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Hi all, </div>
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I am new to using SCIP. I am trying to understand the Binpacking example. </div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">I have a few questions as I try to understand this example. </span></div>
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For example, in line 108 of reader_bpa.c, I see a function definition</div>
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<span style="font-family: "Courier New", monospace;">static SCIP_DECL_READERREAD(readerReadBpa)</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important">Why is the datatype of
</span><span style="font-family: "Courier New", monospace; text-align: start; background-color: rgb(255, 255, 255); display: inline !important;">readerReadBpa</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important">
or the return type of the function is not defined? Also, the function uses a variable named
</span><span style="font-family: "Courier New", monospace; text-align: start; background-color: rgb(255, 255, 255); display: inline !important;">filename</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important">,
which is neither an argument passed to the function nor is a local variable defined in the function definition. Can somebody please explain how this code still compiles? The documentation seems to not indicate the details on how this works, unfortunately.
Can somebody explain, please?</span><br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important">Secondly, I see usage of <span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">a
few SCIP-implemented functions in the code. For example, </span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIPfgets(), SCIPallocBufferArray(), SCIPfeof(), SCIPfreeBufferArray()
</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">etc. How are these different from the library standards -
</span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">fgets(), malloc/calloc(), feof(), free()</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
?</span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Thirdly,
some of the functions seem to require a </span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIP*</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
object passed in them, despite not being directly (seemingly) connected to the optimization model. For example,
</span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIPwarningMessage()</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
or </span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIPallocBufferArray()
</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">while the others like
</span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIPfeof()</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
or </span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIPfgets()</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
don't seem to require a </span><span style="font-family: "Courier New", monospace; background-color: rgb(255, 255, 255); display: inline !important;">SCIP*</span><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">
passed to the function. </span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Can
somebody kindly provide help with these questions? If not, please can somebody point me to the place where I can learn these details?</span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; text-align: start; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Thanks
and regards</span></span></div>
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Krishnan</div>
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