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NO_VOID_RETURNS workaround.

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[SVN r19167]
This commit is contained in:
Eric Friedman
2003-07-17 08:45:31 +00:00
parent acca3a4fd9
commit 333ed0a327
1 changed files with 41 additions and 7 deletions
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48
include/boost/variant/visitor_ptr.hpp
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@@ -21,8 +21,9 @@
#include "boost/mpl/apply_if.hpp"
#include "boost/mpl/identity.hpp"
#include "boost/type_traits/is_reference.hpp"
#include "boost/type_traits/add_reference.hpp"
#include "boost/type_traits/is_reference.hpp"
#include "boost/type_traits/is_void.hpp"
namespace boost {
@@ -35,12 +36,14 @@ namespace boost {
struct bad_visit
: std::exception
{
public:
public: // std::exception interface
virtual const char * what() const throw()
{
return "boost::bad_visit: "
"failed visitation using boost::apply_visitor";
}
};
@@ -81,17 +84,48 @@ public: // structors
public: // static visitor interfaces
result_type operator()(argument_fwd_type operand) const
{
return visitor_(operand);
}
template <typename U>
result_type operator()(const U&) const
{
throw bad_visit();
}
#if !defined(BOOST_NO_VOID_RETURNS)
public: // static visitor interfaces, cont.
result_type operator()(argument_fwd_type operand) const
{
return visitor_(operand);
}
#else // defined(BOOST_NO_VOID_RETURNS)
private: // helpers, for static visitor interfaces (below)
result_type execute_impl(argument_fwd_type operand, mpl::false_) const
{
return visitor_(operand);
}
BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(void)
execute_impl(argument_fwd_type operand, mpl::true_) const
{
visitor_(operand);
BOOST_VARIANT_AUX_RETURN_VOID;
}
public: // static visitor interfaces, cont.
BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(result_type)
operator()(argument_fwd_type operand) const
{
typedef typename is_void<result_type>::type has_void_result;
return execute_impl(operand, has_void_result());
}
#endif // BOOST_NO_VOID_RETURNS workaround
};
template <typename R, typename T>