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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifdef HAVE_CPP_STDLIB
# include "opentelemetry/std/utility.h"
#else
# include <cstddef>
# include <initializer_list>
# include <type_traits>
# include "opentelemetry/nostd/detail/decay.h"
# include "opentelemetry/nostd/detail/invoke.h"
# include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace nostd
{
/**
* Back port of std::data
*
* See https://en.cppreference.com/w/cpp/iterator/data
*/
template <class C>
auto data(C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
{
return c.data();
}
template <class C>
auto data(const C &c) noexcept(noexcept(c.data())) -> decltype(c.data())
{
return c.data();
}
template <class T, size_t N>
T *data(T (&array)[N]) noexcept
{
return array;
}
template <class E>
const E *data(std::initializer_list<E> list) noexcept
{
return list.begin();
}
/**
* Back port of std::size
*
* See https://en.cppreference.com/w/cpp/iterator/size
*/
template <class C>
auto size(const C &c) noexcept(noexcept(c.size())) -> decltype(c.size())
{
return c.size();
}
template <class T, size_t N>
size_t size(T (&array)[N]) noexcept
{
return N;
}
/**
* Back port of std::bool_constant
*/
template <bool B>
using bool_constant = std::integral_constant<bool, B>;
/**
* Back port of std::integer_sequence
*/
template <typename T, T... Is>
struct integer_sequence
{
using value_type = T;
static constexpr std::size_t size() noexcept { return sizeof...(Is); }
};
/**
* Back port of std::index_sequence
*/
template <std::size_t... Is>
using index_sequence = integer_sequence<std::size_t, Is...>;
/**
* Back port of std::make_index_sequence
*/
namespace detail
{
template <class, size_t>
struct index_sequence_push_back
{};
template <size_t... Indexes, size_t I>
struct index_sequence_push_back<index_sequence<Indexes...>, I>
{
using type = index_sequence<Indexes..., I>;
};
template <class T, size_t I>
using index_sequence_push_back_t = typename index_sequence_push_back<T, I>::type;
template <size_t N>
struct make_index_sequence_impl
{
using type = index_sequence_push_back_t<typename make_index_sequence_impl<N - 1>::type, N - 1>;
};
template <>
struct make_index_sequence_impl<0>
{
using type = index_sequence<>;
};
} // namespace detail
template <size_t N>
using make_index_sequence = typename detail::make_index_sequence_impl<N>::type;
/**
* Back port of std::index_sequence_for
*/
template <class... Ts>
using index_sequence_for = make_index_sequence<sizeof...(Ts)>;
/**
* Back port of std::in_place_t
*/
struct in_place_t
{
explicit in_place_t() = default;
};
/**
* Back port of std::in_place_index_t
*/
template <std::size_t I>
struct in_place_index_t
{
explicit in_place_index_t() = default;
};
/**
* Back port of std::in_place_type_t
*/
template <typename T>
struct in_place_type_t
{
explicit in_place_type_t() = default;
};
} // namespace nostd
OPENTELEMETRY_END_NAMESPACE
#endif
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