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Kurt Krueckeberg
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 Posted: Fri Jun 27, 2003 12:32 am Post subject: Re: Must typename appear in template function's argument lis |
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| Quote: | Hi, there,
I need to write a template function that the typename does not appear
in the argument list and the return value:
//=======
template<typename C> someClass;
template<typename T> int aFunct()
{
someClass<T> aClass;
// do something with aClass here
return 0;
}
//=======
Then the function is called by another function:
//========
...
int i = aFunct<float>();
...
//========
However, the function call line does not compile (in VC++). What is
the right way to do this?
|
template<typename T> int aFunct()
{
std::vector<T> v; // not used
return 10;
}
int x = aFunct<float>();
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Matthew Towler
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| Posted: Sat Jun 28, 2003 12:46 pm Post subject: Re: Must typename appear in template function's argument lis |
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| Quote: | I need to write a template function that the typename does not appear
in the argument list and the return value:
However, the function call line does not compile (in VC++). What is
the right way to do this?
|
I am guessing you are using VC++6, in which there is a classic bug
which means such functions do not end up with different signatures
even when instantiated for multiple types, giving compilation failure.
The usual workaround is to add a dummy default parameter e.g.
template< typename T >
int foo( int, T* dummy = 0 )
{
(void)dummy); // this stops compiler warnings about the unused
parameter
}
foo<int>();
foo<MyType>()
now give different functions.
Matt
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