114 lines
2.5 KiB
C++
Executable File
114 lines
2.5 KiB
C++
Executable File
//-----------------------------------------------------------------------------
|
|
// boost-libs variant/test/test8.cpp header file
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (c) 2003
|
|
// Eric Friedman, Itay Maman
|
|
//
|
|
// 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/core/lightweight_test.hpp"
|
|
#include "boost/variant.hpp"
|
|
|
|
#include <iostream>
|
|
#include <vector>
|
|
#include <string>
|
|
|
|
using namespace boost;
|
|
|
|
typedef variant<float, std::string, int, std::vector<std::string> > t_var1;
|
|
|
|
struct int_sum : static_visitor<>
|
|
{
|
|
int_sum() : result_(0) { }
|
|
|
|
void operator()(int t)
|
|
{
|
|
result_ += t;
|
|
}
|
|
|
|
result_type operator()(float ) { }
|
|
result_type operator()(const std::string& ) { }
|
|
result_type operator()(const std::vector<std::string>& ) { }
|
|
|
|
int result_;
|
|
};
|
|
|
|
template <typename T, typename Variant>
|
|
T& check_pass(Variant& v, T value)
|
|
{
|
|
BOOST_TEST(get<T>(&v));
|
|
|
|
try
|
|
{
|
|
T& r = get<T>(v);
|
|
BOOST_TEST(r == value);
|
|
return r;
|
|
}
|
|
catch(boost::bad_get&)
|
|
{
|
|
throw; // must never reach
|
|
}
|
|
}
|
|
|
|
template <typename T, typename Variant>
|
|
void check_fail(Variant& v)
|
|
{
|
|
BOOST_TEST(!relaxed_get<T>(&v));
|
|
|
|
try
|
|
{
|
|
T& r = relaxed_get<T>(v);
|
|
(void)r; // suppress warning about r not being used
|
|
BOOST_TEST(false && relaxed_get<T>(&v)); // should never reach
|
|
}
|
|
catch(const boost::bad_get& e)
|
|
{
|
|
BOOST_TEST(!!e.what()); // make sure that what() is const qualified and returnes something
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
int_sum acc;
|
|
t_var1 v1 = 800;
|
|
|
|
// check get on non-const variant
|
|
{
|
|
int& r1 = check_pass<int>(v1, 800);
|
|
const int& cr1 = check_pass<const int>(v1, 800);
|
|
|
|
check_fail<float>(v1);
|
|
check_fail<const float>(v1);
|
|
check_fail<short>(v1);
|
|
check_fail<const short>(v1);
|
|
|
|
apply_visitor(acc, v1);
|
|
BOOST_TEST(acc.result_ == 800);
|
|
|
|
r1 = 920; // NOTE: modifies content of v1
|
|
apply_visitor(acc, v1);
|
|
BOOST_TEST(cr1 == 920);
|
|
BOOST_TEST(acc.result_ == 800 + 920);
|
|
}
|
|
|
|
// check const correctness:
|
|
{
|
|
const t_var1& c = v1;
|
|
|
|
check_pass<const int>(c, 920);
|
|
|
|
//check_fail<int>(c);
|
|
check_fail<const float>(c);
|
|
//check_fail<float>(c);
|
|
check_fail<const short>(c);
|
|
//check_fail<short>(c);
|
|
}
|
|
|
|
return boost::report_errors();
|
|
}
|
|
|