Initialisation in Modern C++
summary
C++20 adds direct aggregate initialization using parentheses which enables perfect forwarding for aggregates so functions like make_shared and in_place_construct now accept aggregates, and it fixes aggregate use inside macros. Specific pitfalls: parenthesis init allows narrowing conversions, it does not permit brace elision, it does not extend the lifetime of temporaries, and implicit member initialization uses copy-list rules so types with explicit constructors fail unless values are provided. Empty parens perform value initialization (zero initialization) rather than aggregate initialization.
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