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Including #includes in header file vs source file


Including #includes in header file vs source file

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Including #includes in header file vs source file
Tag : cpp , By : snk
Date : January 02 2021, 06:48 AM


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C++: Including header-file fails compilation but including source cpp file compiles


Tag : cpp , By : Eniac
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Compilation fails, because you have only declared this function. Its definition is in different compilation unit, and you're not linking those two together.
Do g++ -Wall -o quartile quartile.cpp stats.cpp and it'll work.

Can't solve error with file including header that includes itself using header guards


Tag : cpp , By : mdiezb
Date : March 29 2020, 07:55 AM
With these it helps Including headers cyclically is wrong, even with include guards.
Try to remove the dependency by using forward declarations where possible.

Do I need to include system header file in the source if another header file already includes it?


Tag : c , By : turret
Date : March 29 2020, 07:55 AM
To fix this issue No.
Keep in mind that includes works like some kind of text substitution, as it's done by the preprocessor.
#include "someheader.h"

Including C header file containing standard includes (without C++11)


Tag : cpp , By : Debashree
Date : March 29 2020, 07:55 AM
it fixes the issue The problem is that the C header is polluting the preprocessor with #defines. One possibility is to clean up afterwards using #undef:
extern "C" {
#include "comm.h"
}
#undef ipc
// ...
#include "fw.h"
typedef fw::ipc::A fw_ipc_A;
extern "C" {
#include "comm.h"
}
// ...
fw_ipc_A ipc_;

Why header file sees source file's includes?


Tag : cpp , By : Hans-Inge
Date : March 29 2020, 07:55 AM
Does that help Because this source file is included after other library headers. Try moving it to the top and you'll get a compiler error.
That's what #include does - it simply copies the header file contents and pastes it to the #include location.
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