73ef4ff3
 Hu Chunming
提交三方库
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//-----------------------------------------------------------------------------
// boost-libs variant/test/issue53.cpp source file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2019-2022 Antony Polukhin
//
// 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)
// Test case from https://github.com/boostorg/variant/issues/53
#include <boost/variant.hpp>
#include <boost/thread/lock_guard.hpp> // this line was causing problems on MSVC
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
struct spanac {};
struct ceapa{
double a,b;
};
typedef boost::variant<spanac, ceapa> var_t;
struct visitor_t : public boost::static_visitor<bool> {
bool operator() (const spanac&) const {
return true;
}
bool operator() (const ceapa&) const {
return false;
}
private:
double a, b;
};
var_t get(int k) {
if (k)
return spanac();
else
return ceapa();
}
int main(int argc, const char** argv) {
visitor_t v;
bool result = boost::apply_visitor(v, get(argc - 1));
(void)result;
}
#else // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
int main() {}
#endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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