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Support more than 1024 list elements in mp_for_each on msvc

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This commit is contained in:
Peter Dimov
2018-12-16 20:13:11 +02:00
parent af3acc3206
commit 6e8559b138
2 changed files with 28 additions and 4 deletions
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23
include/boost/mp11/algorithm.hpp
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@@ -970,11 +970,34 @@ template<class F> BOOST_MP11_CONSTEXPR F mp_for_each_impl( mp_list<>, F && f )
} // namespace detail
#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, >= 1900 )
// msvc has a limit of 1024
template<class L, class F> BOOST_MP11_CONSTEXPR mp_if_c<mp_size<L>::value <= 1024, F> mp_for_each( F && f )
{
return detail::mp_for_each_impl( mp_rename<L, mp_list>(), std::forward<F>(f) );
}
template<class L, class F> BOOST_MP11_CONSTEXPR mp_if_c<mp_size<L>::value >= 1025, F> mp_for_each( F && f )
{
using L2 = mp_rename<L, mp_list>;
using L3 = mp_take_c<L2, 1024>;
using L4 = mp_drop_c<L2, 1024>;
return mp_for_each<L4>( mp_for_each<L3>( std::forward<F>(f) ) );
}
#else
template<class L, class F> BOOST_MP11_CONSTEXPR F mp_for_each( F && f )
{
return detail::mp_for_each_impl( mp_rename<L, mp_list>(), std::forward<F>(f) );
}
#endif
// mp_insert<L, I, T...>
template<class L, class I, class... T> using mp_insert = mp_append<mp_take<L, I>, mp_push_front<mp_drop<L, I>, T...>>;

9
test/mp_for_each.cpp
View File

@@ -12,6 +12,7 @@
#include <boost/mp11/detail/config.hpp>
#include <boost/core/lightweight_test.hpp>
#include <tuple>
#include <cstdint>
#if defined( BOOST_MP11_HAS_CXX14_CONSTEXPR )
# define CONSTEXPR14 constexpr
@@ -30,8 +31,8 @@ struct F
struct G
{
std::size_t s;
CONSTEXPR14 void operator()( std::size_t i ) { s += i; }
std::uint32_t s;
CONSTEXPR14 void operator()( std::uint32_t i ) { s = s * 3 + i; }
};
using boost::mp11::mp_list;
@@ -55,8 +56,8 @@ int main()
#if BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, <= 1800 )
#else
using L = mp_iota_c<1024>;
std::size_t const R = 523776;
using L = mp_iota_c<1089>;
std::uint32_t const R = 598075296;
BOOST_TEST_EQ( (mp_for_each<L>( G{0} ).s), R );