How to pass structure type as template argument?

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1.50/5 (2 votes)

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Something like this:

C++

template <struct T>
class Foo {

};

The class is going to load binary file and cast it onto given structure.
I found template <class T> compiling. Is this proper way?

What I have tried:

The code above, and searching google as well. Everywhere struct type was actually defined, not as I wish.

Posted 21-May-16 14:18pm

Cansisti

Updated 21-May-16 23:59pm

v2

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Comments

Sergey Alexandrovich Kryukov 21-May-16 23:17pm

Not clear. Templates are designed to avoid type cast...
—SA

[no name] 21-May-16 23:36pm

SA has made the important point. Perhaps you need to understand templates better. The template instantiation must know the typename T (which can be a structure) at compile time. Where does typecasting come into it? The question is vague and does not have proper meaning to those who may know the answer.

Cansisti 22-May-16 5:59am

Improved question, thanks

Richard MacCutchan 22-May-16 7:37am

You need to explain exactly what you want this template for. You also need to understand that templates are not used in place of casting, they are used to generate different versions of the basic code. It may well be that the solution to your problem has nothing to do with templates.

[no name] 22-May-16 9:01am

You say "The class is going to load binary file and cast it onto given structure". Sure a class can do this - now where does the template come in?

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Richard MacCutchan · Answer 1 · 2016-05-21T20:55:00

Solution 1

T is just a placeholder for the real type that will be used wherever class foo appears later in your source code. see Templates (C++)[^]

Posted 21-May-16 20:55pm

Richard MacCutchan