CODEWITHSUNDEEP
c++templates
Mircea Ispas
Mircea Ispas

Reputation: 20780

What <void(void)> means in template arguments

I've found this code in the project I'm working:

template<typename T>
class SomeClass
{
};
typedef SomeClass<void(void)> SomeType;

What means <void(void)> construction? Can you please explain in a simple sample how a construction like this one may be used?

Upvotes: 3

Views: 312

Answers (2)

Marlon
Marlon

Reputation: 20314

T here is a type of function that returns nothing and takes no arguments.

Upvotes: 1

StoryTeller - Unslander Monica
StoryTeller - Unslander Monica

Reputation: 170055

It means that the type parameter is a function type (note, not a function pointer, but a function type) that takes no parameters, and returns no value.

You can even define function parameters in such a way:

void f (void(void));

That will decay to a function pointer when passed (just like an array parameter decays to a pointer).

Upvotes: 5

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