Solve this Error ,while using 'export' keyword in templates?

Question

Program :main.cpp

 struct X {
            int x;
           };

export template <class T> T const& min(T const&, T const&);

int main() 
 {
  return min(2, 3);
 }

x.cpp

 struct X {
    int  x; 
     };

 export template <class T> T const& min(T const &a, T const &b) {
 return a<b ? a : b;
  }

error:Compiling with gcc

 export.cpp:23: warning: keyword ‘export’ not implemented, and will be ignored
 export.cpp: In function ‘int main()’:
 export.cpp:27: error: call of overloaded ‘min(int, int)’ is ambiguous

 swap.cpp:16: warning: keyword ‘export’ not implemented, and will be ignored

error: Compiling with EDG compiler

export.cpp", line 27: error: more than one instance of overloaded function    
export.cpp", line 23: error: support for exported templates is disabled
swap.cpp", line 16: error: support for exported templates is disabled

Can anyone solve this problem?

Any one explain the usage of export keyword?

Iam working with EDG compiler also .Can say how to use in EDG — , Jul 28 '10 at 12:37

score 7 · Answer 1 · 2010-07-28T12:20:08.623

7

The export keyword is pretty useless and as far as I'm aware EDG is the only compiler to implement it. The keyword is deprecated in C++0x. So as to its usage - don't even consider it.

edited Jul 28 '10 at 12:20

answered Jul 28 '10 at 12:02

+1, EDG is the only compiler to support it and they pushed to remove it from the next standard. It is more of a problem than a solution. – David Rodríguez - dribeas Jul 28 '10 at 12:14
The export keyword isn't deprecated in C++0x; it's reserved for future use. Its previous meaning hasn't been deprecated; it's been flat out removed - an unusual single stage removal for a standard. – CB Bailey Jul 28 '10 at 12:33
@Charles I feel an SO CW question coming on "Suggest new uses for the export keyword" :-) – Jul 28 '10 at 12:49

score 2 · Accepted Answer · edited May 24 '18 at 15:08

Looks like your compiler doesn't support separate template compilation. It is a common practice not use separate compilation with templates and distribute templates in header files. Besides that, I spotted several issues.

Remove export keyword from the declaration. This should take care of call of overloaded ‘min(int, int)’ is ambiguous error message. A template may be defined as exported only once in a program.
X is defined twice. Why?

P.S. I've never seen any code which uses exported templates. A while ago, when I was learning C++, every compiler I tried did not support exported templates. No wonder it's going to be deprecated from C++.

score 0 · Answer 3 · edited May 23 '17 at 11:57

0

The export keyword has already been discussed here on SO.

edited May 23 '17 at 11:57

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answered Jul 28 '10 at 12:24

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Solve this Error ,while using 'export' keyword in templates?

3 Answers3