Error C2894: templates cannot be declared to have 'C' linkage

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Hi!

I'm working with Microsoft Visual C++ 6.0.
I want to I included a cs.h file in my C++ code like this:

C++

extern "C"
{
   #include "cs.h" 
}

But, when I use then I have the following error:
d:\program files\microsoft visual studio\vc98\include\math.h(514) : error C2894: templates cannot be declared to have 'C' linkage

Can anyone help?
Thanks in advance. :)

Posted 13-Aug-10 16:58pm

Xiaohu Shao

Updated 13-Aug-10 20:23pm

Sandeep Mewara

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i also have the same question !

Posted 25-Aug-11 22:53pm

boyhailong

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Aescleal · Accepted Answer · 2010-08-13T20:24:00

Doesn't the error message say it all? Your include file is including math.h which contains a template function. Templates aren't C so you can't make them extern "C".

So the big question is why do you want to stick the complete contents of an include file in an extern "C"? If the original programmer had intended his or her code to be used from a C program they'd have done that for you. As they haven't there's one of two options:

- They didn't intend it to be used from a C program
- They did intend it to be used from a C program but not have it compiled by a C++ compiler

Either way the best bet is to modify the source so it doesn't require the client programmer to hack around it.

Cheers,

Ash