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https://en.cppreference.com/w/cpp/container/vector/reserve.html https://en.cppreference.com/w/cpp/container/vector/reserve.h... says > Increase the capacity o

https://en.cppreference.com/w/cpp/container/vector/reserve.html https://en.cppreference.com/w/cpp/container/vector/reserve.h... says > Increase the capacity of the vector (the total number of elements that the vector can hold without requiring reallocation) to a value that's greater or equal to new_cap. I belive that the behaviour of reserve() is implementation defined.

tialaramex 1y ago
Because there's only a single function here, it has to either be Vec::reserve or Vec::reserve_exact If you don't offer Vec::reserve_exact then people who needed that run out of RAM and will dub your stdlib garbage. If you don't offer Vec::reserve as we've seen C++ programmers will say "Skill issue" whenever a noob gets awful performance as a result. So, it's an easy choice.
mandarax8 1y ago
That said MSVC,GCC and clang all implement it to allocate an exact value.