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std::vector<T> vec; // line #1
vec.reserve(100); // line #2
I am wondering if line #1 triggers a small allocation (say, memory for 10 Ts), or if the first allocation happens on line #2. Does the standard say anything about that?
It’s implementation defined. The default-constructor for
vectordoes not need to allocate anything, but it’s permissible for an implementation to do so.