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Make mp_infoke SFINAE-friendly

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Peter Dimov
2017-05-19 15:37:49 +03:00
parent 1d1be2bbf4
commit 7100d10c7e
3 changed files with 44 additions and 5 deletions
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include/boost/mp11/utility.hpp
+10 -5
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@@ -116,19 +116,24 @@ template<template<class...> class F> struct mp_quote
template<class... T> using fn = typename mp_defer<F, T...>::type;
};
// mp_unquote
// mp_invoke
#if BOOST_WORKAROUND( BOOST_MSVC, < 1900 )
namespace detail
{
template<class Q, class... T> struct mp_invoke_impl
{
using type = typename Q::template fn<T...>;
};
template<class Q, class... T> struct mp_invoke_impl: mp_defer<Q::template fn, T...> {};
} // namespace detail
template<class Q, class... T> using mp_invoke = typename detail::mp_invoke_impl<Q, T...>::type;
#else
template<class Q, class... T> using mp_invoke = typename Q::template fn<T...>;
#endif
} // namespace mp11
} // namespace boost