Default value for function parameter

function declaration

Code:

void gui::addMenuButton(int x, int y, string name, int parent = -1){

prototype

Code:

void addMenuButton(int x, int y, string name, int parent = -1);

And for some odd reason, I get the errors:

Code:

C:\Users\Justin\Desktop\Logic\gui.cpp|11|error: default argument given for parameter 4 of 'void gui::addMenuButton(int, int, std::string, int)'|
C:\Users\Justin\Desktop\Logic\gui.h|23|error: after previous specification in 'void gui::addMenuButton(int, int, std::string, int)'|

You should only specify the default argument in one place.

I found it good practice to specify the default parameter in the prototype and comment it out in the body:

Code:

void gui::addMenuButton(int x, int y, string name, int parent /*= -1*/){