KITFORMA · EDITORIAL ANSWER
Why does vector<int>{10, 2} contain two elements instead of ten twos?
KitForma editorial guide. Brace initialization can select the initializer-list constructor. The two numbers then describe actual elements rather than count and repeated value.
Step-by-step answer
Brace initialization can select the initializer-list constructor. The two numbers then describe actual elements rather than count and repeated value.
Use
std::vector<int> values(10, 2); when requesting ten copies. Use braces when listing elements deliberately. Review API overloads instead of applying a universal braces-everywhere rule. Similar-looking initialization syntax can communicate different operations.
Assert both size and content in a minimal fixture. This distinction matters when refactoring from parentheses to braces for style: a compiling change can alter behavior. User-defined types with initializer-list constructors can exhibit the same overload preference, so document the intended construction contract.Sources and verification
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