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Add test/variant_value_assign

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Peter Dimov
2017-05-31 01:31:46 +03:00
parent e0e48d365c
commit 77fe037209
2 changed files with 207 additions and 0 deletions
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test/Jamfile
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@ -31,3 +31,4 @@ run variant_in_place_type_construct.cpp : : : $(REQ) ;
compile variant_in_place_type_construct_cx.cpp : : : $(REQ) ;
run variant_copy_assign.cpp : : : $(REQ) ;
run variant_move_assign.cpp : : : $(REQ) ;
run variant_value_assign.cpp : : : $(REQ) ;

206
test/variant_value_assign.cpp Normal file
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@ -0,0 +1,206 @@
// 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;
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
struct X1
{
int v;
X1(): v(0) {}
explicit X1(int v): v(v) {}
X1(X1 const& r): v(r.v) {}
X1(X1&& r): v(r.v) {}
X1& operator=( X1 const& r ) { v = r.v; return *this; }
X1& operator=( X1&& r ) { v = r.v; return *this; }
};
inline bool operator==( X1 const& a, X1 const& b ) { return a.v == b.v; }
STATIC_ASSERT( !std::is_nothrow_default_constructible<X1>::value );
STATIC_ASSERT( !std::is_nothrow_copy_constructible<X1>::value );
STATIC_ASSERT( !std::is_nothrow_move_constructible<X1>::value );
STATIC_ASSERT( !std::is_nothrow_copy_assignable<X1>::value );
STATIC_ASSERT( !std::is_nothrow_move_assignable<X1>::value );
struct X2
{
int v;
X2(): v(0) {}
explicit X2(int v): v(v) {}
X2(X2 const& r): v(r.v) {}
X2(X2&& r): v(r.v) {}
X2& operator=( X2 const& r ) { v = r.v; return *this; }
X2& operator=( X2&& r ) { v = r.v; return *this; }
};
inline bool operator==( X2 const& a, X2 const& b ) { return a.v == b.v; }
STATIC_ASSERT( !std::is_nothrow_default_constructible<X2>::value );
STATIC_ASSERT( !std::is_nothrow_copy_constructible<X2>::value );
STATIC_ASSERT( !std::is_nothrow_move_constructible<X2>::value );
STATIC_ASSERT( !std::is_nothrow_copy_assignable<X2>::value );
STATIC_ASSERT( !std::is_nothrow_move_assignable<X2>::value );
int main()
{
{
variant<int> v;
BOOST_TEST_EQ( get<0>(v), 0 );
v = 1;
BOOST_TEST_EQ( get<0>(v), 1 );
v = 2;
BOOST_TEST_EQ( get<0>(v), 2 );
int w1 = 3;
v = w1;
BOOST_TEST_EQ( get<0>(v), 3 );
int const w2 = 4;
v = w2;
BOOST_TEST_EQ( get<0>(v), 4 );
v = std::move( w1 );
BOOST_TEST_EQ( get<0>(v), 3 );
v = std::move( w2 );
BOOST_TEST_EQ( get<0>(v), 4 );
}
{
variant<int, float> v;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 0 );
v = 1;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 1 );
v = 3.14f;
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 3.14f );
float w1 = 3.15f;
v = w1;
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 3.15f );
int const w2 = 2;
v = w2;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 2 );
v = std::move(w1);
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v), 3.15f );
v = std::move(w2);
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 2 );
}
{
variant<int, int, float, std::string> v;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v), 0 );
v = 3.14f;
BOOST_TEST_EQ( v.index(), 2 );
BOOST_TEST_EQ( get<2>(v), 3.14f );
float const w1 = 3.15f;
v = w1;
BOOST_TEST_EQ( v.index(), 2 );
BOOST_TEST_EQ( get<2>(v), 3.15f );
variant<int, int, float, std::string> v5( "s1" );
v = "s1";
BOOST_TEST_EQ( v.index(), 3 );
BOOST_TEST_EQ( get<3>(v), std::string("s1") );
std::string w2( "s2" );
v = w2;
BOOST_TEST_EQ( v.index(), 3 );
BOOST_TEST_EQ( get<3>(v), std::string("s2") );
v = std::move(w1);
BOOST_TEST_EQ( v.index(), 2 );
BOOST_TEST_EQ( get<2>(v), 3.15f );
v = std::move(w2);
BOOST_TEST_EQ( v.index(), 3 );
BOOST_TEST_EQ( get<3>(v), std::string("s2") );
}
{
variant<X1, X2> v;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 0 );
v = X1{1};
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 1 );
v = X2{2};
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v).v, 2 );
X1 w1{3};
v = w1;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 3 );
X1 const w2{4};
v = w2;
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 4 );
X2 w3{5};
v = w3;
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v).v, 5 );
X2 const w4{6};
v = w4;
BOOST_TEST_EQ( v.index(), 1 );
BOOST_TEST_EQ( get<1>(v).v, 6 );
v = std::move(w1);
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 3 );
v = std::move(w2);
BOOST_TEST_EQ( v.index(), 0 );
BOOST_TEST_EQ( get<0>(v).v, 4 );
}
return boost::report_errors();
}