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- #include <charconv>
- #include <iostream>
- #include <string>
- #include <string_view>
- int main()
- {
- std::string string = "6.5";
- std::string_view view{ string };
- int result;
- const auto input_begin = view.data();
- const auto input_end = view.data() + view.size();
- const auto conversion_result = std::from_chars(input_begin, input_end, result);
- //ptr не указывает на конец input - значит в строке что-то осталось.
- if (conversion_result.ec == std::errc::invalid_argument || conversion_result.ptr != input_end)
- {
- std::cout << "Error: " << conversion_result.ptr << std::endl;
- }
- else
- {
- std::cout << "Ok: " << conversion_result.ptr << std::endl;
- }
- return 0;
- }
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