boostorg/mp11
1
0
Fork 1
mirror of https://github.com/boostorg/mp11.git synced 2025-08-05 23:34:34 +02:00
Code Issues Packages Projects Releases Wiki Activity

Add value list support to mp_drop. Refs #53.

Browse Source
This commit is contained in:
Peter Dimov
2023-05-16 20:24:06 +03:00
parent ce005d77ce
commit 1a8fa7064c
5 changed files with 103 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
doc/mp11/algorithm.adoc
View File

@@ -320,6 +320,8 @@ As `mp_product`, but takes a quoted metafunction.
`mp_drop_c<L, N>` removes the first `N` elements of `L` and returns the result.
Supports a value list as `L` under {cpp}17.
.mp_drop_c
[cols="<.^4m,6*^.^1m",width=85%]
|===

2
doc/mp11/changelog.adoc
View File

@@ -15,7 +15,7 @@ http://www.boost.org/LICENSE_1_0.txt
* Added an offset/from parameter to `mp_from_sequence`, `mp_iota`, `mp_iota_c`.
* Added `mp_value`, `mp_list_v`, `mp_rename_v`, `mp_is_value_list`.
* Added value list support to the primitives in `<boost/mp11/list.hpp>`.
* Added value list support to `mp_repeat`, `mp_fill`, `mp_at`, `mp_back`, `mp_take`, `mp_pop_back`.
* Added value list support to `mp_repeat`, `mp_fill`, `mp_at`, `mp_back`, `mp_take`, `mp_pop_back`, `mp_drop`.
## Changes in 1.79.0

2
include/boost/mp11/algorithm.hpp
View File

@@ -316,7 +316,7 @@ template<template<class...> class L, class... T, template<class...> class L2, cl
} // namespace detail
template<class L, std::size_t N> using mp_drop_c = typename detail::mp_drop_impl<L, mp_repeat_c<mp_list<void>, N>, mp_bool<N <= mp_size<L>::value>>::type;
template<class L, std::size_t N> using mp_drop_c = mp_assign<L, typename detail::mp_drop_impl<mp_rename<L, mp_list>, mp_repeat_c<mp_list<void>, N>, mp_bool<N <= mp_size<L>::value>>::type>;
template<class L, class N> using mp_drop = mp_drop_c<L, std::size_t{ N::value }>;

1
test/Jamfile
View File

@@ -91,6 +91,7 @@ run mp_repeat_2.cpp ;
run mp_repeat_3.cpp ;
run mp_product.cpp ;
run mp_drop.cpp ;
run mp_drop_2.cpp ;
run mp_iota.cpp ;
run mp_iota_2.cpp ;
run mp_at.cpp ;

98
test/mp_drop_2.cpp Normal file
View File

@@ -0,0 +1,98 @@
// Copyright 2023 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.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_trait.hpp>
template<auto... A> struct V1 {};
template<int... I> struct V2 {};
int main()
{
using boost::mp11::mp_drop;
using boost::mp11::mp_drop_c;
using boost::mp11::mp_size_t;
{
using L1 = V1<>;
BOOST_TEST_TRAIT_SAME(mp_drop_c<L1, 0>, L1);
BOOST_TEST_TRAIT_SAME(mp_drop<L1, mp_size_t<0>>, L1);
using L2 = V1<false, 0, true, 1, std::size_t(2)>;
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 0>, V1<false, 0, true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 1>, V1<0, true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 2>, V1<true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 3>, V1<1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 4>, V1<std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 5>, V1<>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<0>>, V1<false, 0, true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<1>>, V1<0, true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<2>>, V1<true, 1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<3>>, V1<1, std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<4>>, V1<std::size_t(2)>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<5>>, V1<>);
}
{
using L1 = V2<>;
BOOST_TEST_TRAIT_SAME(mp_drop_c<L1, 0>, L1);
BOOST_TEST_TRAIT_SAME(mp_drop<L1, mp_size_t<0>>, L1);
using L2 = V2<1, 2, 3, 4, 5>;
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 0>, V2<1, 2, 3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 1>, V2<2, 3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 2>, V2<3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 3>, V2<4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 4>, V2<5>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L2, 5>, V2<>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<0>>, V2<1, 2, 3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<1>>, V2<2, 3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<2>>, V2<3, 4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<3>>, V2<4, 5>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<4>>, V2<5>);
BOOST_TEST_TRAIT_SAME(mp_drop<L2, mp_size_t<5>>, V2<>);
}
using boost::mp11::mp_iota_c;
using boost::mp11::mp_rename_v;
{
using L1 = mp_rename_v<mp_iota_c<171>, V1>;
BOOST_TEST_TRAIT_SAME(mp_drop_c<L1, 169>, V1<std::size_t(169), std::size_t(170)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L1, 170>, V1<std::size_t(170)>);
BOOST_TEST_TRAIT_SAME(mp_drop_c<L1, 171>, V1<>);
}
using boost::mp11::mp_valid;
{
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<0>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<1>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<2>>));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<3>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<4>>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_drop, V2<1, 2, 3>, mp_size_t<5>>));
}
return boost::report_errors();
}
#endif