feedc0de/boost_mp11
1
0
Fork 0
forked from boostorg/mp11
Code Pull Requests Activity

Add mp_transform_if_q

Browse Source
This commit is contained in:
Peter Dimov
2017-05-25 21:31:03 +03:00
parent 9371916c38
commit 6db4019341
5 changed files with 114 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/boost/mp11/algorithm.hpp
View File

@@ -125,14 +125,18 @@ namespace detail
template<template<class...> class P, template<class...> class F, class... L> struct mp_transform_if_impl
{
// the stupid quote-unquote dance avoids "pack expansion used as argument for non-pack parameter of alias template"
using Qp = mp_quote<P>;
using Qf = mp_quote<F>;
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, <= 1910 )
template<class... U> struct _f_ { using type = mp_eval_if<mp_not<mp_invoke<mp_quote<P>, U...>>, mp_first<mp_list<U...>>, mp_quote<F>::template fn, U...>; };
template<class... U> struct _f_ { using type = mp_eval_if_q<mp_not<mp_invoke<Qp, U...>>, mp_first<mp_list<U...>>, Qf, U...>; };
template<class... U> using _f = typename _f_<U...>::type;
#else
template<class... U> using _f = mp_eval_if<mp_not<mp_invoke<mp_quote<P>, U...>>, mp_first<mp_list<U...>>, mp_quote<F>::template fn, U...>;
template<class... U> using _f = mp_eval_if_q<mp_not<mp_invoke<Qp, U...>>, mp_first<mp_list<U...>>, Qf, U...>;
#endif
@@ -142,6 +146,7 @@ template<template<class...> class P, template<class...> class F, class... L> str
} // namespace detail
template<template<class...> class P, template<class...> class F, class... L> using mp_transform_if = typename detail::mp_transform_if_impl<P, F, L...>::type;
template<class Qp, class Qf, class... L> using mp_transform_if_q = typename detail::mp_transform_if_impl<Qp::template fn, Qf::template fn, L...>::type;
// mp_fill<L, V>
namespace detail