The codebase needs only a few additional standard #includes to compile
against libstdc++ on Linux; presumably those headers are implicitly
included with MSVC's and Clang's standard C++ library, but even if
libstdc++ compatibility is not a goal, it is advisable to have them
included directly.
std::allocator::deallocate() expects the same value that was given
during allocate().
Interestingly, this bug did not manifest any issues (even with ASAN) on
some platforms.
This is (almost) drop-in replacement for std::vector, the main
difference is that FixedCapacityVector has a fixed (at runtime)
capacity, which makes it a lot more efficient and small for operations
like push_back();
The capacity can be set (and re-set) as usual with reserve(),
but exceeding the capacity when adding items will throw.
The capacity is also set when creating the vector with a size.
In addition a FixedCapacityVector<> instance is only 16 bytes instead
of 24 for std::vector<>.
The aim here is to reduce code bloat.
