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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
* Copyright (c) 2015 ngttp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef TEMPLATE_H
#define TEMPLATE_H
#include <functional>
#include <utility>
#include <type_traits>
#include <span>
template <std::integral T>
[[nodiscard]] constexpr auto as_unsigned(T n) noexcept {
return static_cast<std::make_unsigned_t<T>>(n);
}
template <std::unsigned_integral T>
[[nodiscard]] constexpr auto as_signed(T n) noexcept {
return static_cast<std::make_signed_t<T>>(n);
}
template <typename F> struct Defer {
explicit Defer(F &&f) noexcept(std::is_nothrow_constructible_v<F, F &&>)
: f(std::forward<F>(f)) {}
~Defer() { f(); }
Defer(Defer &&o) = delete;
Defer(const Defer &) = delete;
Defer &operator=(const Defer &) = delete;
Defer &operator=(Defer &&) = delete;
F f;
};
template <typename F> [[nodiscard]] Defer<std::decay_t<F>> defer(F &&f) {
return Defer<std::decay_t<F>>(std::forward<F>(f));
}
template <typename T, size_t N> constexpr size_t array_size(T (&)[N]) {
return N;
}
template <typename T, size_t N> constexpr size_t str_size(T (&)[N]) {
return N - 1;
}
// User-defined literals for K, M, and G (powers of 1024)
constexpr unsigned long long operator""_k(unsigned long long k) {
return k * 1024;
}
constexpr unsigned long long operator""_m(unsigned long long m) {
return m * 1024 * 1024;
}
constexpr unsigned long long operator""_g(unsigned long long g) {
return g * 1024 * 1024 * 1024;
}
template <typename T, std::size_t N>
[[nodiscard]] std::span<uint8_t, N == std::dynamic_extent ? std::dynamic_extent
: N * sizeof(T)>
as_writable_uint8_span(std::span<T, N> s) noexcept {
return std::span<uint8_t, N == std::dynamic_extent ? std::dynamic_extent
: N * sizeof(T)>{
reinterpret_cast<uint8_t *>(s.data()), s.size_bytes()};
}
#endif // !defined(TEMPLATE_H)
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