codeblocks compiler error multiple function definitions

If a suitable function is found, that function is called. The compiler selects which overloaded function to invoke based on the best match among the function declarations in the current scope to the arguments supplied in the function call. Two functions that differ only in their default arguments are considered multiple definitions rather than overloaded functions.ĭefault arguments can't be supplied for overloaded operators. Therefore, it's not used in selecting overloaded functions. The default argument isn't considered part of the function type.

The preceding code shows overloads of the print function in file scope. Int print(double dvalue, int prec) // Print a double with aĭvalue = floor(dvalue / rgPow10) * Int print(double dvalue) // Print a double.

Int print(std::string s) // Print a string. The following example illustrates how you can use function overloads: // function_overloading.cpp Overloading Considerations Function declaration element The following table shows which parts of a function declaration C++ uses to differentiate between groups of functions with the same name in the same scope. You can overload both member functions and free functions. If you call print('hello world'), then the void print(std::string) overload is invoked. If you call print(42.0), then the void print(double d) function is invoked. At compile time, the compiler chooses which overload to use based on the types and number of arguments passed in by the caller. Overloading keeps you from having to use names such as print_string or print_double. This function might perform very different tasks than a function that takes an argument of type double. Overloaded functions enable you to supply different semantics for a function, depending on the types and number of its arguments.įor example, consider a print function that takes a std::string argument. These functions are called overloaded functions, or overloads.

C++ lets you specify more than one function of the same name in the same scope.

Codeblocks compiler error multiple function definitions