#define TXT1 "The", "cmake", "gui", "executable", "is", "the", "CMake", "GUI", "Project", "configuration", "settings"
#define TXT2 "The cmake-gui executable is the CMake GUI.", "Project configuration settings may be specified interactively.Brief instructions are provided at the bottom of the window when the program is running." , "CMake is a cross-platform build system generator.", "Projects specify their build process with platform - independent CMake listfiles included in each directory of a source tree with the name CMakeLists.txt.", "Users build a project by using CMake to generate a build system for a native tool on their platform."
#define TXT TXT2

int main()
{
    using namespace std;

    const int LOOPS = 10000;

    {
        cout << "concat_string: ";
        Stopwatch sw;
        for (int i = LOOPS; i > 0; --i)
        {
            string s = concat_string(TXT);
        }
    }
    {
        cout << "append new vector: ";
        Stopwatch sw;
        for (int i = LOOPS; i > 0; --i)
        {
            string s;
            vector<char*> arr = {TXT};
            for (auto str : arr)
            {
                s += str;
            }
        }
    }
    {
        cout << "append preallocated vector: ";
        Stopwatch sw;
        vector<char*> arr = {TXT};
        for (int i = LOOPS; i > 0; --i)
        {
            string s;
            for (auto str : arr)
            {
                s += str;
            }
        }
    }
    return 0;
}