GSL/tests/byte_tests.cpp

///////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
//
// This code is licensed under the MIT License (MIT).
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
///////////////////////////////////////////////////////////////////////////////

#include <UnitTest++/UnitTest++.h>
#include <gsl/gsl_byte>

#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <string>
#include <vector>

using namespace std;
using namespace gsl;

namespace
{

SUITE(byte_tests)
{
    TEST(construction)
    {
#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_STRUCT
        {
            byte b{ 4 };
            CHECK(static_cast<unsigned char>(b) == 4);
        }

        {
            byte b = byte{ 12 };
            CHECK(static_cast<unsigned char>(b) == 12);
        }
#else
        {
            byte b = static_cast<byte>(4);
            CHECK(static_cast<unsigned char>(b) == 4);
        }

        {
            byte b = byte(12);
            CHECK(static_cast<unsigned char>(b) == 12);
        }
#endif

        {
            byte b = to_byte<12>();
            CHECK(static_cast<unsigned char>(b) == 12);
        }
        {
            unsigned char uc = 12;
            byte b = to_byte(uc);
            CHECK(static_cast<unsigned char>(b) == 12);
        }

        // waiting for C++17 enum class direct initializer support
        //{
        //    byte b { 14 };
        //    CHECK(static_cast<unsigned char>(b) == 14);
        //}
    }

    int modify_both(gsl::byte * b, int* i)
    {
        *i = 10;
        *b = to_byte<5>();
        return *i;
    }

    TEST(aliasing)
    {
        int i{ 0 };
        int res = modify_both(reinterpret_cast<byte*>(&i), &i);
        CHECK(res == i);
    }

    TEST(bitwise_operations)
    {
        byte b = to_byte<0xFF>();
        byte a = to_byte<0x00>();

#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_UCHAR
        CHECK(static_cast<byte>(b | a) == to_byte<0xFF>());
#else
        CHECK((b | a) == to_byte<0xFF>());
#endif

        CHECK(a == to_byte<0x00>());

        a |= b;
        CHECK(a == to_byte<0xFF>());

        a = to_byte<0x01>();

#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_UCHAR
        CHECK(static_cast<byte>(b & a) == to_byte<0x01>());
#else
        CHECK((b & a) == to_byte<0x01>());
#endif

        a &= b;
        CHECK(a == to_byte<0x01>());

#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_UCHAR
        CHECK(static_cast<byte>(b ^ a) == to_byte<0xFE>());
#else
        CHECK((b ^ a) == to_byte<0xFE>());
#endif
        CHECK(a == to_byte<0x01>());

        a ^= b;
        CHECK(a == to_byte<0xFE>());

        a = to_byte<0x01>();
#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_UCHAR
        CHECK(static_cast<byte>(~a) == to_byte<0xFE>());
#else
        CHECK(~a == to_byte<0xFE>());
#endif

        a = to_byte<0xFF>();
#if GSL_USE_BYTE_TYPE == GSL_BYTE_TYPE_UCHAR
        CHECK(static_cast<byte>(a << 4) == to_byte<0xF0>());
        CHECK(static_cast<byte>(a >> 4) == to_byte<0x0F>());
#else
        CHECK((a << 4) == to_byte<0xF0>());
        CHECK((a >> 4) == to_byte<0x0F>());
#endif

        a <<= 4;
        CHECK(a == to_byte<0xF0>());
        a >>= 4;
        CHECK(a == to_byte<0x0F>());
    }

    TEST(to_integer)
    {
        byte b = to_byte<0x12>();

        CHECK(0x12 == gsl::to_integer<char>(b));
        CHECK(0x12 == gsl::to_integer<short>(b));
        CHECK(0x12 == gsl::to_integer<long>(b));
        CHECK(0x12 == gsl::to_integer<long long>(b));

        CHECK(0x12 == gsl::to_integer<unsigned char>(b));
        CHECK(0x12 == gsl::to_integer<unsigned short>(b));
        CHECK(0x12 == gsl::to_integer<unsigned long>(b));
        CHECK(0x12 == gsl::to_integer<unsigned long long>(b));

//      CHECK(0x12 == gsl::to_integer<float>(b));   // expect compile-time error
//      CHECK(0x12 == gsl::to_integer<double>(b));  // expect compile-time error
    }
}
}
int main(int, const char* []) { return UnitTest::RunAllTests(); }