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Add test/variant_in_place_index_construct(_cx)

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This commit is contained in:
Peter Dimov
2017-05-30 16:57:48 +03:00
parent a99b5f8e2e
commit 2357f4d2f4
4 changed files with 264 additions and 1 deletions
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23
include/boost/variant2/variant.hpp
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@@ -592,12 +592,32 @@ template<class T> struct in_place_type_t
{
};
template<class T> constexpr in_place_type_t<T> in_place_type{};
namespace detail
{
template<class T> struct is_in_place_type: std::false_type {};
template<class T> struct is_in_place_type<in_place_type_t<T>>: std::true_type {};
} // namespace detail
// in_place_index_t
template<std::size_t I> struct in_place_index_t
{
};
template<std::size_t I> constexpr in_place_index_t<I> in_place_index{};
namespace detail
{
template<class T> struct is_in_place_index: std::false_type {};
template<std::size_t I> struct is_in_place_index<in_place_index_t<I>>: std::true_type {};
} // namespace detail
// variant
template<class... T> class variant: private variant2::detail::variant_base<T...>
@@ -643,7 +663,8 @@ public:
}
template<class U,
class E1 = std::enable_if_t<!std::is_same<std::decay_t<U>, variant>::value>,
class Ud = std::decay_t<U>,
class E1 = std::enable_if_t< !std::is_same<Ud, variant>::value && !variant2::detail::is_in_place_index<Ud>::value && !variant2::detail::is_in_place_type<Ud>::value >,
class V = variant2::detail::resolve_overload_type<U&&, T...>,
class E2 = std::enable_if_t<std::is_constructible<V, U>::value>
>

2
test/Jamfile
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@@ -25,3 +25,5 @@ run variant_copy_construct.cpp : : : $(REQ) ;
run variant_move_construct.cpp : : : $(REQ) ;
run variant_value_construct.cpp : : : $(REQ) ;
compile variant_value_construct_cx.cpp : : : $(REQ) ;
run variant_in_place_index_construct.cpp : : : $(REQ) ;
compile variant_in_place_index_construct_cx.cpp : : : $(REQ) ;

124
test/variant_in_place_index_construct.cpp Normal file
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@@ -0,0 +1,124 @@
// Copyright 2017 Peter Dimov.
//
// 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/variant2/variant.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <utility>
#include <string>
using namespace boost::variant2;
struct X
{
X() = default;
X( in_place_index_t<0> ) = delete;
};
int main()
{
{
variant<int> v( in_place_index<0> );
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 0 );
}
{
variant<X> v( in_place_index<0> );
BOOST_TEST_EQ( v.index(), 0 );
}
{
variant<int> v( in_place_index<0>, 1 );
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 1 );
}
{
variant<int, float> v( in_place_index<0> );
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 0 );
}
{
variant<int, float> v( in_place_index<0>, 1 );
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 1 );
}
{
variant<int, float> v( in_place_index<1> );
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 0 );
}
{
variant<int, float> v( in_place_index<1>, 3.14f );
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 3.14f );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<0>, 1 );
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 1 );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<1>, 1 );
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 1 );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<2>, 3.14f );
BOOST_TEST_EQ( v.index(), 2 );
BOOST_TEST_EQ( get<2>(v), 3.14f );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<3>, 3.14f );
BOOST_TEST_EQ( v.index(), 3 );
BOOST_TEST_EQ( get<3>(v), 3.14f );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<4>, "text" );
BOOST_TEST_EQ( v.index(), 4 );
BOOST_TEST_EQ( get<4>(v), std::string("text") );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<5>, "text" );
BOOST_TEST_EQ( v.index(), 5 );
BOOST_TEST_EQ( get<5>(v), std::string("text") );
}
{
variant<int, int, float, float, std::string, std::string> v( in_place_index<5>, 4, 'a' );
BOOST_TEST_EQ( v.index(), 5 );
BOOST_TEST_EQ( get<5>(v), std::string( 4, 'a' ) );
}
return boost::report_errors();
}

116
test/variant_in_place_index_construct_cx.cpp Normal file
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@@ -0,0 +1,116 @@
// Copyright 2017 Peter Dimov.
//
// 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/variant2/variant.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <utility>
#include <string>
using namespace boost::variant2;
struct X
{
constexpr X() = default;
constexpr explicit X(int, int) {}
X( in_place_index_t<0> ) = delete;
};
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
int main()
{
{
constexpr variant<int> v( in_place_index<0> );
STATIC_ASSERT( v.index() == 0 );
STATIC_ASSERT( get<0>(v) == 0 );
}
{
constexpr variant<X> v( in_place_index<0> );
STATIC_ASSERT( v.index() == 0 );
}
{
constexpr variant<int> v( in_place_index<0>, 1 );
STATIC_ASSERT( v.index() == 0 );
STATIC_ASSERT( get<0>(v) == 1 );
}
{
constexpr variant<int, float> v( in_place_index<0> );
STATIC_ASSERT( v.index() == 0 );
STATIC_ASSERT( get<0>(v) == 0 );
}
{
constexpr variant<int, float> v( in_place_index<0>, 1 );
STATIC_ASSERT( v.index() == 0 );
STATIC_ASSERT( get<0>(v) == 1 );
}
{
constexpr variant<int, float> v( in_place_index<1> );
STATIC_ASSERT( v.index() == 1 );
STATIC_ASSERT( get<1>(v) == 0 );
}
{
constexpr variant<int, float> v( in_place_index<1>, 3.14f );
STATIC_ASSERT( v.index() == 1 );
STATIC_ASSERT( get<1>(v) == 3.14f );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<0>, 1 );
STATIC_ASSERT( v.index() == 0 );
STATIC_ASSERT( get<0>(v) == 1 );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<1>, 1 );
STATIC_ASSERT( v.index() == 1 );
STATIC_ASSERT( get<1>(v) == 1 );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<2>, 3.14f );
STATIC_ASSERT( v.index() == 2 );
STATIC_ASSERT( get<2>(v) == 3.14f );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<3>, 3.14f );
STATIC_ASSERT( v.index() == 3 );
STATIC_ASSERT( get<3>(v) == 3.14f );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<4> );
STATIC_ASSERT( v.index() == 4 );
}
{
constexpr variant<int, int, float, float, X, X> v( in_place_index<5>, 0, 0 );
STATIC_ASSERT( v.index() == 5 );
}
}