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C14 : add sequence.

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correct seq gcc code inclusion
This commit is contained in:
Olivier Parcollet 2014-06-03 17:16:24 +02:00
parent 6e987f4563
commit 8cf7465114
1 changed files with 65 additions and 1 deletions
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66
triqs/utility/c14.hpp
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@ -23,7 +23,8 @@
#include <functional>
#include "./macros.hpp"
// a few that will be C++14, use in advance....
// backward compat. C++11 compilers.
// new stuff in
namespace std {
namespace c14 {
@ -60,6 +61,69 @@ namespace std {
template<typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args) { return std::unique_ptr<T>(new T(std::forward<Args>(args)...)); }
//------------------------------------------------------------------------------------------
//
// sequence from C++14 : from gcc lib 4.9
/// Class template integer_sequence
// Stores a tuple of indices. Used by tuple and pair, and by bind() to
// extract the elements in a tuple.
template<size_t... _Indexes>
struct _Index_tuple
{
typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next;
};
// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
template<size_t _Num>
struct _Build_index_tuple
{
typedef typename _Build_index_tuple<_Num - 1>::__type::__next __type;
};
template<>
struct _Build_index_tuple<0>
{
typedef _Index_tuple<> __type;
};
template<typename _Tp, _Tp... _Idx>
struct integer_sequence
{
typedef _Tp value_type;
static constexpr size_t size() { return sizeof...(_Idx); }
};
template<typename _Tp, _Tp _Num,
typename _ISeq = typename _Build_index_tuple<_Num>::__type>
struct _Make_integer_sequence;
template<typename _Tp, _Tp _Num, size_t... _Idx>
struct _Make_integer_sequence<_Tp, _Num, _Index_tuple<_Idx...>>
{
static_assert( _Num >= 0,
"Cannot make integer sequence of negative length" );
typedef integer_sequence<_Tp, static_cast<_Tp>(_Idx)...> __type;
};
/// Alias template make_integer_sequence
template<typename _Tp, _Tp _Num>
using make_integer_sequence
= typename _Make_integer_sequence<_Tp, _Num>::__type;
/// Alias template index_sequence
template<size_t... _Idx>
using index_sequence = integer_sequence<size_t, _Idx...>;
/// Alias template make_index_sequence
template<size_t _Num>
using make_index_sequence = make_integer_sequence<size_t, _Num>;
/// Alias template index_sequence_for
template<typename... _Types>
using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
//--------------------------------------------------
}
}