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The void partial specialization of the function classes has been removed in

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favor of a common interface. Regardless of the compiler's capabilities, the
result type of a Boost.Function function object that was declared void will
be "unused". This allows the result of a Boost.Function function object to
be passed as a parameter regardless of whether the function is declared as
returning void. It greatly simplifies the use of Boost.Function objects with
wrapper objects (i.e., when the side effects are important, but the result
isn't: consider binding and composition when calling a std::for_each loop)


[SVN r10491]
This commit is contained in:
Douglas Gregor
2001-07-01 02:17:36 +00:00
parent 53f9f4484f
commit 1f24873577
2 changed files with 7 additions and 320 deletions
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2
include/boost/function/function_base.hpp
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@ -103,13 +103,11 @@ namespace boost {
*/
template<typename T> struct function_return_type { typedef T type; };
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<>
struct function_return_type<void>
{
typedef unusable type;
};
#endif /* BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION */
// The operation type to perform on the given functor/function pointer
enum functor_manager_operation_type { clone_functor, destroy_functor };