Java 9 - useful commands to inspect Module

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List modules

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$ java --list-modules
$ java --list-modules java.base

Diagnostic module dependencies

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$ java -Xdiag:resolver -p mods [module name]/[class package path]
$ jar --file [jar path] --print-module-descriptor

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C++ - Class template argument deduction guide

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A deduction guide tells the compiler how to deduce template arguments when you construct an object without explicitly specifying them.

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Immediately Invoked Lambda Expression technique on initialize the singleton

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enum_cast can detect wrong case in compile time by using a constexpr with static_assert