68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
#pragma once
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#include "StarFormat.hpp"
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#include "StarString.hpp"
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#include "StarStringView.hpp"
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#include "StarMaybe.hpp"
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#include "fast_float.h"
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namespace Star {
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STAR_EXCEPTION(BadLexicalCast, StarException);
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void throwLexicalCastError(std::errc ec, const char* first, const char* last);
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template <typename Type>
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bool tryLexicalCast(Type& result, const char* first, const char* last) {
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auto res = fast_float::from_chars(first, last, result);
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return res.ptr == last && (res.ec == std::errc() || res.ec == std::errc::result_out_of_range);
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}
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template <>
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bool tryLexicalCast(bool& result, const char* first, const char* last);
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template <typename Type>
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bool tryLexicalCast(Type& result, String const& s) {
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return tryLexicalCast<Type>(result, s.utf8Ptr(), s.utf8Ptr() + s.utf8Size());
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}
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template <typename Type>
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bool tryLexicalCast(Type& result, StringView s) {
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return tryLexicalCast<Type>(result, s.utf8Ptr(), s.utf8Ptr() + s.utf8Size());
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}
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template <typename Type>
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Maybe<Type> maybeLexicalCast(const char* first, const char* last) {
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Type result{};
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if (tryLexicalCast(result, first, last))
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return result;
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else
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return {};
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}
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template <typename Type>
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Maybe<Type> maybeLexicalCast(StringView s) {
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return maybeLexicalCast<Type>(s.utf8Ptr(), s.utf8Ptr() + s.utf8Size());
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}
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template <typename Type>
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Type lexicalCast(const char* first, const char* last) {
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Type result{};
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auto res = fast_float::from_chars(first, last, result);
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if ((res.ec != std::errc() && res.ec != std::errc::result_out_of_range) || res.ptr != last)
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throwLexicalCastError(res.ec, first, last);
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return result;
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}
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template <>
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bool lexicalCast(const char* first, const char* last);
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template <typename Type>
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Type lexicalCast(StringView s) {
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return lexicalCast<Type>(s.utf8Ptr(), s.utf8Ptr() + s.utf8Size());
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}
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}
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