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Add mp_list_v. Refs #53.

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This commit is contained in:
Peter Dimov
2023-05-14 21:51:08 +03:00
parent 9b4499b919
commit ac1b5c96ea
3 changed files with 42 additions and 0 deletions
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7
include/boost/mp11/list.hpp
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@@ -25,6 +25,13 @@ namespace mp11
// mp_list_c<T, I...>
template<class T, T... I> using mp_list_c = mp_list<std::integral_constant<T, I>...>;
// mp_list_v<A...>
#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
template<auto... A> struct mp_list_v {};
#endif
// mp_is_list<L>
// in detail/mp_is_list.hpp

1
test/Jamfile
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@@ -50,6 +50,7 @@ run mp_list_c.cpp ;
run mp_transform_front.cpp ;
run mp_transform_second.cpp ;
run mp_transform_third.cpp ;
run mp_list_v.cpp ;
# algorithm
run mp_assign.cpp ;

34
test/mp_list_v.cpp Normal file
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@@ -0,0 +1,34 @@
// Copyright 2023 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/list.hpp>
#if !defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
#pragma message("Test skipped because BOOST_MP11_HAS_TEMPLATE_AUTO is not defined")
int main() {}
#else
#include <boost/core/lightweight_test.hpp>
template<class L> bool is_value_list( L const& ) { return false; }
template<template<auto...> class L, auto... A> bool is_value_list( L<A...> const& ) { return true; }
int main()
{
using boost::mp11::mp_list_v;
using boost::mp11::mp_list;
BOOST_TEST_NOT(is_value_list( mp_list<>{} ));
BOOST_TEST(is_value_list( mp_list_v<>{} ));
BOOST_TEST(is_value_list( mp_list_v<false>{} ));
BOOST_TEST(is_value_list( mp_list_v<false, 0>{} ));
BOOST_TEST(is_value_list( mp_list_v<false, 0, std::size_t(0)>{} ));
return boost::report_errors();
}
#endif