Initial Course

modules/13_cpp23/include/expected.hpp

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+#pragma once
+
+#include <expected>
+#include <string>
+
+namespace cpp23 {
+
+enum class ParseError { EmptyInput, InvalidNumber };
+
+[[nodiscard]] auto parse_int(const std::string& text) -> std::expected<int, ParseError>;
+[[nodiscard]] auto safe_sqrt(int value) -> std::expected<double, std::string>;
+[[nodiscard]] auto chain_parse_and_double(const std::string& text) -> std::expected<int, ParseError>;
+
+}  // namespace cpp23