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moved source(pair) and target(pair) into namespace std

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[SVN r11096]
This commit is contained in:
Jeremy Siek
2001-09-11 15:28:50 +00:00
parent f41fc4c8b0
commit d01e32a0c8
1 changed files with 16 additions and 7 deletions
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23
include/boost/graph/graph_traits.hpp
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@@ -100,20 +100,29 @@ namespace boost {
} // namespace boost
/* Some helper functions for dealing with pairs as edges */
template <class T, class G>
T source(std::pair<T,T> p, const G&) { return p.first; }
// Since pair is in namespace std, Koenig lookup will find source and
// target if they are also defined in namespace std. This is illegal,
// but the alternative is to put source and target in the global
// namespace which causes name conflicts with other libraries (like
// SUIF).
namespace std {
template <class T, class G>
T target(std::pair<T,T> p, const G&) { return p.second; }
/* Some helper functions for dealing with pairs as edges */
template <class T, class G>
T source(pair<T,T> p, const G&) { return p.first; }
template <class T, class G>
T target(pair<T,T> p, const G&) { return p.second; }
}
#if defined(__GNUC__) && defined(__SGI_STL_PORT)
// For some reason g++ with STLport does not see the above definition
// of source() and target() unless we bring them into the boost
// namespace.
namespace boost {
using ::source;
using ::target;
using std::source;
using std::target;
}
#endif