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Top Forums Programming Why no header file is OK for implementation? Post 303000392 by yifangt on Tuesday 11th of July 2017 12:43:33 PM
Old 07-11-2017
Why no header file is OK for implementation?

A very basic thing but quite strange to me.
There is not corresponding header file (fastq.h) for the implementation fastq.cpp which has the line: #include "fastq.h", in a package source code, but at compiling of the whole pkg I did not get any error.
There is no #indef/#endif condition. Checked the compiling process, the fastq.h was never created from the intermediate steps, or by cmake/configure or any other process.
I am quite confused whether a header file (fastq.h) is not needed for the implementation fastq.cpp, as normally the header file is must for the corresponding implementation.
Then my next question is, under which circumstance the header file is not needed?

Thanks!
 

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GJAVAH(1)								GNU								 GJAVAH(1)

NAME
gjavah - - generate header files from Java class files SYNOPSIS
gjavah ... DESCRIPTION
The gjavah program is used to generate header files from class files. It can generate both CNI and JNI header files, as well as stub implementation files which can be used as a basis for implementing the required native methods. OPTIONS
-d DIR Set output directory. -o FILE Set output file (only one of -d or -o may be used). -cmdfile FILE Read command file. -all DIR Operate on all class files under directory DIR. -stubs Emit stub implementation. -jni Emit JNI stubs or header (default). -cni Emit CNI stubs or header (default JNI). -verbose Set verbose mode. -force Output files should always be written. Class path options: -classpath PATH Set the class path. -IDIR Add directory to class path. -bootclasspath PATH Set the boot class path. -extdirs PATH Set the extension directory path. Standard options: -help Print help text, then exit. -version Print version number, then exit. -JOPTION Pass argument to the Java runtime. BUGS
SEE ALSO
javac(1), ... AUTHOR
0.98 2010-07-05 GJAVAH(1)
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