I just started learning Templates. How does the compiler know which data-types are required? Can someone please explain how compilers treat and work with templates?
When using Templates in C++ how does the compiler know how many data-types to instantiate?
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It's based on actual instantiation. If you actually declare on object using one of your templates (and any given set of parameters to it), then code will be generated. A decent compiler will generate code for exactly those configurations that you use, and none for those you do not use. I hope that explains it adequately.