Problems with template instantiation in C++ Post: 302353481

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Top Forums Programming Problems with template instantiation in C++ Post 302353481 by Gunther on Tuesday 15th of September 2009 12:08:11 PM

09-15-2009

Registered User

I'm sorry that I'm answering only now, have been on vacation.

Quote:

and instantiated in line 253.

What are you trying to do in line 253? Call the function? It looks like a wrongly declared function, e.g.

Code:

template istream

doesn't make any sense.
The same thing applies to the code from line 276 onwards.

If you want to instantiate the functions, which simply means calling a templated function with specific data types substituted for the template parameters, you have to pass the actual parameters as you would normally do.

A correct version of intended call starting in line 276 would look like this:

Code:

// Only because istream is a typedef of an instantiation
// of the basic_istream template, the following function
// call is correct.
/* typedef basic_istream<char, char_traits<char> > istream; */

istream& refToIstream = control
/*
    // This part (the explicit template arguments
    // specification) is superfluous, because
    // the data types can be derived from the
    // actual parameters.
    <char, char_traits<char>,                     
    <char, char_traits<char>> >
*/
// This parameters are actual parameters.
// So you must not specify their types.
(
    ...
);

Gunther

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