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include/boost/lexical_cast/bad_lexical_cast.hpp

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+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2025.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
+#define BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <exception>
+#include <typeinfo>
+#include <boost/throw_exception.hpp>
+
+namespace boost
+{
+    // exception used to indicate runtime lexical_cast failure
+    class BOOST_SYMBOL_VISIBLE bad_lexical_cast :
+    // workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
+#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
+        public std::exception
+#else
+        public std::bad_cast
+#endif
+    {
+    public:
+        bad_lexical_cast() noexcept
+#ifndef BOOST_NO_TYPEID
+           : source(&typeid(void)), target(&typeid(void))
+#endif
+        {}
+
+        const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
+            return "bad lexical cast: "
+                   "source type value could not be interpreted as target";
+        }
+
+        bad_lexical_cast(const bad_lexical_cast&) = default;
+        bad_lexical_cast& operator=(const bad_lexical_cast&) = default;
+
+#ifndef BOOST_NO_TYPEID
+    private:
+#ifdef BOOST_NO_STD_TYPEINFO
+        typedef ::type_info type_info_t;
+#else
+        typedef ::std::type_info type_info_t;
+#endif
+    public:
+        bad_lexical_cast(
+                const type_info_t &source_type_arg,
+                const type_info_t &target_type_arg) noexcept
+            : source(&source_type_arg), target(&target_type_arg)
+        {}
+
+        const type_info_t &source_type() const noexcept {
+            return *source;
+        }
+
+        const type_info_t &target_type() const noexcept {
+            return *target;
+        }
+
+    private:
+        const type_info_t *source;
+        const type_info_t *target;
+#endif
+    };
+
+    namespace conversion { namespace detail {
+#ifdef BOOST_NO_TYPEID
+        template <class S, class T>
+        inline void throw_bad_cast() {
+            boost::throw_exception(bad_lexical_cast());
+        }
+#else
+        template <class S, class T>
+        inline void throw_bad_cast() {
+            boost::throw_exception(bad_lexical_cast(typeid(S), typeid(T)));
+        }
+#endif
+    }} // namespace conversion::detail
+
+} // namespace boost
+
+#endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP