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nameof.cpp
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//MIT License // MIT License
// //
//Copyright(c) 2016 - 2018 Terik23 // Copyright(c) 2016 - 2018 Terik23
// //
//Permission is hereby granted, free of charge, to any person obtaining a copy // Permission is hereby granted, free of charge, to any person obtaining a copy
//of this software and associated documentation files(the "Software"), to deal // of this software and associated documentation files(the "Software"), to deal
//in the Software without restriction, including without limitation the rights // in the Software without restriction, including without limitation the rights
//to use, copy, modify, merge, publish, distribute, sublicense, and/or sell // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//copies of the Software, and to permit persons to whom the Software is // copies of the Software, and to permit persons to whom the Software is
//furnished to do so, subject to the following conditions : // furnished to do so, subject to the following conditions :
// //
//The above copyright notice and this permission notice shall be included in all // The above copyright notice and this permission notice shall be included in
//copies or substantial portions of the Software. // all
// copies or substantial portions of the Software.
// //
//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
//AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // 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 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//SOFTWARE. // SOFTWARE.
///Used to obtain the string name of a variable.
#define nameof_variable(variable) template_nameof_variable(variable, #variable)
template <typename T> constexpr const char* template_nameof_variable(const T& validate_type, const char* name) { return name; }
///Used to obtain the string name of a type. inline constexpr const char* template_nameof_(const char* name, size_t length) {
#define nameof_type(typ) template_nameof_type<typ>(#typ) return length == 0 ? name
template <typename T> constexpr const char* template_nameof_type(const char* name) { return name; } : (name[length - 1] == '.' || name[length - 1] == '>' || name[length - 1] == ':')
? &name[length]
: template_nameof_(name, length - 1);
}
// Used to obtain the string name of a variable.
#define nameof_variable(variable) template_nameof_variable(variable, #variable, sizeof(#variable) / sizeof(char) - 1)
template <typename T>
inline constexpr const char* template_nameof_variable(const T& validate_type, const char* name, size_t length) { return template_nameof_(name, length); }
///Used to obtain the string name of a function. // Used to obtain the string name of a type.
#define nameof_type(type) template_nameof_type<type>(#type)
template <typename T> inline constexpr const char* template_nameof_type(const char* name) { return name; }
#define nameof_function(function) template_nameof_function(#function); if (false) (void)(function); // Used to obtain the string name of a function.
constexpr const char* template_nameof_function(const char* name) { return name; } #define nameof_function(function) template_nameof_function(#function, sizeof(#function) / sizeof(char) - 1); if (false) (void)(function);
inline constexpr const char* template_nameof_function(const char* name, size_t length) { return template_nameof_(name, length); }
//example #include <iostream>
int test = 0;
std::cout << nameof_variable(test) << " " << nameof_type(int) << std::endl; struct SomeStruct {
// prints "test int” int SomeField;
std::string test_wrong; void SomeMethod() { std::cout << "No called!" << std::endl; }
std::cout << nameof_variable(static_cast<std::string>(test_wrong.c_str())) << " " << nameof_type(std::string) << std::endl; };
// prints "static_cast<std::string>(test_wrong.c_str()) std::string"
int someVar = 0;
int main() {
SomeStruct someVar{1};
constexpr auto a = nameof_variable(someVar.SomeField);
constexpr auto b = nameof_variable((&someVar)->SomeField);
constexpr auto c = nameof_variable(someVar);
constexpr auto d = nameof_variable(::someVar);
constexpr auto e = nameof_variable(&SomeStruct::SomeMethod);
constexpr auto f = nameof_function(someVar.SomeMethod());
std::cout << a << std::endl; // SomeField
std::cout << b << std::endl; // SomeField
std::cout << c << std::endl; // someVar
std::cout << d << std::endl; // someVar
std::cout << e << std::endl; // SomeMethod
std::cout << f << std::endl; // SomeMethod()
}