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I first encountered files ended with .tc and .th in a C library (http://www.vlfeat.org/api/files.html, only .tc files are listed there. To see .th file, one has to download its source code http://www.vlfeat.org/download/vlfeat-0.9.5-bin.tar.gz. They are under vl directory.). Just wonder what do they mean and relation with normal .h and .c files ?
Thanks and regards!
They use those as a template and the files are not compiled directly, but by being #included in the corresponding .c or .h file after setting #defines that affect the final result.
One example is what happens in mathop_sse2.c. They include the same mathop_sse2.tc twice, but the first time FLT is defined as VL_TYPE_DOUBLE and the second time is VL_TYPE_FLOAT. That way they avoid duplicating the exact same code for different types.