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47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
/*
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* Copyright (C) 2023 Kyle Reed
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __CONVERT_H__
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#define __CONVERT_H__
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#include <charconv>
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#include <cstdlib>
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#include <string>
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#include <string_view>
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#include <type_traits>
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/* Zero-allocation conversion helper. */
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/* Notes:
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* - T must be an integer type.
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* - For base 16, input _must not_ contain a '0x' or '0X' prefix.
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* - For base 8 a leading 0 on the literal is allowed.
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* - Leading whitespce will cause the parse to fail.
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*/
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// TODO: from_chars seems to cause code bloat.
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// Look into using strtol and friends instead.
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template <typename T>
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std::enable_if_t<std::is_integral_v<T>, bool> parse_int(std::string_view str, T& out_val, int base = 10) {
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auto result = std::from_chars(str.data(), str.data() + str.length(), out_val, base);
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return static_cast<int>(result.ec) == 0;
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}
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#endif /*__CONVERT_H__*/ |