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System: provide optional throws function rather than throws object

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[SVN r50705]
This commit is contained in:
Beman Dawes
2009-01-21 18:01:14 +00:00
parent a6728e5fb9
commit 5bc362e4f3
2 changed files with 12 additions and 0 deletions
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10
include/boost/system/error_code.hpp
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@ -384,7 +384,17 @@ namespace boost
}; };
// predefined error_code object used as "throw on error" tag // predefined error_code object used as "throw on error" tag
# ifndef BOOST_SYSTEM_THROWS_FUNCTION
BOOST_SYSTEM_DECL extern error_code throws; BOOST_SYSTEM_DECL extern error_code throws;
# else
namespace detail { inline error_code * throws() { return 0; } }
// prevent misuse by poisoning the reference in a way that doesn't
// produce warnings or errors from popular compilers, and is also
// very efficient (as determined by inspectiing generated code)
inline error_code & throws()
{ return *detail::throws(); }
# endif
// non-member functions ------------------------------------------------// // non-member functions ------------------------------------------------//

2
src/error_code.cpp
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@ -411,11 +411,13 @@ namespace boost
namespace system namespace system
{ {
# ifndef BOOST_SYSTEM_THROWS_FUNCTION
BOOST_SYSTEM_DECL error_code throws; // "throw on error" special error_code; BOOST_SYSTEM_DECL error_code throws; // "throw on error" special error_code;
// note that it doesn't matter if this // note that it doesn't matter if this
// isn't initialized before use since // isn't initialized before use since
// the only use is to take its // the only use is to take its
// address for comparison purposes // address for comparison purposes
# endif
BOOST_SYSTEM_DECL const error_category & get_system_category() BOOST_SYSTEM_DECL const error_category & get_system_category()
{ {