Feature spare elements #12
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This is a very early draft. method names and semantic may change.
…pare_capacity()' method
* introduces a helper union to fix simplify alignment calculations no need for cmp and phantom data anymore * add simple testcase that triggered the miri issue * change end_ptr_atomic_mut(), using the rewritten start_ptr()
These methods have the same API/Semantic than the std::Vec methods. They are useful when one wants to extend a HeaderVec in place in some complex way like for example appending chars to a u8 headervec with `encode_utf8()`
Having a HeaderVec being zero length is mostly useless because it has to reallocated instanly when anything becomes pushed. This clearly should be avoided! Nevertheless supporting zero length takes out a corner-case and a potential panic and removes the burden for users explicitly ensuring zero length HeaderVecs don't happen in practice. Generally improving software reliability.
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Note: the last commit should go into its own 'feature-std-comatibility' branch. Once #10 that got resolved and merged i will rebase the code here onto that and refactor as needed. |
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While my
atomic appendPR #10 targets appending to a shared headervec through a immutable reference (rather special use case), this implements the std vec like way using a mutable reference to a headervec using the spare capacity as a writable buffer and then completing this by readjusting the len.note: this includes all work on #10