comparison DEPENDENCIES/generic/include/boost/cast.hpp @ 101:c530137014c0

Update Boost headers (1.58.0)
author Chris Cannam
date Mon, 07 Sep 2015 11:12:49 +0100
parents 2665513ce2d3
children
comparison
equal deleted inserted replaced
100:793467b5e61c 101:c530137014c0
1 // boost cast.hpp header file ----------------------------------------------// 1 // boost cast.hpp header file
2 2 //
3 // (C) Copyright Kevlin Henney and Dave Abrahams 1999. 3 // (C) Copyright Antony Polukhin 2014.
4 //
4 // Distributed under the Boost 5 // Distributed under the Boost
5 // Software License, Version 1.0. (See accompanying file 6 // Software License, Version 1.0. (See accompanying file
6 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 7 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 8 //
8 // See http://www.boost.org/libs/conversion for Documentation. 9 // See http://www.boost.org/libs/conversion for Documentation.
9 10
10 // Revision History 11 // This is a DEPRECATED header file!
11 // 23 JUn 05 numeric_cast removed and redirected to the new verion (Fernando Cacciola) 12 // Use <boost/polymorphic_cast.hpp> or <boost/numeric/conversion/cast.hpp> instead
12 // 02 Apr 01 Removed BOOST_NO_LIMITS workarounds and included
13 // <boost/limits.hpp> instead (the workaround did not
14 // actually compile when BOOST_NO_LIMITS was defined in
15 // any case, so we loose nothing). (John Maddock)
16 // 21 Jan 01 Undid a bug I introduced yesterday. numeric_cast<> never
17 // worked with stock GCC; trying to get it to do that broke
18 // vc-stlport.
19 // 20 Jan 01 Moved BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS to config.hpp.
20 // Removed unused BOOST_EXPLICIT_TARGET macro. Moved
21 // boost::detail::type to boost/type.hpp. Made it compile with
22 // stock gcc again (Dave Abrahams)
23 // 29 Nov 00 Remove nested namespace cast, cleanup spacing before Formal
24 // Review (Beman Dawes)
25 // 19 Oct 00 Fix numeric_cast for floating-point types (Dave Abrahams)
26 // 15 Jul 00 Suppress numeric_cast warnings for GCC, Borland and MSVC
27 // (Dave Abrahams)
28 // 30 Jun 00 More MSVC6 wordarounds. See comments below. (Dave Abrahams)
29 // 28 Jun 00 Removed implicit_cast<>. See comment below. (Beman Dawes)
30 // 27 Jun 00 More MSVC6 workarounds
31 // 15 Jun 00 Add workarounds for MSVC6
32 // 2 Feb 00 Remove bad_numeric_cast ";" syntax error (Doncho Angelov)
33 // 26 Jan 00 Add missing throw() to bad_numeric_cast::what(0 (Adam Levar)
34 // 29 Dec 99 Change using declarations so usages in other namespaces work
35 // correctly (Dave Abrahams)
36 // 23 Sep 99 Change polymorphic_downcast assert to also detect M.I. errors
37 // as suggested Darin Adler and improved by Valentin Bonnard.
38 // 2 Sep 99 Remove controversial asserts, simplify, rename.
39 // 30 Aug 99 Move to cast.hpp, replace value_cast with numeric_cast,
40 // place in nested namespace.
41 // 3 Aug 99 Initial version
42 13
43 #ifndef BOOST_CAST_HPP 14 #ifndef BOOST_CAST_HPP
44 #define BOOST_CAST_HPP 15 #define BOOST_CAST_HPP
45 16
46 # include <boost/config.hpp> 17 # include <boost/polymorphic_cast.hpp>
47 # include <boost/assert.hpp>
48 # include <typeinfo>
49 # include <boost/type.hpp>
50 # include <boost/limits.hpp>
51 # include <boost/detail/select_type.hpp>
52
53 // It has been demonstrated numerous times that MSVC 6.0 fails silently at link
54 // time if you use a template function which has template parameters that don't
55 // appear in the function's argument list.
56 //
57 // TODO: Add this to config.hpp?
58 # if defined(BOOST_MSVC) && BOOST_MSVC < 1300
59 # define BOOST_EXPLICIT_DEFAULT_TARGET , ::boost::type<Target>* = 0
60 # else
61 # define BOOST_EXPLICIT_DEFAULT_TARGET
62 # endif
63
64 namespace boost
65 {
66 // See the documentation for descriptions of how to choose between
67 // static_cast<>, dynamic_cast<>, polymorphic_cast<> and polymorphic_downcast<>
68
69 // polymorphic_cast --------------------------------------------------------//
70
71 // Runtime checked polymorphic downcasts and crosscasts.
72 // Suggested in The C++ Programming Language, 3rd Ed, Bjarne Stroustrup,
73 // section 15.8 exercise 1, page 425.
74
75 template <class Target, class Source>
76 inline Target polymorphic_cast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
77 {
78 Target tmp = dynamic_cast<Target>(x);
79 if ( tmp == 0 ) throw std::bad_cast();
80 return tmp;
81 }
82
83 // polymorphic_downcast ----------------------------------------------------//
84
85 // BOOST_ASSERT() checked polymorphic downcast. Crosscasts prohibited.
86
87 // WARNING: Because this cast uses BOOST_ASSERT(), it violates
88 // the One Definition Rule if used in multiple translation units
89 // where BOOST_DISABLE_ASSERTS, BOOST_ENABLE_ASSERT_HANDLER
90 // NDEBUG are defined inconsistently.
91
92 // Contributed by Dave Abrahams
93
94 template <class Target, class Source>
95 inline Target polymorphic_downcast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
96 {
97 BOOST_ASSERT( dynamic_cast<Target>(x) == x ); // detect logic error
98 return static_cast<Target>(x);
99 }
100
101 # undef BOOST_EXPLICIT_DEFAULT_TARGET
102
103 } // namespace boost
104
105 # include <boost/numeric/conversion/cast.hpp> 18 # include <boost/numeric/conversion/cast.hpp>
106 19
107 #endif // BOOST_CAST_HPP 20 #endif // BOOST_CAST_HPP