mirror of
https://github.com/XRPLF/rippled.git
synced 2025-11-19 18:45:52 +00:00
ce8f56727e
* Better include path support in the VSProject scons tool. * Various manual fixes to include paths.
170 lines
4.3 KiB
C++
170 lines
4.3 KiB
C++
//------------------------------------------------------------------------------
|
|
/*
|
|
This file is part of Beast: https://github.com/vinniefalco/Beast
|
|
Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
|
|
|
|
Permission to use, copy, modify, and/or distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
//==============================================================================
|
|
|
|
#ifndef BEAST_CXX14_UTILITY_H_INCLUDED
|
|
#define BEAST_CXX14_UTILITY_H_INCLUDED
|
|
|
|
#include <beast/cxx14/config.h>
|
|
|
|
#include <cstddef>
|
|
#include <type_traits>
|
|
#include <utility>
|
|
|
|
namespace std {
|
|
|
|
template <class T, T... Ints>
|
|
struct integer_sequence
|
|
{
|
|
typedef T value_type;
|
|
static_assert (is_integral<T>::value,
|
|
"std::integer_sequence can only be instantiated with an integral type" );
|
|
|
|
static const size_t static_size = sizeof...(Ints);
|
|
|
|
static /* constexpr */ size_t size() /* noexcept */
|
|
{
|
|
return sizeof...(Ints);
|
|
}
|
|
};
|
|
|
|
template <size_t... Ints>
|
|
using index_sequence = integer_sequence <size_t, Ints...>;
|
|
|
|
namespace detail {
|
|
|
|
// This workaround is needed for msvc broken sizeof...
|
|
template <class... Args>
|
|
struct sizeof_workaround
|
|
{
|
|
static size_t const size = sizeof... (Args);
|
|
};
|
|
|
|
} // detail
|
|
|
|
#ifdef _MSC_VER
|
|
|
|
// This implementation compiles on MSVC and clang but not gcc
|
|
|
|
namespace detail {
|
|
|
|
template <class T, unsigned long long N, class Seq>
|
|
struct make_integer_sequence_unchecked;
|
|
|
|
template <class T, unsigned long long N, unsigned long long ...Indices>
|
|
struct make_integer_sequence_unchecked <
|
|
T, N, integer_sequence <T, Indices...>>
|
|
{
|
|
typedef typename make_integer_sequence_unchecked<
|
|
T, N-1, integer_sequence<T, N-1, Indices...>>::type type;
|
|
};
|
|
|
|
template <class T, unsigned long long ...Indices>
|
|
struct make_integer_sequence_unchecked <
|
|
T, 0, integer_sequence<T, Indices...>>
|
|
{
|
|
typedef integer_sequence <T, Indices...> type;
|
|
};
|
|
|
|
template <class T, T N>
|
|
struct make_integer_sequence_checked
|
|
{
|
|
static_assert (is_integral <T>::value,
|
|
"T must be an integral type");
|
|
|
|
static_assert (N >= 0,
|
|
"N must be non-negative");
|
|
|
|
typedef typename make_integer_sequence_unchecked <
|
|
T, N, integer_sequence<T>>::type type;
|
|
};
|
|
|
|
} // detail
|
|
|
|
template <class T, T N>
|
|
using make_integer_sequence =
|
|
typename detail::make_integer_sequence_checked <T, N>::type;
|
|
|
|
template <size_t N>
|
|
using make_index_sequence = make_integer_sequence <size_t, N>;
|
|
|
|
template <class... Args>
|
|
using index_sequence_for =
|
|
make_index_sequence <detail::sizeof_workaround <Args...>::size>;
|
|
|
|
#else
|
|
|
|
// This implementation compiles on gcc but not MSVC
|
|
|
|
namespace detail {
|
|
|
|
template <size_t... Ints>
|
|
struct index_tuple
|
|
{
|
|
typedef index_tuple <Ints..., sizeof... (Ints)> next;
|
|
|
|
};
|
|
|
|
template <size_t N>
|
|
struct build_index_tuple
|
|
{
|
|
typedef typename build_index_tuple <N-1>::type::next type;
|
|
};
|
|
|
|
template <>
|
|
struct build_index_tuple <0>
|
|
{
|
|
typedef index_tuple<> type;
|
|
};
|
|
|
|
template <class T, T N,
|
|
class Seq = typename build_index_tuple <N>::type
|
|
>
|
|
struct make_integer_sequence;
|
|
|
|
template <class T, T N, size_t... Ints>
|
|
struct make_integer_sequence <T, N, index_tuple <Ints...>>
|
|
{
|
|
static_assert (is_integral <T>::value,
|
|
"T must be an integral type");
|
|
|
|
static_assert (N >= 0,
|
|
"N must be non-negative");
|
|
|
|
typedef integer_sequence <T, static_cast <T> (Ints)...> type;
|
|
};
|
|
|
|
} // detail
|
|
|
|
template <class T, T N>
|
|
using make_integer_sequence =
|
|
typename detail::make_integer_sequence <T, N>::type;
|
|
|
|
template <size_t N>
|
|
using make_index_sequence = make_integer_sequence <size_t, N>;
|
|
|
|
template <class... Args>
|
|
using index_sequence_for =
|
|
make_index_sequence <detail::sizeof_workaround <Args...>::size>;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
#endif
|