test2.cpp
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//-----------------------------------------------------------------------------
// boost-libs variant/test/test2.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/config.hpp"
#ifdef BOOST_MSVC
#pragma warning(disable:4244) // conversion from 'const int' to 'const short'
#endif
#include "boost/core/lightweight_test.hpp"
#include "boost/variant.hpp"
#include "jobs.h"
#include <cassert>
#include <iostream>
#include <algorithm>
#include <cstring>
using boost::apply_visitor;
struct short_string
{
BOOST_STATIC_CONSTANT(size_t, e_limit = 101);
short_string() : len_(0)
{
buffer_[0] = '\0';
}
short_string(const char* src)
{
#ifndef BOOST_NO_STDC_NAMESPACE
using std::strlen;
#endif // BOOST_NO_STDC_NAMESPACE
size_t limit = this->e_limit; // avoid warnings on some compilers
size_t src_len = strlen(src);
len_ = (std::min)(src_len, limit-1);
std::copy(src, src + len_, buffer_);
buffer_[len_] = '\0';
}
short_string(const short_string& other) : len_(other.len_)
{
std::copy(other.buffer_, other.buffer_ + e_limit, buffer_);
}
void swap(short_string& other)
{
char temp[e_limit];
std::copy(buffer_, buffer_ + e_limit, temp);
std::copy(other.buffer_, other.buffer_ + e_limit, buffer_);
std::copy(temp, temp + e_limit, other.buffer_);
std::swap(len_, other.len_);
}
short_string& operator=(const short_string& rhs)
{
short_string temp(rhs);
swap(temp);
return *this;
}
operator const char*() const
{
return buffer_;
}
private:
char buffer_[e_limit];
size_t len_;
}; //short_string
std::ostream& operator<<(std::ostream& out, const short_string& s)
{
out << static_cast<const char*>(s);
return out;
}
void run()
{
using boost::variant;
variant<short, short_string> v0;
variant<char, const char*> v1;
variant<short_string, char > v2;
//
// Default construction
//
verify(v0, spec<short>());
verify(v1, spec<char>());
verify(v2, spec<short_string>());
//
// Implicit conversion to bounded type
//
v1 = "I am v1";
verify(v1, spec<const char*>(), "[V] I am v1");
v2 = "I am v2";
verify(v2, spec<short_string>(), "[V] I am v2");
//
// Variant-to-variant assignment
//
v0 = v1;
verify(v0, spec<short_string>(), "[V] I am v1");
v1 = v0;
verify(v1, spec<const char*>(), "[V] I am v1");
const int n0 = 88;
v1 = n0;
v0 = v1;
//
// Implicit conversion to bounded type
//
verify(v0, spec<short>(), "[V] 88");
verify(v1, spec<char>(), "[V] X");
}
int main()
{
run();
return boost::report_errors();
}