If i define a class like this
template <class T> class A { };
how can i use the argument when T = int(int)?
This code I have never see before, where can i find some webpage about it?
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Kerrek SB
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user1400047
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int(int) is a function type. It's the type of a function that takes one int and returns an int.
Kerrek SB
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I just don't konw how can i use the function type in class A. It can't be use like a type , just like a type parameter, and even use it like a value ,just like a non-type parameter, so why it exsits? – user1400047 Mar 04 '13 at 10:33
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2@user1400047: Ever used `std::function<>`, or `boost::function<>`? – Andy Prowl Mar 04 '13 at 10:34
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@user1400047 Can you give an example of it being used like a non-type parameter? – Joseph Mansfield Mar 04 '13 at 10:34
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@user1400047 You can do e.g. `template
class A { T *m; };`. – Angew is no longer proud of SO Mar 04 '13 at 10:39 -
@user1400047 A function signature is just a type like any other. – Alex Chamberlain Mar 04 '13 at 10:43