8.3.6 §6 The default arguments in a member function definition that appears outside of the class definition are added to the set of default arguments provided by the member function declaration in the class definition Example: class C { void f(int I = 3); void g(int i, int j = 99); }; void C::f(int I = 3) // error: default argument already { } // specified in class scope void C::g(int I = 88, int j) // in this translation unit, { } // C::g can be called with no argument end example According to the standard, it should give you an error.
8.3.6 §6 The default arguments in a member function definition that appears outside of the class definition are added to the set of default arguments provided by the member function declaration in the class definition. Example: class C { void f(int I = 3); void g(int i, int j = 99); }; void C::f(int I = 3) // error: default argument already { } // specified in class scope void C::g(int I = 88, int j) // in this translation unit, { } // C::g can be called with no argument --end example According to the standard, it should give you an error.
3 @tusbar you are quoting only part of that paragraph. It says at the start of it "Except for member functions of class templates, ...". – Johannes Schaub - litb Mar 19 '10 at 19:10 4 Interesting: C++03 differs from C++98.
What @tusbar quoted is the C++98 text, while C++03 added the exception for class templates and added to the paragraph "Default arguments for a member function of a class template shall be specified on the initial declaration of the member function within the class template. " - I suspect that this is meant to forbid default arguments in out-of-class definitions in case of members of class templates by saying that any default arguments shall be specified in-class instead of outside of the class however to me it seems unclear (does it forbid duplicates? ).
– Johannes Schaub - litb Mar 19 '10 at 19:23 1 I looked into open-std. Org/jtc1/sc22/wg21/docs/cwg_defects. Html#217 and it seems like the intention is to forbid any out-of-class default arugments for template members.
Also, I think now since the out-of-class default argument is regarded distinct from the one in-class, even if lexically identical, it violates the "shall be specified on the initial declaration" constraint. So this makes sense if you get a compile time error. The "issue 3.13" John Spicer refers to can be read in this document: open-std.Org/jtc1/sc22/wg21/docs/papers/1995/N0607.
Pdf – Johannes Schaub - litb Mar 19 '10 at 20:11.
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