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extern declare in a template
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Joe
Jun 8, 2015, 10:26:23 PM6/8/15
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I've got a header that extern declares a var which is defined within a
globals.cpp. I do this for very few globals.
--- globals.h
#pragma once
extern MyGlobalClass my_gclass;
--- globals.cpp
MyGlobalClass my_gclass;
--- aclass.h
#include "globals.h"
template <class SomeClass>
class AnotherClass
{
// ...
void operator()() {
my_gclass->func(...);
}
};
The problem is that it won't compile.
aclass.h:102:29: error: 'my_gclass' was not declared in this scope
error = my_gclass->func(...
I don't understand that since the #include "globals.h" is in aclass.h.
However, if I add "extern MyGlobalClass my_gclass;" just after #include
"globals.h in the aclass.h template file, it works.
Can someone explain this?
globals.cpp. I do this for very few globals.
--- globals.h
#pragma once
extern MyGlobalClass my_gclass;
--- globals.cpp
MyGlobalClass my_gclass;
--- aclass.h
#include "globals.h"
template <class SomeClass>
class AnotherClass
{
// ...
void operator()() {
my_gclass->func(...);
}
};
The problem is that it won't compile.
aclass.h:102:29: error: 'my_gclass' was not declared in this scope
error = my_gclass->func(...
I don't understand that since the #include "globals.h" is in aclass.h.
However, if I add "extern MyGlobalClass my_gclass;" just after #include
"globals.h in the aclass.h template file, it works.
Can someone explain this?
Paavo Helde
Jun 9, 2015, 12:50:55 AM6/9/15
to
Joe <no....@noemail.com> wrote in news:ml5ir...@news3.newsguy.com:
Probably some confusion with namespaces. Or a spelling mistake, recheck
your names for silly errors like license/licence.
hth
Paavo
your names for silly errors like license/licence.
hth
Paavo
Barry Schwarz
Jun 9, 2015, 1:48:29 AM6/9/15
to
aclass.h (along with Somme trivial function definition) and see if
that works.
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