static_string_unittest.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
 
#include <mrpt/typemeta/static_string.h>
#include <mrpt/typemeta/num_to_string.h>
#include <gtest/gtest.h>
 
using namespace mrpt::typemeta;
 
TEST(StaticString, ctor)
{
        constexpr string_literal<3> a = "foo";
        (void)(a);
 
        constexpr auto b = literal("foo");
        (void)(b);
}
 
TEST(StaticString, concat_literals)
{
        constexpr auto a = literal("foo");
        constexpr auto b = literal("bar");
        // In GCC7 these ones can be "constexpr", but that fails in MSVC 2017 (!)
        auto ab = a + b;
 
        static_assert(ab.size() == 6, "***");
        EXPECT_EQ(ab[0], 'f');
        EXPECT_EQ(ab[5], 'r');
}
 
TEST(StaticString, concat_multi)
{
        constexpr auto a = literal("foo");
        constexpr auto b = literal("bar");
        auto ab = a + b;
        auto ba = b + a;
 
        // test sstring + literal:
        auto abc = ab + literal("more");
        static_assert(abc.size() == (6 + 4), "***");
 
        // test sstring + sstring:
        auto abba = ab + ba;
        static_assert(abba.size() == 2 * 6, "***");
 
        const char* s = abba.c_str();
        (void)(s);
}
 
TEST(num_to_string, ctor)
{
        constexpr auto a = num_to_string<13>::value;
        (void)(a);
}