boostorg/mp11
1
0
Fork 1
mirror of https://github.com/boostorg/mp11.git synced 2026-05-05 12:14:13 +02:00
Code Issues Packages Projects Releases Wiki Activity

Add mp_cond

Browse Source
This commit is contained in:
Peter Dimov
2017-10-14 02:53:38 +03:00
parent 602147bf31
commit 30fcc21d8b
4 changed files with 112 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/boost/mp11/utility.hpp
+25
View File
@@ -107,6 +107,31 @@ template<bool C, class T, template<class...> class F, class... U> using mp_eval_
template<class C, class T, template<class...> class F, class... U> using mp_eval_if = typename detail::mp_eval_if_c_impl<static_cast<bool>(C::value), T, F, U...>::type;
template<class C, class T, class Q, class... U> using mp_eval_if_q = typename detail::mp_eval_if_c_impl<static_cast<bool>(C::value), T, Q::template fn, U...>::type;
// mp_cond
// so elegant; so doesn't work
// template<class C, class T, class... E> using mp_cond = mp_eval_if<C, T, mp_cond, E...>;
namespace detail
{
template<class C, class T, class... E> struct mp_cond_impl;
} // namespace detail
template<class C, class T, class... E> using mp_cond = typename detail::mp_cond_impl<C, T, E...>::type;
namespace detail
{
template<class C, class T, class... E> using mp_cond_ = mp_eval_if<C, T, mp_cond, E...>;
template<class C, class T, class... E> struct mp_cond_impl: mp_defer<mp_cond_, C, T, E...>
{
};
} // namespace detail
// mp_quote
template<template<class...> class F> struct mp_quote
{