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Merge pull request #26 from glenfe/develop

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Implement mp_starts_with
This commit is contained in:
Peter Dimov
2018-09-04 15:50:44 +03:00
committed by GitHub
parent 602c740690 f387448581
commit a0f7afba00
5 changed files with 142 additions and 0 deletions
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7
doc/mp11/algorithm.adoc
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@@ -199,6 +199,13 @@ As `mp_count_if`, but takes a quoted metafunction.
`mp_contains<L, V>` is `mp_true` when `L` contains an element `V`, `mp_false` otherwise.
## mp_starts_with<L1, L2>
template<class L1, class L2> using mp_starts_with = /*...*/;
`mp_starts_with<L1, L2>` is `mp_true` when `L1` starts with `L2`, `mp_false`
otherwise.
## mp_repeat_c<L, N>
template<class L, std::size_t N> using mp_repeat_c = /*...*/;

24
include/boost/mp11/algorithm.hpp
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@@ -987,6 +987,30 @@ template<class L, class I, class J> using mp_erase = mp_append<mp_take<L, I>, mp
// mp_erase_c<L, I, J>
template<class L, std::size_t I, std::size_t J> using mp_erase_c = mp_append<mp_take_c<L, I>, mp_drop_c<L, J>>;
// mp_starts_with<L1, L2>
// contributed by Glen Joseph Fernandes (glenjofe@gmail.com)
namespace detail {
template<class L1, class L2>
struct mp_starts_with_impl { };
template<template<class...> class L1, class... T1, template<class...> class L2,
class... T2>
struct mp_starts_with_impl<L1<T1...>, L2<T2...> > {
template<class L>
static mp_false check(L);
template<class... T>
static mp_true check(mp_list<T2..., T...>);
using type = decltype(check(mp_list<T1...>()));
};
} // namespace detail
template<class L1, class L2>
using mp_starts_with = typename detail::mp_starts_with_impl<L1, L2>::type;
// mp_min_element<L, P>
// mp_max_element<L, P>
// in detail/mp_min_element.hpp

2
test/Jamfile
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@@ -46,6 +46,8 @@ run mp_count.cpp ;
run mp_count_if.cpp ;
run mp_count_if_q.cpp ;
run mp_contains.cpp ;
run mp_starts_with.cpp ;
run mp_starts_with_sf.cpp ;
run mp_repeat.cpp ;
run mp_product.cpp ;
run mp_drop.cpp ;

64
test/mp_starts_with.cpp Normal file
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@@ -0,0 +1,64 @@
// Copyright 2018 Glen Joseph Fernandes
// (glenjofe@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <tuple>
#include <utility>
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_starts_with;
using boost::mp11::mp_true;
using boost::mp11::mp_false;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<>,
mp_list<> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<>,
mp_list<int> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
mp_list<> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<>,
std::tuple<int> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<std::tuple<int>,
mp_list<> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
mp_list<int> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
mp_list<char> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<std::tuple<int>,
mp_list<int> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
std::tuple<char> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void>,
mp_list<int> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void>,
mp_list<char> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
mp_list<int, void> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<std::pair<int, char>,
mp_list<int> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int>,
std::pair<int, char> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void>,
mp_list<int, void> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void>,
mp_list<int, int> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<std::tuple<int, char>,
mp_list<int, char> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, char>,
std::tuple<int, int> >, mp_false>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void, int>,
mp_list<int, void> >, mp_true>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_starts_with<mp_list<int, void, int>,
mp_list<int, int> >, mp_false>));
return boost::report_errors();
}

45
test/mp_starts_with_sf.cpp Normal file
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@@ -0,0 +1,45 @@
// Copyright 2018 Glen Joseph Fernandes
// (glenjofe@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/utility.hpp>
#include <boost/mp11/algorithm.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
int main()
{
using boost::mp11::mp_valid;
using boost::mp11::mp_starts_with;
using boost::mp11::mp_list;
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
mp_list<> >));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
mp_list<int> >));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
void, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
mp_list<>, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
mp_list<int>, void>));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
void, mp_list<> >));
BOOST_TEST_TRAIT_FALSE((mp_valid<mp_starts_with,
void, mp_list<int> >));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_starts_with,
mp_list<>, mp_list<> >));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_starts_with,
mp_list<>, mp_list<int> >));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_starts_with,
mp_list<int>, mp_list<> >));
BOOST_TEST_TRAIT_TRUE((mp_valid<mp_starts_with,
mp_list<int>, mp_list<char> >));
return boost::report_errors();
}