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Jerker · Guest

Hi all! The BCB include mechanism is truly a mystery to me. It seems
like the compiler includes header files that are not mentioned in any
#include directive.

Here is the beginning of my file Xml.cpp:

#pragma hdrstop
#include "Xml.h"
.... no more includes in this file

And here is the beginning of Xml.h:

#ifndef XML_H
#define XML_H
#include <sstream>
#include <iostream>
#include <vector>
#include <map>
#include <string>
using namespace std;
.... no more includes in this file

When I compile Xml.cpp (using Alt-F9), I get a compilation error in
another header file of the project, called Utility.h. Clearly, those
five STL include files can't have any references back to Utility.h,
which I wrote myself. So why was Utility.h included in the compilation?

(You might be wondering why I just don't correct the error in
Utility.h. The problem is that there is actually nothing wrong with
Utility.h - it compiles file when used in all units that explicitly
includes it. I asked about this problem in a post a few days ago in
this forum, but have yet to find a solution.)

Using C++Builder 6 Persona,l build 10.161.

Thanks in advance!

Jerker Hammarberg · Guest

I got around the problem by explicitly including "Utility.h" before
"Xml.h" in Xml.cpp. This means that if I DON'T include a header file, I
get a compilation error in the file that I didn't include, but if I DO
include it (although it doesn't contain any declarations that I need),
it works fine. I'm still curious for an explanation to this behaviour.

/Jerker