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Is the following code legal in C++?
void f(void* = 0)
{}
int main()
{
f();
}
Which page of the C++ standard states that this usage is legal?
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Default function parameters allow named parameters to be initialized with default values if no value or undefined is passed.
An IN OUT parameter cannot have a default value. An IN OUT actual parameter or argument must be a variable.
All the parameters of a function can be default parameters.
The default parameter is a way to set default values for function parameters a value is no passed in (ie. it is undefined ). In a function, Ii a parameter is not provided, then its value becomes undefined . In this case, the default value that we specify is applied by the compiler.
Yes, it's legal.
There is no standard wording to allow this combination of features specifically; there simply isn't any to disallow it, either.
Default argument syntax applies to function parameters in a parameter-declaration:
[C++11: 8.3.6/1]:If an initializer-clause is specified in a parameter-declaration this initializer-clause is used as a default argument. Default arguments will be used in calls where trailing arguments are missing.
...and function parameters in a parameter-declaration may be unnamed:
[C++11: 8.3.5/11]:[..] An identifier can optionally be provided as a parameter name. [..]
There is even an example of this usage under 8.3.6/4 (though examples are not normative text, so this cannot be used to prove anything concretely).
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