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由 jsteemann 提交于
The previous memory allocation procedures tried to allocate memory via `new` or `mmap` and inserted the pointer to the memory into an std::vector afterwards. In case `new` or `mmap` threw or returned a nullptr, no memory was leaking. If `new` or `mmap` worked ok, the following `vector::push_back` could still fail and throw an exception. In this case, the memory just allocated was leaked. The fix is to reserve space in the target memory pointer block beforehand. If this throws, then no memory is allocated nor leaked. If the reserve works but the actual allocation fails, still no memory is leaked, only the target vector will have space for at least one more element than actually required (but this may be reused for the next allocation)
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