Definitions Inline

You can use the definitions-inline organization only with member functions. Place the body of the function directly following the function declaration within the class definition.

class Class 
{
    int method() { return 3; }
};

This organization avoids repeating the prototype of the function, reduces the bulk of source files and the chance for inconsistencies. However, this organization can introduce implementation details into what would otherwise be read as an interface. You would have to do significant editing if the function became non-inline.

Use this organization only when the body of the function is trivial (that is, empty braces) or the function will always be inline.