Variadic function: Difference between revisions

Revision as of 03:27, 12 July 2006

Revision as of 03:52, 2 November 2006

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In [[PHP]], [http://php.net/functions_arguments variable-length argument lists] are natively supported (without security risk) since version 4; dedicated functions (<TT>func_num_args</TT>, <TT>func_get_arg</TT>, <TT>func_get_args</TT>) allow the programmer to determine the number and values of unspecified arguments.

The variadic function feature is going to be present in the upcoming [[C++]] language standard, [[C++0x]]; this feature is called "Variadic templates". This allows to create templates with variable number of template parameters, which can be also used to create a function with variable number of arguments:

template<typename T>

void print( const T& t )

{

std::cout << t;

}

template< typename T, typename... Args>

void print( const T& t, const Args&... args )

{

print( t );

print( args... );

}

The [[C#]] language uses different approach - they just allow that a variable number of arguments of the same type may be passed to a variadic function. Inside the function they are simply collected in an array.

==See also==