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Define protect(f)::result_type only when F::result_type is defined

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Peter Dimov
2020-06-30 21:58:58 +03:00
parent 1aac698358
commit 9ce9a7ce99
2 changed files with 35 additions and 3 deletions
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include/boost/bind/protect.hpp
+15 -3
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@@ -24,7 +24,21 @@ namespace _bi
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_NO_CXX11_DECLTYPE)
template<class F> class protected_bind_t
template<class T> struct protect_make_void
{
typedef void type;
};
template<class F, class E = void> struct protect_result_type
{
};
template<class F> struct protect_result_type< F, typename protect_make_void<typename F::result_type>::type >
{
typedef typename F::result_type result_type;
};
template<class F> class protected_bind_t: public protect_result_type<F>
{
private:
@@ -32,8 +46,6 @@ private:
public:
typedef typename F::result_type result_type;
explicit protected_bind_t( F f ): f_( f )
{
}