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Apply a workaround for msvc-12.0

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This commit is contained in:
Peter Dimov
2020-03-19 16:11:39 +02:00
parent 64b9c1f874
commit 2c8ce53efb
1 changed files with 12 additions and 0 deletions
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12
include/boost/mp11/algorithm.hpp
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@ -1140,11 +1140,23 @@ template<class L> using mp_power_set = typename detail::mp_power_set_impl<L>::ty
namespace detail
{
#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, <= 1800 )
template<template<class...> class L, class... T> struct mp_power_set_impl< L<T...> >
{
static_assert( sizeof...(T) == 0, "T... must be empty" );
using type = L< L<> >;
};
#else
template<template<class...> class L> struct mp_power_set_impl< L<> >
{
using type = L< L<> >;
};
#endif
template<template<class...> class L, class T1, class... T> struct mp_power_set_impl< L<T1, T...> >
{
using S1 = mp_power_set< L<T...> >;