1// Copyright Kevlin Henney, 2000-2005.
2// Copyright Alexander Nasonov, 2006-2010.
3// Copyright Antony Polukhin, 2011-2024.
4//
5// Distributed under the Boost Software License, Version 1.0. (See
6// accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8//
9// what: lexical_cast custom keyword cast
10// who: contributed by Kevlin Henney,
11// enhanced with contributions from Terje Slettebo,
12// with additional fixes and suggestions from Gennaro Prota,
13// Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
14// Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
15// Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
16// when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
17
18#ifndef BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
19#define BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
20
21#include <boost/config.hpp>
22#ifdef BOOST_HAS_PRAGMA_ONCE
23# pragma once
24#endif
25
26#include <exception>
27#include <typeinfo>
28#include <boost/throw_exception.hpp>
29
30namespace boost
31{
32 // exception used to indicate runtime lexical_cast failure
33 class BOOST_SYMBOL_VISIBLE bad_lexical_cast :
34 // workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
35#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
36 public std::exception
37#else
38 public std::bad_cast
39#endif
40 {
41 public:
42 bad_lexical_cast() noexcept
43#ifndef BOOST_NO_TYPEID
44 : source(&typeid(void)), target(&typeid(void))
45#endif
46 {}
47
48 const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
49 return "bad lexical cast: "
50 "source type value could not be interpreted as target";
51 }
52
53 bad_lexical_cast(const bad_lexical_cast&) = default;
54 bad_lexical_cast& operator=(const bad_lexical_cast&) = default;
55
56#ifndef BOOST_NO_TYPEID
57 private:
58#ifdef BOOST_NO_STD_TYPEINFO
59 typedef ::type_info type_info_t;
60#else
61 typedef ::std::type_info type_info_t;
62#endif
63 public:
64 bad_lexical_cast(
65 const type_info_t &source_type_arg,
66 const type_info_t &target_type_arg) noexcept
67 : source(&source_type_arg), target(&target_type_arg)
68 {}
69
70 const type_info_t &source_type() const noexcept {
71 return *source;
72 }
73
74 const type_info_t &target_type() const noexcept {
75 return *target;
76 }
77
78 private:
79 const type_info_t *source;
80 const type_info_t *target;
81#endif
82 };
83
84 namespace conversion { namespace detail {
85#ifdef BOOST_NO_TYPEID
86 template <class S, class T>
87 inline void throw_bad_cast() {
88 boost::throw_exception(bad_lexical_cast());
89 }
90#else
91 template <class S, class T>
92 inline void throw_bad_cast() {
93 boost::throw_exception(e: bad_lexical_cast(typeid(S), typeid(T)));
94 }
95#endif
96 }} // namespace conversion::detail
97
98} // namespace boost
99
100#endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
101

source code of boost/libs/lexical_cast/include/boost/lexical_cast/bad_lexical_cast.hpp