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VC++ workarounds

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[SVN r9950]
This commit is contained in:
Jeremy Siek
2001-04-23 22:27:56 +00:00
parent 8a1daa735b
commit 96fe03b71e
1 changed files with 51 additions and 16 deletions
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67
include/boost/graph/named_function_params.hpp
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@@ -440,6 +440,8 @@ namespace boost {
return Dispatcher::const_get_value(p, t2, tag2);
}
#if 0
template <typename Default>
const Default&
choose_param(const detail::error_property_not_found&, const Default& d)
@@ -448,6 +450,31 @@ namespace boost {
template <class P, class Default>
const P&
choose_param(const P& param, const Default&) { return param; }
#else
// MSVC++ workaround
namespace detail {
template <class Param>
struct choose_param_helper {
template <class Default> struct result { typedef Param type; };
template <typename Default>
static const Param& apply(const Param& p, const Default& d) { return p; }
};
template <>
struct choose_param_helper<error_property_not_found> {
template <class Default> struct result { typedef Default type; };
template <typename Default>
static const Default& apply(const error_property_not_found&, const Default& d)
{ return d; }
};
} // namespace detail
template <class P, class Default>
const typename detail::choose_param_helper<P>::template result<Default>::type&
choose_param(const P& param, const Default& d) {
return detail::choose_param_helper<P>::apply(param, d);
}
#endif
template <typename T>
inline bool is_default_param(const T&) { return false; }
@@ -463,12 +490,19 @@ namespace boost {
typedef const P& const_result_type;
typedef const P& result_type;
typedef P type;
static const_result_type const_apply(const P& p, const Graph&, Tag&)
{ return p; }
static result_type apply(const P& p, Graph&, Tag&)
{ return p; }
};
template <class P, class Graph, class Tag>
static typename bind<P, Graph, Tag>::const_result_type
const_apply(const P& p, const Graph&, Tag&)
{ return p; }
template <class P, class Graph, class Tag>
static typename bind<P, Graph, Tag>::result_type
apply(const P& p, Graph&, Tag&)
{ return p; }
};
struct choose_default_param {
template <class P, class Graph, class Tag>
struct bind {
@@ -478,17 +512,18 @@ namespace boost {
const_result_type;
typedef typename property_map<Graph, Tag>::const_type
type;
static const_result_type
const_apply(const P& p, const Graph& g, Tag tag) {
return get(tag, g);
}
static result_type
apply(const P& p, Graph& g, Tag tag) {
return get(tag, g);
}
};
template <class P, class Graph, class Tag>
static typename bind<P, Graph, Tag>::const_result_type
const_apply(const P& p, const Graph& g, Tag tag) {
return get(tag, g);
}
template <class P, class Graph, class Tag>
static typename bind<P, Graph, Tag>::result_type
apply(const P& p, Graph& g, Tag tag) {
return get(tag, g);
}
};
template <class Param>
@@ -532,7 +567,7 @@ namespace boost {
choose_const_pmap(const Param& p, const Graph& g, PropertyTag tag)
{
typedef typename
detail::choose_pmap_helper<Param,Graph,PropertyTag>::type Choice;
detail::choose_pmap_helper<Param,Graph,PropertyTag>::Selector Choice;
return Choice::const_apply(p, g, tag);
}
@@ -541,7 +576,7 @@ namespace boost {
choose_pmap(const Param& p, Graph& g, PropertyTag tag)
{
typedef typename
detail::choose_pmap_helper<Param,Graph,PropertyTag>::type Choice;
detail::choose_pmap_helper<Param,Graph,PropertyTag>::Selector Choice;
return Choice::apply(p, g, tag);
}