enum_tags.cpp

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/******************************************************************************
** Copyright © 2020 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
#include "stdafx.h"
 
#define BOOST_TEST_MODULE libjmmcg_tests
#include <boost/test/included/unit_test.hpp>
 
#include "core/enum_as_char_array.hpp"
 
using namespace libjmmcg;
using namespace enum_tags::mpl;
 
enum class enum_tags_as_strs : std::uint32_t {
   e4=to_tag<'1', '2', '3', '4'>::value,
   e3=to_tag<'3', '1', '4', '2'>::value,
   e2=to_tag<'3', '1', '0', '0'>::value,
   e1=to_tag<'3', '0', '0', '0'>::value
};
 
static char const str3000[]="3000";
static char const str1234[]="1234";
static std::array<char, sizeof(enum_tags_as_strs)> str3142={'3', '1', '4', '2'};
 
BOOST_AUTO_TEST_SUITE(enum_as_char_array)
 
BOOST_AUTO_TEST_CASE(dynamic_string_literal_conversiom) {
   // Slowest.
   BOOST_CHECK_EQUAL(str3000, std::string(to_array<enum_tags_as_strs, enum_tags_as_strs::e1>::value));
   // Slow.
   BOOST_CHECK(strcmp(str3000, to_array<enum_tags_as_strs, enum_tags_as_strs::e1>::value)==0);
   const auto t3=enum_tags::convert<enum_tags_as_strs>(str3000);
   // Better...
   BOOST_CHECK_EQUAL(static_cast<std::uint64_t>(t3), static_cast<std::uint64_t>(enum_tags_as_strs::e1));
   // Best!
   BOOST_CHECK(t3==enum_tags_as_strs::e1);
   const auto t1234=enum_tags::convert<enum_tags_as_strs>(str1234);
   BOOST_CHECK(t1234==enum_tags_as_strs::e4);
   const auto t3142=enum_tags::convert<enum_tags_as_strs>(str3142);
   // Super-good!
   BOOST_CHECK(t3142==enum_tags_as_strs::e3);
}
 
BOOST_AUTO_TEST_SUITE_END()