Example: typemeta_StaticString
C++ example source code:
/* +------------------------------------------------------------------------+ | Mobile Robot Programming Toolkit (MRPT) | | https://www.mrpt.org/ | | | | Copyright (c) 2005-2024, Individual contributors, see AUTHORS file | | See: https://www.mrpt.org/Authors - All rights reserved. | | Released under BSD License. See: https://www.mrpt.org/License | +------------------------------------------------------------------------+ */ #include <mrpt/typemeta/static_string.h> #include <iostream> void Test_StaticString() { using namespace std; using namespace mrpt::typemeta; constexpr string_literal<3> s = "foo"; cout << "string_literal<3>=" << s << endl; constexpr auto a = literal("foo"); constexpr auto b = literal("bar"); // In GCC7 this can be "constexpr", but it fails in MSVC 2017 (!) auto ab = a + b; cout << "a=" << a << endl; cout << "b=" << b << endl; cout << "a+b=" << ab << endl; static_assert(ab.size() == 6, "***"); cout << "(a+b).size()=" << ab.size() << endl; cout << "(a+b)[0]=" << ab[0] << endl; cout << "(a+b)[5]=" << ab[5] << endl; } #include <mrpt/typemeta/num_to_string.h> #include <iostream> void Test_StaticNum2Str() { using namespace std; using namespace mrpt::typemeta; constexpr auto n42 = num_to_string<42>::value; constexpr auto n9999 = num_to_string<9999>::value; cout << "42 as string=" << n42 << endl; cout << "9999 as string=" << n9999 << endl; } int main(int argc, char** argv) { try { Test_StaticString(); return 0; } catch (const std::exception& e) { std::cerr << "MRPT error: " << e.what() << std::endl; return -1; } }