Hi Nakamura!
An std::map can be initialized with empty curly braces
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#include <iostream> #include <map> #include <string> void fn(std::map<int,std::string> mp = { }) { std::cout << mp.size() << std::endl; } int main() { fn({{ 4, "Hello" }}); fn(); return 0; } |
Output
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1 0 |