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util/SpanCast: move CopyConst to separate header

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Max Kellermann 2022-06-08 20:58:22 +02:00 committed by Max Kellermann
parent 86be7938f1
commit 5d34b9b5bb
2 changed files with 42 additions and 3 deletions
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40
src/util/CopyConst.hxx Normal file
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@ -0,0 +1,40 @@
/*
* Copyright 2022 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <type_traits>
/**
* Generate a type based on #To with the same const-ness as #From.
*/
template<typename To, typename From>
using CopyConst = std::conditional_t<std::is_const_v<From>,
const To,
To>;

5
src/util/SpanCast.hxx
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@ -29,14 +29,13 @@
#pragma once
#include "CopyConst.hxx"
#include <cassert>
#include <cstddef>
#include <span>
#include <string_view>
template<typename To, typename From>
using CopyConst = std::conditional_t<std::is_const_v<From>, const To, To>;
/**
* Cast a std::span<std::byte> to a std::span<T>, rounding down to the
* next multiple of T's size.