nameof_module/example/example.cpp
2018-07-13 21:06:37 +05:00

157 lines
5.4 KiB
C++

// nameof example
//
// Licensed under the MIT License <http://opensource.org/licenses/MIT>.
// Copyright (c) 2018 Daniil Goncharov <neargye@gmail.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// 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 <nameof.hpp>
#include <iostream>
#include <string>
#include <stdexcept>
constexpr long double operator"" _deg(long double deg) {
return deg * 3.141592 / 180.0;
}
std::string operator"" _string(const char* str, std::size_t) {
return std::string{str};
}
struct SomeStruct {
int somefield;
void SomeMethod1(const int i) {
somefield = i;
}
int SomeMethod2() const {
return somefield;
}
};
void SomeMethod3() {
std::cout << NAMEOF(SomeMethod3) << " no called!" << std::endl;
}
template <typename T>
void SomeMethod4() {}
struct Long {
struct LL {
int field;
};
LL ll;
};
enum class Color { RED, GREEN, BLUE };
SomeStruct somevar;
Long othervar;
int intvar;
SomeStruct* ptrvar;
SomeStruct** ptrptrvar;
int main() {
// constexpr
constexpr auto constexpr_work_fine = NAMEOF(intvar);
std::cout << constexpr_work_fine << std::endl; // intvar
// enum
std::cout << NAMEOF(Color::RED) << std::endl; // RED
// variable
std::cout << NAMEOF(somevar) << std::endl; // somevar
std::cout << NAMEOF(::somevar) << std::endl; // somevar
std::cout << NAMEOF(&somevar) << std::endl; // somevar
// member
std::cout << NAMEOF(somevar.somefield) << std::endl; // somefield
std::cout << NAMEOF((&somevar)->somefield) << std::endl; // somefield
std::cout << NAMEOF(othervar.ll.field) << std::endl; // field
// variable
std::cout << NAMEOF(ptrvar) << std::endl; // ptrvar
std::cout << NAMEOF(*ptrvar) << std::endl; // ptrvar
std::cout << NAMEOF(ptrptrvar) << std::endl; // ptrptrvar
std::cout << NAMEOF(*ptrptrvar) << std::endl; // ptrptrvar
std::cout << NAMEOF(**ptrptrvar) << std::endl; // ptrptrvar
// function
std::cout << NAMEOF(&SomeStruct::SomeMethod2) << std::endl; // SomeMethod2
std::cout << NAMEOF(SomeMethod3) << std::endl; // SomeMethod3
// type
std::cout << NAMEOF(int[]) << std::endl; // int[]
std::cout << NAMEOF(SomeStruct) << std::endl; // SomeStruct
std::cout << NAMEOF(Long::LL) << std::endl; // LL
std::cout << NAMEOF(volatile const int) << std::endl; // volatile const int
// macros
std::cout << NAMEOF(__LINE__) << std::endl; // __LINE__
std::cout << NAMEOF(__FILE__) << std::endl; // __FILE__
// full name
std::cout << NAMEOF_FULL(somevar.somefield) << std::endl; // somevar.somefield
std::cout << NAMEOF_FULL(&SomeStruct::SomeMethod2) << std::endl; // &SomeStruct::SomeMethod2
std::cout << NAMEOF_FULL(Long::LL) << std::endl; // Long::LL
std::cout << NAMEOF_FULL(std::string) << std::endl; // std::string
const auto div = [](int x, int y) -> int {
if (y == 0) {
throw std::invalid_argument(std::string(NAMEOF(y)).append(" should not be zero!"));
}
return x / y;
};
try {
const int z = div(10, 0);
std::cout << z << std::endl;
} catch (const std::exception& e) {
std::cout << e.what() << std::endl; // y should not be zero!
}
/* Remarks */
// Spaces and Tabs ignored
std::cout << NAMEOF( std::string ) << std::endl; // string
std::cout << NAMEOF( std::string ) << std::endl; // string
// Bad case
std::cout << NAMEOF("Bad case") << std::endl; // '"Bad case"'
std::cout << NAMEOF("Bad case"_string) << std::endl; // '"Bad case"_string'
std::cout << NAMEOF("somevar.somefield") << std::endl; // 'somefield"'
std::cout << NAMEOF(42.0) << std::endl; // '0'
std::cout << NAMEOF(42.f) << std::endl; // 'f'
std::cout << NAMEOF(42) << std::endl; // '42'
std::cout << NAMEOF(42.0_deg) << std::endl; // '0_deg'
std::cout << NAMEOF(std::string()) << std::endl; // 'string()'
std::cout << NAMEOF(std::string{}) << std::endl; // "string{}'
std::cout << NAMEOF(std::string{"test"}) << std::endl; // 'string{"test"}'
std::cout << NAMEOF(SomeMethod4<int>) << std::endl; // ''
std::cout << NAMEOF(ptrvar[0]) << std::endl; // 'ptrvar[0]'
std::cout << NAMEOF(intvar + intvar) << std::endl; // ' intvar'
std::cout << NAMEOF(NAMEOF(intvar)) << std::endl; // 'NAMEOF(intvar)'
std::cout << NAMEOF(std::cout << intvar << std::endl) << std::endl; // 'endl'
std::cout << NAMEOF(decltype(intvar)) << std::endl; // 'decltype(intvar)'
std::cout << NAMEOF(typeid(intvar)) << std::endl; // 'typeid(intvar)'
return 0;
}