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Terik23 2018-03-17 08:27:47 +05:00 committed by GitHub
parent dfc4677bd7
commit be8c1d7c21
1 changed files with 59 additions and 34 deletions
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nameof.cpp
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@ -9,7 +9,8 @@
// 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
// 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
@ -20,23 +21,47 @@
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// 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; }
inline constexpr const char* template_nameof_(const char* name, size_t length) {
return length == 0 ? 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 type.
#define nameof_type(typ) template_nameof_type<typ>(#typ)
template <typename T> constexpr const char* template_nameof_type(const char* name) { return name; }
// 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; }
///Used to obtain the string name of a function.
// Used to obtain the string name of a function.
#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); }
#define nameof_function(function) template_nameof_function(#function); if (false) (void)(function);
constexpr const char* template_nameof_function(const char* name) { return name; }
#include <iostream>
//example
int test = 0;
std::cout << nameof_variable(test) << " " << nameof_type(int) << std::endl;
// prints "test int”
std::string test_wrong;
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"
struct SomeStruct {
int SomeField;
void SomeMethod() { std::cout << "No called!" << std::endl; }
};
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()
}