Improve code quality (step1. Oct)

[halx99]

THIS PROJECT IS IN DEVELOPMENT MODE. Any pull requests should merge to branch dev, otherwise will be rejected immediately

Describe your changes

ideas come from @denghe and @halx99

• resize without filled
• resize fit

Example code:

auto buf0 = std::vector<char>(128); // with zero filled and the real memory will large than required `128bytes`
auto buf1 = std::make_unique<char[]>(128); // alloc fit memory with zero filled
auto buf2 = std::make_unique_for_overwrite<char[]>(128); // alloc memory fit without zero filled.

Reference links

• resize_and_overwrite:
  • https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p1072r10.html
• boost vector resize with init behavior parameter
  • https://github.com/boostorg/container/blob/develop/include/boost/container/vector.hpp
• pod_vector
  • https://stackoverflow.com/questions/15219984/using-vectorchar-as-a-buffer-without-initializing-it-on-resize/15220853#15220853
  • https://github.com/yasio/yasio/blob/perftest/tests/perf/pod_vector.h

Issue ticket number and link

#915

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• I have checked readme and add important infos to this PR (if it needed).
• An improved cpp-test/lua-test is not needed (explain why not, thanks).

[crazyhappygame]

Do we have any benchmark to prove that those changes improve performance?

[halx99]

Do we have any benchmark to prove that those changes improve performance?

Not have yet, maybe at next step

[halx99]

Do we have any benchmark to prove that those changes improve performance?

Not have yet, maybe at next step

I have test at local:

Debug

Before:

benchmark `Animation3D_init_1` of cost: 1.827(ms)
benchmark `Animation3D_init_2` of cost: 1.759(ms)
benchmark `Animation3D_init_3` of cost: 1.499(ms)

After:

benchmark `Animation3D_init_1` of cost: 0.402(ms)
benchmark `Animation3D_init_2` of cost: 0.295(ms)
benchmark `Animation3D_init_3` of cost: 0.235(ms)

Release

Before:

benchmark `Animation3D_init_1` of cost: 0.212(ms)
benchmark `Animation3D_init_2` of cost: 0.196(ms)
benchmark `Animation3D_init_3` of cost: 0.190(ms)

After:

benchmark `Animation3D_init_1` of cost: 0.092(ms)
benchmark `Animation3D_init_2` of cost: 0.087(ms)
benchmark `Animation3D_init_3` of cost: 0.074(ms)