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#include dependencies

 
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#include dependencies, Multiple headers (both custom and standard)
Delta_Echo
post 21 Aug, 2008 - 06:20 PM
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When I create a header for use in a program, how exactly do the #include dependencies work? for example,
if I were to write a .h with a fucntion that uses Console-Out stream (cout) would I have to include the preprocessor
cpp

#include <iostream>

in the header or the main .cpp file where that header and function are used? Im just a little confused on this.
Thanks for reading smile.gif

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NickDMax
post 21 Aug, 2008 - 06:55 PM
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You actually only have to include <iostream> in the file that defines (not declares) your functions. So you do not have to put it into your custom .h unless somewhere in THAT FILE you use something requiring something inside of <iostream>.

That being said, people generally put all of the header needed by the particular .cpp file in the associated .h file. This just simplifies things. My custom mytable.cpp needs to only include mytable.h if that header file also includes all of standard libraries I want to use.

You only have to include a file once per compilation unit (c/cpp file). So long as it gets included before any of its symbols are used you are good.
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Delta_Echo
post 21 Aug, 2008 - 07:22 PM
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Thanks NickDMax :-)
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