boostorg/optional
1
0
Fork 1
mirror of https://github.com/boostorg/optional.git synced 2025-07-29 03:57:20 +02:00
Code Issues Packages Projects Releases Wiki Activity

The (in)equality comparison with boost::none does not require that T be EqualityComparable

Browse Source
This commit is contained in:
Andrzej Krzemienski
2014-04-29 22:59:06 +02:00
parent d59f47156f
commit c51f3e810b
9 changed files with 148 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

68
test/optional_test_equals_none.cpp Normal file
View File

@ -0,0 +1,68 @@
// Copyright (C) 2014 Andrzej Krzemienski.
//
// 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/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
//
// Revisions:
//
#include<iostream>
#include<stdexcept>
#include<string>
#define BOOST_ENABLE_ASSERT_HANDLER
#include "boost/bind/apply.hpp" // Included just to test proper interaction with boost::apply<> as reported by Daniel Wallin
#include "boost/mpl/bool.hpp"
#include "boost/mpl/bool_fwd.hpp" // For mpl::true_ and mpl::false_
#include "boost/optional/optional.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/none.hpp"
#include "boost/test/minimal.hpp"
#include "optional_test_common.cpp"
struct SemiRegular // no operator==
{
private: void operator==(SemiRegular const&) const {}
private: void operator!=(SemiRegular const&) const {}
};
void test_equal_to_none_of_noncomparable_T()
{
optional<SemiRegular> i = SemiRegular();
optional<SemiRegular> o;
BOOST_CHECK(i != boost::none);
BOOST_CHECK(boost::none != i);
BOOST_CHECK(o == boost::none);
BOOST_CHECK(boost::none == o);
}
int test_main( int, char* [] )
{
try
{
test_equal_to_none_of_noncomparable_T();
}
catch ( ... )
{
BOOST_ERROR("Unexpected Exception caught!");
}
return 0;
}