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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// test_variant.cpp
// test of non-intrusive serialization of variant types
//
// copyright (c) 2005
// troy d. straszheim <troy@resophonic.com>
// http://www.resophonic.com
//
// Use, modification and distribution is subject to 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)
//
// See http://www.boost.org for updates, documentation, and revision history.
//
// thanks to Robert Ramey and Peter Dimov.
//
#include <fstream>
#include <cstdio> // remove
#include <cmath> // for fabs()
#include <boost/config.hpp>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{
using ::remove;
}
#endif
#include <boost/type_traits/is_same.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/throw_exception.hpp>
#if defined(_MSC_VER) && (_MSC_VER <= 1020)
# pragma warning (disable : 4786) // too long name, harmless warning
#endif
#include "test_tools.hpp"
#include <boost/preprocessor/stringize.hpp>
#include BOOST_PP_STRINGIZE(BOOST_ARCHIVE_TEST)
#include <boost/archive/archive_exception.hpp>
#include <boost/serialization/nvp.hpp>
#include <boost/serialization/variant.hpp>
#include "A.hpp"
class are_equal
: public boost::static_visitor<bool>
{
public:
// note extra rigamorole for compilers which don't support
// partial function template ordering - specfically msvc 6.x
struct same {
template<class T, class U>
static bool invoke(const T & t, const U & u){
return t == u;
}
};
struct not_same {
template<class T, class U>
static bool invoke(const T &, const U &){
return false;
}
};
template <class T, class U>
bool operator()( const T & t, const U & u) const
{
typedef BOOST_DEDUCED_TYPENAME boost::mpl::eval_if<boost::is_same<T, U>,
boost::mpl::identity<same>,
boost::mpl::identity<not_same>
>::type type;
return type::invoke(t, u);
}
bool operator()( const float & lhs, const float & rhs ) const
{
return std::fabs(lhs- rhs) < std::numeric_limits<float>::round_error();
}
bool operator()( const double & lhs, const double & rhs ) const
{
return std::fabs(lhs - rhs) < std::numeric_limits<float>::round_error();
}
};
template <class T>
void test_type(const T& gets_written){
const char * testfile = boost::archive::tmpnam(NULL);
BOOST_REQUIRE(testfile != NULL);
{
test_ostream os(testfile, TEST_STREAM_FLAGS);
test_oarchive oa(os);
oa << boost::serialization::make_nvp("written", gets_written);
}
T got_read;
{
test_istream is(testfile, TEST_STREAM_FLAGS);
test_iarchive ia(is);
ia >> boost::serialization::make_nvp("written", got_read);
}
BOOST_CHECK(boost::apply_visitor(are_equal(), gets_written, got_read));
std::remove(testfile);
}
// this verifies that if you try to read in a variant from a file
// whose "which" is illegal for the one in memory (that is, you're
// reading in to a different variant than you wrote out to) the load()
// operation will throw. One could concievably add checking for
// sequence length as well, but this would add size to the archive for
// dubious benefit.
//
void do_bad_read()
{
// Compiling this test invokes and ICE on msvc 6
// So, we'll just to skip it for this compiler
#if defined(_MSC_VER) && (_MSC_VER <= 1020)
boost::variant<bool, float, int, std::string> big_variant;
big_variant = std::string("adrenochrome");
const char * testfile = boost::archive::tmpnam(NULL);
BOOST_REQUIRE(testfile != NULL);
{
test_ostream os(testfile, TEST_STREAM_FLAGS);
test_oarchive oa(os);
oa << BOOST_SERIALIZATION_NVP(big_variant);
}
boost::variant<bool, float, int> little_variant;
{
test_istream is(testfile, TEST_STREAM_FLAGS);
test_iarchive ia(is);
bool exception_invoked = false;
BOOST_TRY {
ia >> BOOST_SERIALIZATION_NVP(little_variant);
} BOOST_CATCH (boost::archive::archive_exception e) {
BOOST_CHECK(boost::archive::archive_exception::unsupported_version == e.code);
exception_invoked = true;
}
BOOST_CATCH_END
BOOST_CHECK(exception_invoked);
}
#endif
}
int test_main( int /* argc */, char* /* argv */[] )
{
{
boost::variant<bool, int, float, double, A, std::string> v;
v = false;
test_type(v);
v = 1;
test_type(v);
v = (float) 2.3;
test_type(v);
v = (double) 6.4;
test_type(v);
v = std::string("we can't stop here, this is Bat Country");
test_type(v);
v = A();
test_type(v);
}
do_bad_read();
return EXIT_SUCCESS;
}
// EOF
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