blob: bc870015188afc3ec24903d483d5334b972aa5b3 [file] [log] [blame]
// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <type_traits>
#include <vector>
namespace hermes_internal {
template <typename... Ts>
struct make_void {
typedef void type;
template <typename... Ts>
using void_t = typename make_void<Ts...>::type;
template <typename T>
struct is_array : std::false_type {};
template <typename T, std::size_t N>
struct is_array<std::array<T, N>> : std::true_type {};
template <typename T>
struct is_vector : std::false_type {};
template <typename T, typename Allocator>
struct is_vector<std::vector<T, Allocator>> : std::true_type {};
template <typename, typename = void>
struct is_iterator : std::false_type {};
template <typename T>
struct is_iterator<T,
void_t<typename std::iterator_traits<T>::iterator_category>>
: std::true_type {};
} // namespace hermes_internal
namespace hermes {
template <typename E>
constexpr auto to_underlying(E e) noexcept {
return static_cast<std::underlying_type_t<E>>(e);
template <typename T, typename ReturnType>
using EnableIfArrayOrVector_t =
std::enable_if_t<hermes_internal::is_vector<T>::value ||
template <typename T, typename ReturnType>
using EnableIfIterator_t =
std::enable_if_t<hermes_internal::is_iterator<T>::value, ReturnType>;
} // namespace hermes