A look inside "filter" function defintion

novice2 sorryno at em.ail
Wed Aug 3 07:51:29 UTC 2022

leyts try very rough simlified concept:

template itself - is compile-time program (parameterizable), it 
can generate some code for you.

template instantiation (like "calling") with "!" - instruct 
compiler to "start this compile-time program here with this 

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