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Use mp_defer in mp_bind_front, mp_bind_back

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This commit is contained in:
Peter Dimov
2018-02-07 23:59:00 +02:00
parent a41fd401fd
commit 511f12c91e
1 changed files with 4 additions and 21 deletions
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25
include/boost/mp11/bind.hpp
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@@ -9,6 +9,7 @@
// http://www.boost.org/LICENSE_1_0.txt // http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp> #include <boost/mp11/algorithm.hpp>
#include <boost/mp11/utility.hpp>
#include <cstddef> #include <cstddef>
namespace boost namespace boost
@@ -65,19 +66,10 @@ template<class Q, class... T> using mp_bind_q = mp_bind<Q::template fn, T...>;
// mp_bind_front // mp_bind_front
template<template<class...> class F, class... T> struct mp_bind_front template<template<class...> class F, class... T> struct mp_bind_front
{ {
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, < 1920 && BOOST_MSVC >= 1900 ) // the indirection through mp_defer works around the language inability
#else
private:
#endif
template<class... U> struct _fn { using type = F<T..., U...>; };
public:
// the indirection through _fn works around the language inability
// to expand U... into a fixed parameter list of an alias template // to expand U... into a fixed parameter list of an alias template
template<class... U> using fn = typename _fn<U...>::type; template<class... U> using fn = typename mp_defer<F, T..., U...>::type;
}; };
template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template fn, T...>; template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template fn, T...>;
@@ -85,16 +77,7 @@ template<class Q, class... T> using mp_bind_front_q = mp_bind_front<Q::template
// mp_bind_back // mp_bind_back
template<template<class...> class F, class... T> struct mp_bind_back template<template<class...> class F, class... T> struct mp_bind_back
{ {
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, < 1920 && BOOST_MSVC >= 1900 ) template<class... U> using fn = typename mp_defer<F, U..., T...>::type;
#else
private:
#endif
template<class... U> struct _fn { using type = F<U..., T...>; };
public:
template<class... U> using fn = typename _fn<U...>::type;
}; };
template<class Q, class... T> using mp_bind_back_q = mp_bind_back<Q::template fn, T...>; template<class Q, class... T> using mp_bind_back_q = mp_bind_back<Q::template fn, T...>;