Default parameter of a pointer

[Patrick Kowalzick]

Dear all,

Is the default parameter for t in the function foo guaranteed to be NULL in
the case below ?
(MSVC 7.1 and g++ implements it like that)

#include <iostream>

template <typename T>
void foo(const T & t = T())
{
std::cout << t << std::endl;
}

int main()
{
foo<void*>();
return 0;
}

Thanks,
Patrick

 

[Mike Wahler]

Dear all,

Is the default parameter for t in the function foo guaranteed to be NULL in
the case below ?

Yes, if the passed argument is a pointer type.

(MSVC 7.1 and g++ implements it like that)

#include <iostream>

template <typename T>
void foo(const T & t = T())

-Mike

 

[Chris Theis]

Dear all,

Is the default parameter for t in the function foo guaranteed to be NULL in
the case below ?

Yes

[SNIP]

Cheers
Chris