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// Copyright (c) 2017 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAOCPP_PEGTL_INCLUDE_INTERNAL_INTEGER_SEQUENCE_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_INTEGER_SEQUENCE_HPP
#include <cstddef>
#include <type_traits>
#include <utility>
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
template< typename T, T... Ns >
struct integer_sequence
{
using value_type = T;
static constexpr std::size_t size() noexcept
{
return sizeof...( Ns );
}
};
template< std::size_t... Ns >
using index_sequence = integer_sequence< std::size_t, Ns... >;
template< typename, std::size_t, bool >
struct double_up;
template< typename T, T... Ns, std::size_t N >
struct double_up< integer_sequence< T, Ns... >, N, false >
{
using type = integer_sequence< T, Ns..., ( N + Ns )... >;
};
template< typename T, T... Ns, std::size_t N >
struct double_up< integer_sequence< T, Ns... >, N, true >
{
using type = integer_sequence< T, Ns..., ( N + Ns )..., 2 * N >;
};
template< typename T, T N, typename = void >
struct generate_sequence;
template< typename T, T N >
using generate_sequence_t = typename generate_sequence< T, N >::type;
template< typename T, T N, typename >
struct generate_sequence
: double_up< generate_sequence_t< T, N / 2 >, N / 2, N % 2 == 1 >
{
};
template< typename T, T N >
struct generate_sequence< T, N, typename std::enable_if< ( N == 0 ) >::type >
{
using type = integer_sequence< T >;
};
template< typename T, T N >
struct generate_sequence< T, N, typename std::enable_if< ( N == 1 ) >::type >
{
using type = integer_sequence< T, 0 >;
};
template< typename T, T N >
using make_integer_sequence = generate_sequence_t< T, N >;
template< std::size_t N >
using make_index_sequence = make_integer_sequence< std::size_t, N >;
template< typename... Ts >
using index_sequence_for = make_index_sequence< sizeof...( Ts ) >;
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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