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Added BOOST_UNREACHABLE_RETURN workaround macro.

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[SVN r16574]
This commit is contained in:
John Maddock
2002-12-09 12:21:54 +00:00
parent 555d41525d
commit 3596eec09a
7 changed files with 111 additions and 5 deletions
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20
config.htm
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@@ -802,6 +802,14 @@ f(&amp;bar); // should choose #2.</pre>
<td>The compiler does not support template template
parameters.</td>
</tr>
<tr>
<td>BOOST_NO_UNREACHABLE_RETURN_DETECTION</td>
<td>Compiler</td>
<td>If a return is unreachable, then no return statement
should be required, however some compilers insist on it,
while other issue a bunch of warnings if it is in fact
present.</td>
</tr>
<tr>
<td valign="top" width="51%">BOOST_NO_USING_TEMPLATE</td>
<td valign="top" width="16%">Compiler</td>
@@ -904,9 +912,9 @@ present.</p>
<td>BOOST_HAS_NRVO</td>
<td>Compiler</td>
<td>Indicated that the compiler supports the named return
value optimization (NRVO). Used to select the most efficient
implementation for some function. See
<a href="../../boost/operators.hpp">boost/operators.hpp</a>
value optimization (NRVO). Used to select the most
efficient implementation for some function. See <a
href="../../boost/operators.hpp">boost/operators.hpp</a>
for example.</td>
</tr>
<tr>
@@ -1071,6 +1079,12 @@ provide workarounds for compiler/standard library defects.</p>
};</pre>
</td>
</tr>
<tr>
<td>BOOST_UNREACHABLE_RETURN(result)</td>
<td>Normally evaluates to nothing, but evaluates to <font
face="Courier New">return x;</font> if the compiler
requires a return, even when it can never be reached.</td>
</tr>
<tr>
<td valign="top" width="50%">BOOST_USE_FACET(Type, loc)</td>
<td valign="top" width="50%">When the standard library

11
include/boost/config/suffix.hpp
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@@ -309,6 +309,17 @@ namespace std {
# define BOOST_NESTED_TEMPLATE
#endif
// BOOST_UNREACHABLE_RETURN(x) workaround -------------------------------------//
// Normally evaluates to nothing, unless BOOST_NO_UNREACHABLE_RETURN_DETECTION
// is defined, in which case it evaluates to return x; Use when you have a return
// statement that can never be reached.
#ifdef BOOST_NO_UNREACHABLE_RETURN_DETECTION
# define BOOST_UNREACHABLE_RETURN(x) return x;
#else
# define BOOST_UNREACHABLE_RETURN(x)
#endif
// BOOST_DEDUCED_TYPENAME workaround ------------------------------------------//
//
// Some compilers don't support the use of `typename' for dependent

5
test/Jamfile
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@@ -1,6 +1,6 @@
#
# Regression test Jamfile for boost configuration setup.
# This file was automatically generated on Tue Nov 12 11:07:30 2002,
# This file was automatically generated on Mon Dec 9 12:06:12 2002,
# do not edit by hand...
#
subproject libs/config/test ;
@@ -102,6 +102,9 @@ test-suite "BOOST_NO_PRIVATE_IN_AGGREGATE" :
test-suite "BOOST_NO_POINTER_TO_MEMBER_CONST" :
[ run no_ptr_mem_const_pass.cpp <lib>../../test/build/prg_exec_monitor ]
[ link-fail no_ptr_mem_const_fail.cpp <lib>../../test/build/prg_exec_monitor ] ;
test-suite "BOOST_NO_UNREACHABLE_RETURN_DETECTION" :
[ run no_ret_det_pass.cpp <lib>../../test/build/prg_exec_monitor ]
[ link-fail no_ret_det_fail.cpp <lib>../../test/build/prg_exec_monitor ] ;
test-suite "BOOST_NO_STRINGSTREAM" :
[ run no_sstream_pass.cpp <lib>../../test/build/prg_exec_monitor ]
[ link-fail no_sstream_fail.cpp <lib>../../test/build/prg_exec_monitor ] ;

2
test/config_info.cpp
View File

@@ -915,9 +915,11 @@ void print_boost_macros()
PRINT_MACRO(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION);
PRINT_MACRO(BOOST_NO_TEMPLATE_TEMPLATES);
PRINT_MACRO(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS);
PRINT_MACRO(BOOST_NO_UNREACHABLE_RETURN_DETECTION);
PRINT_MACRO(BOOST_NO_USING_TEMPLATE);
PRINT_MACRO(BOOST_NO_VOID_RETURNS);
PRINT_MACRO(BOOST_STD_EXTENSION_NAMESPACE);
PRINT_MACRO(BOOST_UNREACHABLE_RETURN(0));
}
void print_separator()

8
test/config_test.cpp
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@@ -10,7 +10,7 @@
// Do not edit this file, it was generated automatically by
// ../tools/generate from boost_*.cxx on
// Tue Nov 12 11:07:30 2002
// Mon Dec 9 12:06:12 2002
#include <boost/config.hpp>
#define BOOST_INCLUDE_MAIN
@@ -167,6 +167,11 @@ namespace boost_no_private_in_aggregate = empty_boost;
#else
namespace boost_no_pointer_to_member_const = empty_boost;
#endif
#ifndef BOOST_NO_UNREACHABLE_RETURN_DETECTION
#include "boost_no_ret_det.cxx"
#else
namespace boost_no_unreachable_return_detection = empty_boost;
#endif
#ifndef BOOST_NO_STRINGSTREAM
#include "boost_no_sstream.cxx"
#else
@@ -413,6 +418,7 @@ int test_main( int, char *[] )
BOOST_TEST(0 == boost_no_std_distance::test());
BOOST_TEST(0 == boost_no_std_allocator::test());
BOOST_TEST(0 == boost_no_stringstream::test());
BOOST_TEST(0 == boost_no_unreachable_return_detection::test());
BOOST_TEST(0 == boost_no_pointer_to_member_const::test());
BOOST_TEST(0 == boost_no_private_in_aggregate::test());
BOOST_TEST(0 == boost_no_template_partial_specialization::test());

35
test/no_ret_det_fail.cpp Normal file
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@@ -0,0 +1,35 @@
// (C) Copyright Boost.org 1999. 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.
// Test file for macro BOOST_NO_UNREACHABLE_RETURN_DETECTION
// This file should not compile, if it does then
// BOOST_NO_UNREACHABLE_RETURN_DETECTION need not be defined.
// see boost_no_ret_det.cxx for more details
// Do not edit this file, it was generated automatically by
// ../tools/generate from boost_no_ret_det.cxx on
// Mon Dec 9 12:06:12 2002
// Must not have BOOST_ASSERT_CONFIG set; it defeats
// the objective of this file:
#ifdef BOOST_ASSERT_CONFIG
# undef BOOST_ASSERT_CONFIG
#endif
#include <boost/config.hpp>
#include "test.hpp"
#ifdef BOOST_NO_UNREACHABLE_RETURN_DETECTION
#include "boost_no_ret_det.cxx"
#else
#error "this file should not compile"
#endif
int cpp_main( int, char *[] )
{
return boost_no_unreachable_return_detection::test();
}

35
test/no_ret_det_pass.cpp Normal file
View File

@@ -0,0 +1,35 @@
// (C) Copyright Boost.org 1999. 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.
// Test file for macro BOOST_NO_UNREACHABLE_RETURN_DETECTION
// This file should compile, if it does not then
// BOOST_NO_UNREACHABLE_RETURN_DETECTION needs to be defined.
// see boost_no_ret_det.cxx for more details
// Do not edit this file, it was generated automatically by
// ../tools/generate from boost_no_ret_det.cxx on
// Mon Dec 9 12:06:12 2002
// Must not have BOOST_ASSERT_CONFIG set; it defeats
// the objective of this file:
#ifdef BOOST_ASSERT_CONFIG
# undef BOOST_ASSERT_CONFIG
#endif
#include <boost/config.hpp>
#include "test.hpp"
#ifndef BOOST_NO_UNREACHABLE_RETURN_DETECTION
#include "boost_no_ret_det.cxx"
#else
namespace boost_no_unreachable_return_detection = empty_boost;
#endif
int cpp_main( int, char *[] )
{
return boost_no_unreachable_return_detection::test();
}