nameof.cpp

@@ -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.
+inline constexpr const char* template_nameof_(const char* name, size_t length) {
-#define nameof_variable(variable) template_nameof_variable(variable, #variable)
+  return length == 0 ? name
-template <typename T> constexpr const char* template_nameof_variable(const T& validate_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 type.
+// Used to obtain the string name of a type.
-#define nameof_type(typ) template_nameof_type<typ>(#typ)
+#define nameof_type(type) template_nameof_type<type>(#type)
-template <typename T> constexpr const char* template_nameof_type(const char* name) { return name; }
+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);
+#include <iostream>
-constexpr const char* template_nameof_function(const char* name) { return name; }
 
-//example
+struct SomeStruct {
-int test = 0;
+  int SomeField;
-std::cout << nameof_variable(test) << " " << nameof_type(int) << std::endl;
+  void SomeMethod() { std::cout << "No called!" << 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;
+int someVar = 0;
-// prints "static_cast<std::string>(test_wrong.c_str()) std::string"
+
+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()
+}