mirror of
https://github.com/boostorg/conversion.git
synced 2026-08-06 13:34:14 +02:00
Compare commits
25 Commits
| Author | SHA1 | Date | |
|---|---|---|---|
 nobody
|
e369fda179 | ||
|
nobody
|
4e60178205 | ||
 Beman Dawes
|
9f5ec17603 | ||
 Vladimir Prus
|
575c477f54 | ||
 Dave Abrahams
|
e6c52ae0f4 | ||
|
Dave Abrahams
|
13796f3f98 | ||
|
Dave Abrahams
|
80a6db56c1 | ||
 Jens Maurer
|
25935cda40 | ||
|
Dave Abrahams
|
386d7a67d6 | ||
|
Beman Dawes
|
4b3e8171fa | ||
 Terje Slettebø
|
498c84dd4f | ||
 John Maddock
|
3ecac311fd | ||
|
Terje Slettebø
|
8828af5f5b | ||
|
Terje Slettebø
|
1937e3a12a | ||
|
Terje Slettebø
|
545687e22b | ||
|
Terje Slettebø
|
9c63f9fbd0 | ||
|
Terje Slettebø
|
9c1311a712 | ||
|
Beman Dawes
|
51395d7b26 | ||
|
Dave Abrahams
|
02609a4675 | ||
|
Dave Abrahams
|
52de514faf | ||
|
Terje Slettebø
|
ae7d610cb1 | ||
|
Terje Slettebø
|
eb9d2c02ea | ||
|
Beman Dawes
|
e2825ab729 | ||
|
Beman Dawes
|
4978f3a79f | ||
|
Beman Dawes
|
42639f120a |
@@ -1,64 +1,85 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<meta name="generator" content=
|
||||
"HTML Tidy for Cygwin (vers 1st April 2002), see www.w3.org">
|
||||
<meta http-equiv="Content-Type" content=
|
||||
"text/html; charset=windows-1252">
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
|
||||
<meta name="ProgId" content="FrontPage.Editor.Document">
|
||||
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
|
||||
<meta name="ProgId" content="FrontPage.Editor.Document">
|
||||
<title>Header boost/cast.hpp Documentation</title>
|
||||
</head>
|
||||
<title>Header boost/cast.hpp Documentation</title>
|
||||
</head>
|
||||
|
||||
<body bgcolor="#FFFFFF" text="#000000">
|
||||
<body bgcolor="#FFFFFF" text="#000000">
|
||||
<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align=
|
||||
"middle" width="277" height="86">Header <a href=
|
||||
"../../boost/cast.hpp">boost/cast.hpp</a></h1>
|
||||
|
||||
<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="middle" width="277" height="86">Header
|
||||
<a href="../../boost/cast.hpp">boost/cast.hpp</a></h1>
|
||||
<h2><a name="Cast Functions">Cast Functions</a></h2>
|
||||
|
||||
<h2><a name="Cast Functions">Cast Functions</a></h2>
|
||||
<p>The header <a href="../../boost/cast.hpp">boost/cast.hpp</a> provides
|
||||
<a href="#Polymorphic_cast"><b>polymorphic_cast</b></a>, <a href=
|
||||
"#Polymorphic_cast"><b>polymorphic_downcast</b></a>, and <a href=
|
||||
"#numeric_cast"><b>numeric_cast</b></a> function templates designed to
|
||||
complement the C++ built-in casts.</p>
|
||||
|
||||
<p>The header <a href="../../boost/cast.hpp">boost/cast.hpp</a>
|
||||
provides <a href="#Polymorphic_cast"><b>polymorphic_cast</b></a>, <a href="#Polymorphic_cast"><b>polymorphic_downcast</b></a>,
|
||||
and <a href="#numeric_cast"><b>numeric_cast</b></a> function templates designed
|
||||
to complement the C++ built-in casts.</p>
|
||||
<p>The program <a href="cast_test.cpp">cast_test.cpp</a> can be used to
|
||||
verify these function templates work as expected.</p>
|
||||
|
||||
<p>The program <a href="cast_test.cpp">cast_test.cpp</a> can be used to
|
||||
verify these function templates work as expected.</p>
|
||||
<h3><a name="Polymorphic_cast">Polymorphic casts</a></h3>
|
||||
<p>Pointers to polymorphic objects (objects of classes which define at least one
|
||||
virtual function) are sometimes downcast or crosscast. Downcasting means
|
||||
casting from a base class to a derived class. Crosscasting means casting
|
||||
across an inheritance hierarchy diagram, such as from one base to the other in a
|
||||
<b>Y</b> diagram hierarchy.</p>
|
||||
<p>Such casts can be done with old-style casts, but this approach is never to be
|
||||
recommended. Old-style casts are sorely lacking in type safety, suffer
|
||||
poor readability, and are difficult to locate with search tools.</p>
|
||||
<p>The C++ built-in <b>static_cast</b> can be used for efficiently downcasting
|
||||
pointers to polymorphic objects, but provides no error detection for the case
|
||||
where the pointer being cast actually points to the wrong derived class. The <b>polymorphic_downcast</b>
|
||||
template retains the efficiency of <b>static_cast</b> for non-debug
|
||||
compilations, but for debug compilations adds safety via an assert() that a <b>dynamic_cast</b>
|
||||
succeeds.</p>
|
||||
<p>The C++ built-in <b>dynamic_cast</b> can be used for downcasts and crosscasts
|
||||
of pointers to polymorphic objects, but error notification in the form of a
|
||||
returned value of 0 is inconvenient to test, or worse yet, easy to forget to
|
||||
test. The <b>polymorphic_cast</b> template performs a <b>dynamic_cast</b>,
|
||||
and throws an exception if the <b>dynamic_cast</b> returns 0.</p>
|
||||
<p>A <b>polymorphic_downcast</b> is preferred when debug-mode tests will cover
|
||||
100% of the object types possibly cast and when non-debug-mode efficiency is an
|
||||
issue. If these two conditions are not present, <b>polymorphic_cast</b> is
|
||||
preferred. It must also be used for crosscasts. It does an assert(
|
||||
dynamic_cast<Derived>(x) == x ) where x is the base pointer, ensuring that
|
||||
not only is a non-zero pointer returned, but also that it correct in the
|
||||
presence of multiple inheritance.<b> Warning:</b>: Because <b>polymorphic_downcast</b>
|
||||
uses assert(), it violates the one definition rule (ODR) if NDEBUG is inconsistently
|
||||
defined across translation units. [See ISO Std 3.2]</p>
|
||||
<p>The C++ built-in <b>dynamic_cast</b> must be used to cast references rather
|
||||
than pointers. It is also the only cast that can be used to check whether
|
||||
a given interface is supported; in that case a return of 0 isn't an error
|
||||
condition.</p>
|
||||
<h3>polymorphic_cast and polymorphic_downcast synopsis</h3>
|
||||
<blockquote>
|
||||
<pre>namespace boost {
|
||||
<h3><a name="Polymorphic_cast">Polymorphic casts</a></h3>
|
||||
|
||||
<p>Pointers to polymorphic objects (objects of classes which define at
|
||||
least one virtual function) are sometimes downcast or crosscast.
|
||||
Downcasting means casting from a base class to a derived class.
|
||||
Crosscasting means casting across an inheritance hierarchy diagram, such
|
||||
as from one base to the other in a <b>Y</b> diagram hierarchy.</p>
|
||||
|
||||
<p>Such casts can be done with old-style casts, but this approach is
|
||||
never to be recommended. Old-style casts are sorely lacking in type
|
||||
safety, suffer poor readability, and are difficult to locate with search
|
||||
tools.</p>
|
||||
|
||||
<p>The C++ built-in <b>static_cast</b> can be used for efficiently
|
||||
downcasting pointers to polymorphic objects, but provides no error
|
||||
detection for the case where the pointer being cast actually points to
|
||||
the wrong derived class. The <b>polymorphic_downcast</b> template retains
|
||||
the efficiency of <b>static_cast</b> for non-debug compilations, but for
|
||||
debug compilations adds safety via an assert() that a <b>dynamic_cast</b>
|
||||
succeeds.</p>
|
||||
|
||||
<p>The C++ built-in <b>dynamic_cast</b> can be used for downcasts and
|
||||
crosscasts of pointers to polymorphic objects, but error notification in
|
||||
the form of a returned value of 0 is inconvenient to test, or worse yet,
|
||||
easy to forget to test. The throwing form of <b>dynamic_cast</b>, which
|
||||
works on references, can be used on pointers through the ugly expression
|
||||
&<code>dynamic_cast<T&>(*p)</code>, which causes undefined
|
||||
behavior if <code>p</code> is <code>0</code>. The <b>polymorphic_cast</b>
|
||||
template performs a <b>dynamic_cast</b> on a pointer, and throws an
|
||||
exception if the <b>dynamic_cast</b> returns 0.</p>
|
||||
|
||||
<p>A <b>polymorphic_downcast</b> is preferred when debug-mode tests will
|
||||
cover 100% of the object types possibly cast and when non-debug-mode
|
||||
efficiency is an issue. If these two conditions are not present,
|
||||
<b>polymorphic_cast</b> is preferred. It must also be used for
|
||||
crosscasts. It does an assert( dynamic_cast<Derived>(x) == x )
|
||||
where x is the base pointer, ensuring that not only is a non-zero pointer
|
||||
returned, but also that it correct in the presence of multiple
|
||||
inheritance. <b>Warning:</b>: Because <b>polymorphic_downcast</b> uses
|
||||
assert(), it violates the one definition rule (ODR) if NDEBUG is
|
||||
inconsistently defined across translation units. [See ISO Std 3.2]</p>
|
||||
|
||||
<p>The C++ built-in <b>dynamic_cast</b> must be used to cast references
|
||||
rather than pointers. It is also the only cast that can be used to check
|
||||
whether a given interface is supported; in that case a return of 0 isn't
|
||||
an error condition.</p>
|
||||
|
||||
<h3>polymorphic_cast and polymorphic_downcast synopsis</h3>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
namespace boost {
|
||||
|
||||
template <class Derived, class Base>
|
||||
inline Derived polymorphic_cast(Base* x);
|
||||
@@ -70,11 +91,15 @@ inline Derived polymorphic_downcast(Base* x);
|
||||
// Effects: assert( dynamic_cast<Derived>(x) == x );
|
||||
// Returns: static_cast<Derived>(x)
|
||||
|
||||
}</pre>
|
||||
</blockquote>
|
||||
<h3>polymorphic_downcast example</h3>
|
||||
<blockquote>
|
||||
<pre>#include <boost/cast.hpp>
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h3>polymorphic_downcast example</h3>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
#include <boost/cast.hpp>
|
||||
...
|
||||
class Fruit { public: virtual ~Fruit(){}; ... };
|
||||
class Banana : public Fruit { ... };
|
||||
@@ -82,26 +107,40 @@ class Banana : public Fruit { ... };
|
||||
void f( Fruit * fruit ) {
|
||||
// ... logic which leads us to believe it is a Banana
|
||||
Banana * banana = boost::polymorphic_downcast<Banana*>(fruit);
|
||||
...</pre>
|
||||
</blockquote>
|
||||
<h3><a name="numeric_cast">numeric_cast</a></h3>
|
||||
<p>A <b>static_cast</b> or implicit conversion will not
|
||||
detect failure to preserve range for numeric casts. The <b>numeric_cast</b> function
|
||||
templates are similar to <b>static_cast</b> and certain (dubious)
|
||||
implicit conversions in this respect, except that they detect loss of numeric
|
||||
range. An exception is thrown when a runtime value-preservation check fails.</p>
|
||||
<p>The requirements on the argument and result types are:</p>
|
||||
<blockquote>
|
||||
<ul>
|
||||
<li>Both argument and result types are CopyConstructible [ISO Std 20.1.3].</li>
|
||||
<li>Both argument and result types are Numeric, defined by <code>std::numeric_limits<>::is_specialized</code>
|
||||
being true.</li>
|
||||
<li>The argument can be converted to the result type using <b>static_cast</b>.</li>
|
||||
</ul>
|
||||
</blockquote>
|
||||
<h3>numeric_cast synopsis</h3>
|
||||
<blockquote>
|
||||
<pre>namespace boost {
|
||||
...
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h3><a name="numeric_cast">numeric_cast</a></h3>
|
||||
|
||||
<p>A <b>static_cast</b> or implicit conversion will not detect failure to
|
||||
preserve range for numeric casts. The <b>numeric_cast</b> function
|
||||
templates are similar to <b>static_cast</b> and certain (dubious)
|
||||
implicit conversions in this respect, except that they detect loss of
|
||||
numeric range. An exception is thrown when a runtime value-preservation
|
||||
check fails.</p>
|
||||
|
||||
<p>The requirements on the argument and result types are:</p>
|
||||
|
||||
<blockquote>
|
||||
<ul>
|
||||
<li>Both argument and result types are CopyConstructible [ISO Std
|
||||
20.1.3].</li>
|
||||
|
||||
<li>Both argument and result types are Numeric, defined by
|
||||
<code>std::numeric_limits<>::is_specialized</code> being
|
||||
true.</li>
|
||||
|
||||
<li>The argument can be converted to the result type using
|
||||
<b>static_cast</b>.</li>
|
||||
</ul>
|
||||
</blockquote>
|
||||
|
||||
<h3>numeric_cast synopsis</h3>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
namespace boost {
|
||||
|
||||
class bad_numeric_cast : public std::bad_cast {...};
|
||||
|
||||
@@ -112,11 +151,15 @@ template<typename Target, typename Source>
|
||||
// overflow, as determined by std::numeric_limits
|
||||
// Returns: static_cast<Target>(arg)
|
||||
|
||||
}</pre>
|
||||
</blockquote>
|
||||
<h3>numeric_cast example</h3>
|
||||
<blockquote>
|
||||
<pre>#include <boost/cast.hpp>
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
<h3>numeric_cast example</h3>
|
||||
|
||||
<blockquote>
|
||||
<pre>
|
||||
#include <boost/cast.hpp>
|
||||
using namespace boost::cast;
|
||||
|
||||
void ariane(double vx)
|
||||
@@ -124,27 +167,36 @@ void ariane(double vx)
|
||||
...
|
||||
unsigned short dx = numeric_cast<unsigned short>(vx);
|
||||
...
|
||||
}</pre>
|
||||
</blockquote>
|
||||
<h3>numeric_cast rationale</h3>
|
||||
<p>The form of the throws condition is specified so that != is not a required
|
||||
operation.</p>
|
||||
<h3>History</h3>
|
||||
<p><b>polymorphic_cast</b> was suggested by Bjarne Stroustrup in "The C++
|
||||
Programming Language".<br>
|
||||
<b>polymorphic_downcast</b> was contributed by <a href="../../people/dave_abrahams.htm">Dave
|
||||
Abrahams</a>.<b><br>
|
||||
numeric_cast</b> was contributed by <a href="../../people/kevlin_henney.htm">Kevlin
|
||||
Henney</a>.</p>
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan
|
||||
-->06 January, 2001<!--webbot bot="Timestamp" endspan i-checksum="38320"
|
||||
--></p>
|
||||
<p>© Copyright boost.org 1999. Permission to copy, use, modify, sell and
|
||||
distribute this document is granted provided this copyright notice appears in
|
||||
all copies. This document is provided "as is" without express or
|
||||
implied warranty, and with no claim as to its suitability for any purpose.</p>
|
||||
}
|
||||
</pre>
|
||||
</blockquote>
|
||||
|
||||
</body>
|
||||
<h3>numeric_cast rationale</h3>
|
||||
|
||||
<p>The form of the throws condition is specified so that != is not a
|
||||
required operation.</p>
|
||||
|
||||
<h3>History</h3>
|
||||
|
||||
<p><b>polymorphic_cast</b> was suggested by Bjarne Stroustrup in "The C++
|
||||
Programming Language".<br>
|
||||
<b>polymorphic_downcast</b> was contributed by <a href=
|
||||
"../../people/dave_abrahams.htm">Dave Abrahams</a>.<b><br>
|
||||
numeric_cast</b> was contributed by <a href=
|
||||
"../../people/kevlin_henney.htm">Kevlin Henney</a>.</p>
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan
|
||||
-->06 January, 2001
|
||||
<!--webbot bot="Timestamp" endspan i-checksum="38320"
|
||||
--></p>
|
||||
|
||||
<p>© Copyright boost.org 1999. Permission to copy, use, modify, sell
|
||||
and distribute this document is granted provided this copyright notice
|
||||
appears in all copies. This document is provided "as is" without express
|
||||
or implied warranty, and with no claim as to its suitability for any
|
||||
purpose.</p>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
|
||||
@@ -175,7 +175,7 @@ namespace boost
|
||||
# ifdef LONGLONG_MIN
|
||||
return LONGLONG_MIN;
|
||||
# else
|
||||
return -9223372036854775808LL; // hope this is portable
|
||||
return -( 9223372036854775807LL )-1; // hope this is portable
|
||||
# endif
|
||||
}
|
||||
};
|
||||
|
||||
Executable
+36
@@ -0,0 +1,36 @@
|
||||
// Copyright David Abrahams 2003. Permission to copy, use,
|
||||
// modify, sell and distribute this software is granted provided this
|
||||
// copyright notice appears in all copies. This software is provided
|
||||
// "as is" without express or implied warranty, and with no claim as
|
||||
// to its suitability for any purpose.
|
||||
#ifndef IMPLICIT_CAST_DWA200356_HPP
|
||||
# define IMPLICIT_CAST_DWA200356_HPP
|
||||
|
||||
# include <boost/mpl/identity.hpp>
|
||||
|
||||
namespace boost {
|
||||
|
||||
// implementation originally suggested by C. Green in
|
||||
// http://lists.boost.org/MailArchives/boost/msg00886.php
|
||||
|
||||
// The use of identity creates a non-deduced form, so that the
|
||||
// explicit template argument must be supplied
|
||||
template <typename T>
|
||||
inline T implicit_cast (typename mpl::identity<T>::type x) {
|
||||
return x;
|
||||
}
|
||||
|
||||
// incomplete return type now is here
|
||||
//template <typename T>
|
||||
//void implicit_cast (...);
|
||||
|
||||
// Macro for when you need a constant expression (Gennaro Prota)
|
||||
#define BOOST_IMPLICIT_CAST(dst_type, expr) \
|
||||
( sizeof( implicit_cast<dst_type>(expr) ) \
|
||||
, \
|
||||
static_cast<dst_type>(expr) \
|
||||
)
|
||||
|
||||
} // namespace boost
|
||||
|
||||
#endif // IMPLICIT_CAST_DWA200356_HPP
|
||||
@@ -18,6 +18,7 @@
|
||||
#include <typeinfo>
|
||||
#include <boost/config.hpp>
|
||||
#include <boost/limits.hpp>
|
||||
#include <boost/throw_exception.hpp>
|
||||
#include <boost/type_traits/is_pointer.hpp>
|
||||
|
||||
#ifdef BOOST_NO_STRINGSTREAM
|
||||
@@ -29,51 +30,47 @@
|
||||
#if defined(BOOST_NO_STRINGSTREAM) || \
|
||||
defined(BOOST_NO_STD_WSTRING) || \
|
||||
defined(BOOST_NO_STD_LOCALE) || \
|
||||
defined(BOOST_NO_CWCHAR) || \
|
||||
defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)
|
||||
defined(BOOST_NO_INTRINSIC_WCHAR_T)
|
||||
#define DISABLE_WIDE_CHAR_SUPPORT
|
||||
#endif
|
||||
|
||||
#ifdef BOOST_NO_INTRINSIC_WCHAR_T
|
||||
#include <cwchar>
|
||||
#endif
|
||||
|
||||
namespace boost
|
||||
{
|
||||
// exception used to indicate runtime lexical_cast failure
|
||||
class bad_lexical_cast : public std::bad_cast
|
||||
{
|
||||
public:
|
||||
bad_lexical_cast() :
|
||||
source(&typeid(void)), target(&typeid(void))
|
||||
{
|
||||
}
|
||||
bad_lexical_cast(
|
||||
const std::type_info &s,
|
||||
const std::type_info &t) :
|
||||
source(&s), target(&t)
|
||||
{
|
||||
}
|
||||
const std::type_info &source_type() const
|
||||
{
|
||||
return *source;
|
||||
}
|
||||
const std::type_info &target_type() const
|
||||
{
|
||||
return *target;
|
||||
}
|
||||
virtual const char *what() const throw()
|
||||
{
|
||||
return "bad lexical cast: "
|
||||
"source type value could not be interpreted as target";
|
||||
}
|
||||
virtual ~bad_lexical_cast() throw()
|
||||
{
|
||||
}
|
||||
private:
|
||||
const std::type_info *source;
|
||||
const std::type_info *target;
|
||||
};
|
||||
|
||||
namespace detail // actual underlying concrete exception type
|
||||
{
|
||||
template<typename Target, typename Source>
|
||||
class no_lexical_conversion : public bad_lexical_cast
|
||||
{
|
||||
public:
|
||||
no_lexical_conversion()
|
||||
: description(
|
||||
std::string() + "bad lexical cast: " +
|
||||
"source type value could not be interpreted as target, Target=" +
|
||||
typeid(Target).name() + ", Source=" + typeid(Source).name())
|
||||
{
|
||||
}
|
||||
virtual ~no_lexical_conversion() throw()
|
||||
{
|
||||
}
|
||||
virtual const char *what() const throw()
|
||||
{
|
||||
return description.c_str();
|
||||
}
|
||||
private:
|
||||
const std::string description; // static initialization fails on MSVC6
|
||||
};
|
||||
}
|
||||
|
||||
namespace detail // selectors for choosing stream character type
|
||||
{
|
||||
template<typename Type>
|
||||
@@ -144,7 +141,7 @@ namespace boost
|
||||
}
|
||||
bool operator<<(const Source &input)
|
||||
{
|
||||
return stream << input;
|
||||
return !(stream << input).fail();
|
||||
}
|
||||
template<typename InputStreamable>
|
||||
bool operator>>(InputStreamable &output)
|
||||
@@ -190,7 +187,7 @@ namespace boost
|
||||
Target result;
|
||||
|
||||
if(!(interpreter << arg && interpreter >> result))
|
||||
throw detail::no_lexical_conversion<Target, Source>();
|
||||
throw_exception(bad_lexical_cast(typeid(Target), typeid(Source)));
|
||||
return result;
|
||||
}
|
||||
}
|
||||
@@ -205,3 +202,4 @@ namespace boost
|
||||
|
||||
#undef DISABLE_WIDE_CHAR_SUPPORT
|
||||
#endif
|
||||
|
||||
|
||||
+14
-2
@@ -25,8 +25,7 @@
|
||||
#if defined(BOOST_NO_STRINGSTREAM) || \
|
||||
defined(BOOST_NO_STD_WSTRING) || \
|
||||
defined(BOOST_NO_STD_LOCALE) || \
|
||||
defined(BOOST_NO_CWCHAR) || \
|
||||
defined(BOOST_MSVC) && (BOOST_MSVC <= 1200)
|
||||
defined(BOOST_NO_INTRINSIC_WCHAR_T)
|
||||
#define DISABLE_WIDE_CHAR_SUPPORT
|
||||
#endif
|
||||
|
||||
@@ -37,6 +36,7 @@ void test_conversion_to_int();
|
||||
void test_conversion_to_double();
|
||||
void test_conversion_to_bool();
|
||||
void test_conversion_to_string();
|
||||
void test_conversion_from_to_wchar_t_alias();
|
||||
void test_conversion_to_pointer();
|
||||
void test_conversion_from_wchar_t();
|
||||
void test_conversion_to_wchar_t();
|
||||
@@ -51,6 +51,7 @@ unit_test_framework::test_suite *init_unit_test_suite(int, char **)
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_to_int));
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_to_double));
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_to_bool));
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_from_to_wchar_t_alias));
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_to_pointer));
|
||||
suite->add(BOOST_TEST_CASE(test_conversion_to_string));
|
||||
#ifndef DISABLE_WIDE_CHAR_SUPPORT
|
||||
@@ -180,6 +181,17 @@ void test_conversion_to_string()
|
||||
BOOST_CHECK_EQUAL("", lexical_cast<std::string>(std::string("")));
|
||||
}
|
||||
|
||||
void test_conversion_from_to_wchar_t_alias()
|
||||
{
|
||||
BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned short>("123"));
|
||||
BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned int>("123"));
|
||||
BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned long>("123"));
|
||||
BOOST_CHECK_EQUAL(std::string("123"),
|
||||
lexical_cast<std::string>(static_cast<unsigned short>(123)));
|
||||
BOOST_CHECK_EQUAL(std::string("123"), lexical_cast<std::string>(123u));
|
||||
BOOST_CHECK_EQUAL(std::string("123"), lexical_cast<std::string>(123ul));
|
||||
}
|
||||
|
||||
void test_conversion_to_pointer()
|
||||
{
|
||||
BOOST_CHECK_THROW(lexical_cast<char *>("Test"), boost::bad_lexical_cast);
|
||||
|
||||
@@ -0,0 +1,33 @@
|
||||
# Signals library
|
||||
|
||||
# Copyright (C) 2001-2003 Douglas Gregor
|
||||
|
||||
# Permission to copy, use, sell and distribute this software is granted
|
||||
# provided this copyright notice appears in all copies. Permission to modify
|
||||
# the code and to distribute modified code is granted provided this copyright
|
||||
# notice appears in all copies, and a notice that the code was modified is
|
||||
# included with the copyright notice. This software is provided "as is"
|
||||
# without express or implied warranty, and with no claim as to its suitability
|
||||
# for any purpose.
|
||||
|
||||
# For more information, see http://www.boost.org/
|
||||
|
||||
|
||||
# Testing Jamfile autogenerated from XML source
|
||||
subproject libs/conversion/test ;
|
||||
|
||||
# bring in rules for testing
|
||||
import testing ;
|
||||
|
||||
# Make tests run by default.
|
||||
DEPENDS all : test ;
|
||||
|
||||
{
|
||||
test-suite conversion
|
||||
: [ run implicit_cast.cpp ]
|
||||
[ compile-fail implicit_cast_fail.cpp ]
|
||||
[ run ../cast_test.cpp ]
|
||||
[ run ../lexical_cast_test.cpp ]
|
||||
;
|
||||
}
|
||||
|
||||
@@ -0,0 +1,25 @@
|
||||
# Signals library
|
||||
|
||||
# Copyright (C) 2001-2003 Douglas Gregor
|
||||
|
||||
# Permission to copy, use, sell and distribute this software is granted
|
||||
# provided this copyright notice appears in all copies. Permission to modify
|
||||
# the code and to distribute modified code is granted provided this copyright
|
||||
# notice appears in all copies, and a notice that the code was modified is
|
||||
# included with the copyright notice. This software is provided "as is"
|
||||
# without express or implied warranty, and with no claim as to its suitability
|
||||
# for any purpose.
|
||||
|
||||
# For more information, see http://www.boost.org/
|
||||
|
||||
# bring in rules for testing
|
||||
import testing ;
|
||||
|
||||
test-suite conversion
|
||||
: [ run implicit_cast.cpp ]
|
||||
[ compile-fail implicit_cast_fail.cpp ]
|
||||
[ run ../cast_test.cpp ]
|
||||
[ run ../lexical_cast_test.cpp ]
|
||||
;
|
||||
|
||||
|
||||
@@ -0,0 +1,34 @@
|
||||
// Copyright David Abrahams 2003. Permission to copy, use,
|
||||
// modify, sell and distribute this software is granted provided this
|
||||
// copyright notice appears in all copies. This software is provided
|
||||
// "as is" without express or implied warranty, and with no claim as
|
||||
// to its suitability for any purpose.
|
||||
|
||||
#include <boost/implicit_cast.hpp>
|
||||
#include <cassert>
|
||||
#include <boost/type.hpp>
|
||||
|
||||
using boost::implicit_cast;
|
||||
using boost::type;
|
||||
|
||||
template <class T>
|
||||
type<T> check_return(T) { return type<T>(); }
|
||||
|
||||
struct foo
|
||||
{
|
||||
foo(char const*) {}
|
||||
operator long() const { return 0; }
|
||||
};
|
||||
|
||||
typedef type<long> long_type;
|
||||
typedef type<foo> foo_type;
|
||||
|
||||
int main()
|
||||
{
|
||||
type<long> x = check_return(boost::implicit_cast<long>(1));
|
||||
assert(boost::implicit_cast<long>(1) == 1L);
|
||||
|
||||
type<foo> f = check_return(boost::implicit_cast<foo>("hello"));
|
||||
type<long> z = check_return(boost::implicit_cast<long>(foo("hello")));
|
||||
return 0;
|
||||
}
|
||||
@@ -0,0 +1,23 @@
|
||||
// Copyright David Abrahams 2003. Permission to copy, use,
|
||||
// modify, sell and distribute this software is granted provided this
|
||||
// copyright notice appears in all copies. This software is provided
|
||||
// "as is" without express or implied warranty, and with no claim as
|
||||
// to its suitability for any purpose.
|
||||
|
||||
#include <boost/implicit_cast.hpp>
|
||||
#include <boost/type.hpp>
|
||||
|
||||
#define BOOST_INCLUDE_MAIN
|
||||
#include <boost/test/test_tools.hpp>
|
||||
|
||||
using boost::implicit_cast;
|
||||
|
||||
struct foo
|
||||
{
|
||||
explicit foo(char const*) {}
|
||||
};
|
||||
|
||||
int test_main(int, char*[])
|
||||
{
|
||||
foo x = implicit_cast<foo>("foobar");
|
||||
}
|
||||
Reference in New Issue
Block a user