <typename Alloc>
inline typename boost::enable_if_c<
boost::unordered::detail::
has_select_on_container_copy_construction<Alloc>::value, Alloc
>::type call_select_on_container_copy_construction(const Alloc& rhs)
{
return rhs.select_on_container_copy_construction();
}
template <typename Alloc>
inline typename boost::disable_if_c<
boost::unordered::detail::
has_select_on_container_copy_construction<Alloc>::value, Alloc
>::type call_select_on_container_copy_construction(const Alloc& rhs)
{
return rhs;
}
template <typename SizeType, typename Alloc>
inline typename boost::enable_if_c<
boost::unordered::detail::has_max_size<Alloc>::value, SizeType
>::type call_max_size(const Alloc& a)
{
return a.max_size();
}
template <typename SizeType, typename Alloc>
inline typename boost::disable_if_c<
boost::unordered::detail::has_max_size<Alloc>::value, SizeType
>::type call_max_size(const Alloc&)
{
return (std::numeric_limits<SizeType>::max)();
}
template <typename Alloc>
struct allocator_traits
{
typedef Alloc allocator_type;
typedef typename Alloc::value_type value_type;
typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, pointer, value_type*)
pointer;
template <typename T>
struct pointer_to_other : boost::pointer_to_other<pointer, T> {};
typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, const_pointer,
typename pointer_to_other<const value_type>::type)
const_pointer;
//typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, void_pointer,
// typename pointer_to_other<void>::type)
// void_pointer;
//
//typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, const_void_pointer,
// typename pointer_to_other<const void>::type)
// const_void_pointer;
typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, difference_type,
std::ptrdiff_t) difference_type;
typedef BOOST_UNORDERED_DEFAULT_TYPE(Alloc, size_type, std::size_t)
size_type;
// TODO: rebind_alloc and rebind_traits
static pointer allocate(Alloc& a, size_type n)
{ return a.allocate(n); }
// I never use this, so I'll just comment it out for now.
//
//static pointer allocate(Alloc& a, size_type n,
// const_void_pointer hint)
// { return DEFAULT_FUNC(allocate, pointer)(a, n, hint); }
static void deallocate(Alloc& a, pointer p, size_type n)
{ a.deallocate(p, n); }
public:
// Only supporting the basic copy constructor for now.
template <typename T>
static typename boost::enable_if_c<
boost::unordered::detail::has_construct<Alloc, T>::value>::type
construct(Alloc& a, T* p, T const& x)
{
a.construct(p, x);
}
template <typename T>
static typename boost::disable_if_c<
boost::unordered::detail::has_construct<Alloc, T>::value>::type
construct(Alloc&, T* p, T const& x)
{
new ((void*) p) T(x);
}
template <typename T>
static typename boost::enable_if_c<
boost::unordered::detail::has_destroy<Alloc, T>::value>::type
destroy(Alloc& a, T* p)
{
a.destroy(p);
}
template <typename T>
static typename boost::disable_if_c<
boost::unordered::detail::has_destroy<Alloc, T>::value>::type
destroy(Alloc&, T* p)
{
boost::unordered::detail::destroy(p);
}
static size_type max_size(const Alloc& a)
{
return boost::unordered::detail::call_max_size<size_type>(a);
}
// Allocator propagation on construction
static Alloc select_on_container_copy_construction(Alloc const& rhs)
{
return boost::unordered::detail::
call_select_on_container_copy_construction(rhs);
}
// Allocator propagation on assignment and swap.
// Return true if lhs is modified.
typedef BOOST_UNORDERED_DEFAULT_TYPE(
Alloc, propagate_on_container_copy_assignment, false_type)
propagate_on_container_copy_assignment;
typedef BOOST_UNORDERED_DEFAULT_TYPE(
Alloc,propagate_on_container_move_assignment, false_type)
propagate_on_container_move_assignment;
typedef BOOST_UNORDERED_DEFAULT_TYPE(
Alloc,propagate_on_container_swap,false_type)
propagate_on_container_swap;
};
#undef BOOST_UNORDERED_DEFAULT_TYPE_TMPLT
#undef BOOST_UNORDERED_DEFAULT_TYPE
#endif
// array_constructor
//
// Allocate and construct an array in an exception safe manner, and
// clean up if an exception is thrown before the container takes charge
// of it.
template <typename Allocator>
struct array_constructor
{
typedef boost::unordered::detail::allocator_traits<Allocator> traits;
typedef typename traits::pointer pointer;
Allocator& alloc_;
pointer ptr_;
pointer constructed_;
std::size_t length_;
array_constructor(Allocator& a)
: alloc_(a), ptr_(), constructed_(), length_(0)
{
constructed_ = pointer();
ptr_ = pointer();
}
~array_constructor() {
if (ptr_) {
for(pointer p = ptr_; p != constructed_; ++p)
traits::destroy(alloc_, boost::addressof(*p));
traits::deallocate(alloc_, ptr_, length_);
}
}
template <typename V>
void construct(V const& v, std::size_t l)
{
BOOST_ASSERT(!ptr_);
length_ = l;
ptr_ = traits::allocate(alloc_, length_);
pointer end = ptr_ + static_cast<std::ptrdiff_t>(length_);
for(constructed_ = ptr_; constructed_ != end; ++constructed_)
traits::construct(alloc_, boost::addressof(*constructed_), v);
}
pointer get() const
{
return ptr_;
}
pointer release()
{
pointer p(ptr_);
ptr_ = pointer();
return p;
}
private:
array_constructor(array_constructor const&);
array_constructor& operator=(array_constructor const&);
};
}}}
#endif