util/NumberParser: new library based on std::from_chars()
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src/util/NumberParser.hxx
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30
src/util/NumberParser.hxx
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// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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#pragma once
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#include <charconv>
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#include <concepts>
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#include <optional>
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#include <string_view>
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template<std::integral T>
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[[gnu::pure]]
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std::optional<T>
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ParseInteger(const char *first, const char *last, int base=10) noexcept
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{
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T value;
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auto [ptr, ec] = std::from_chars(first, last, value, base);
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if (ptr == last && ec == std::errc{})
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return value;
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else
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return std::nullopt;
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}
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template<std::integral T>
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[[gnu::pure]]
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std::optional<T>
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ParseInteger(std::string_view src, int base=10) noexcept
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{
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return ParseInteger<T>(src.data(), src.data() + src.size(), base);
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}
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