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Add test/variant_visit_r_cx.cpp. Refs #47.

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Peter Dimov
2024-11-23 03:38:27 +02:00
parent 9061e427c2
commit bdc1098c80
2 changed files with 53 additions and 0 deletions
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test/Jamfile
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@ -141,3 +141,4 @@ compile variant_uses_double_storage.cpp ;
run variant_derived_construct2.cpp ; run variant_derived_construct2.cpp ;
compile variant_visit_cx.cpp : [ requires cxx14_constexpr ] ; compile variant_visit_cx.cpp : [ requires cxx14_constexpr ] ;
compile variant_visit_r_cx.cpp : [ requires cxx14_constexpr ] ;

52
test/variant_visit_r_cx.cpp Normal file
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@ -0,0 +1,52 @@
// Copyright 2017, 2024 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/variant2/variant.hpp>
using namespace boost::variant2;
#if !defined(BOOST_MP11_HAS_CXX14_CONSTEXPR)
#include <boost/config/pragma_message.hpp>
BOOST_PRAGMA_MESSAGE("Skipping constexpr visit test because BOOST_MP11_HAS_CXX14_CONSTEXPR is not defined")
int main() {}
#else
struct X
{
int v;
constexpr operator int() const { return v; }
};
struct F
{
template<class T> constexpr T operator()( T x ) const
{
return x;
}
};
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
int main()
{
{
constexpr variant<int> v( 1 );
STATIC_ASSERT( visit<int>( F(), v ) == 1 );
}
{
constexpr variant<char, int> v( 'a' );
STATIC_ASSERT( visit<int>( F(), v ) == 'a' );
}
{
constexpr variant<char, int, X> v( X{2} );
STATIC_ASSERT( visit<int>( F(), v ) == 2 );
}
}
#endif