1// Copyright Kevlin Henney, 2000-2005.
2// Copyright Alexander Nasonov, 2006-2010.
3// Copyright Antony Polukhin, 2011-2020.
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#if defined(BOOST_BORLANDC) && BOOST_WORKAROUND( BOOST_BORLANDC, < 0x560 )
42 // under bcc32 5.5.1 bad_cast doesn't derive from exception
43 , public std::exception
44#endif
45
46 {
47 public:
48 bad_lexical_cast() BOOST_NOEXCEPT
49#ifndef BOOST_NO_TYPEID
50 : source(&typeid(void)), target(&typeid(void))
51#endif
52 {}
53
54 const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
55 return "bad lexical cast: "
56 "source type value could not be interpreted as target";
57 }
58
59 ~bad_lexical_cast() BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
60 {}
61
62#ifndef BOOST_NO_TYPEID
63 private:
64#ifdef BOOST_NO_STD_TYPEINFO
65 typedef ::type_info type_info_t;
66#else
67 typedef ::std::type_info type_info_t;
68#endif
69 public:
70 bad_lexical_cast(
71 const type_info_t &source_type_arg,
72 const type_info_t &target_type_arg) BOOST_NOEXCEPT
73 : source(&source_type_arg), target(&target_type_arg)
74 {}
75
76 const type_info_t &source_type() const BOOST_NOEXCEPT {
77 return *source;
78 }
79
80 const type_info_t &target_type() const BOOST_NOEXCEPT {
81 return *target;
82 }
83
84 private:
85 const type_info_t *source;
86 const type_info_t *target;
87#endif
88 };
89
90 namespace conversion { namespace detail {
91#ifdef BOOST_NO_TYPEID
92 template <class S, class T>
93 inline void throw_bad_cast() {
94 boost::throw_exception(bad_lexical_cast());
95 }
96#else
97 template <class S, class T>
98 inline void throw_bad_cast() {
99 boost::throw_exception(e: bad_lexical_cast(typeid(S), typeid(T)));
100 }
101#endif
102 }} // namespace conversion::detail
103
104} // namespace boost
105
106#endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
107

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