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35 lines
959 B
35 lines
959 B
#pragma once |
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#include <charconv> |
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#include <string_view> |
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#include <system_error> |
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#include <expected.hpp> |
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namespace devilution { |
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enum class ParseIntError { |
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ParseError = 1, |
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OutOfRange |
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}; |
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template <typename IntT> |
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using ParseIntResult = tl::expected<IntT, ParseIntError>; |
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template <typename IntT> |
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ParseIntResult<IntT> ParseInt( |
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std::string_view str, IntT min = std::numeric_limits<IntT>::min(), |
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IntT max = std::numeric_limits<IntT>::max()) |
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{ |
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IntT value; |
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const std::from_chars_result result = std::from_chars(str.data(), str.data() + str.size(), value); |
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if (result.ec == std::errc::invalid_argument) |
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return tl::unexpected(ParseIntError::ParseError); |
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if (result.ec == std::errc::result_out_of_range || value < min || value > max) |
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return tl::unexpected(ParseIntError::OutOfRange); |
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if (result.ec != std::errc()) |
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return tl::unexpected(ParseIntError::ParseError); |
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return value; |
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} |
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} // namespace devilution
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