STYLE: Call the empty() member function of std containers
#469
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Ran Clang-Tidy (LLVM 11.1.0) `readability-container-size-empty`, as motivated at https://clang.llvm.org/extra/clang-tidy/checks/readability-container-size-empty.html : "The emptiness of a container should be checked using the empty() method instead of the size() method. It is not guaranteed that size() is a constant-time function, and it is generally more efficient and also shows clearer intent to use empty(). Furthermore some containers may implement the empty() method but not implement the size() method. Using empty() whenever possible makes it easier to switch to another container in the future." Got extra motivated by having my very first microsoft/STL commit on this topic: microsoft/STL@b95ba0e "Avoid calling size() in empty() member functions" (merged from pull request microsoft/STL#1836) Follows ITK pull request InsightSoftwareConsortium/ITK#414 commit InsightSoftwareConsortium/ITK@c82a5f2 "PERF: readability container size empty", Hans Johnson, January 2019.
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Ran Clang-Tidy (LLVM 11.1.0)
readability-container-size-empty, as motivated at https://clang.llvm.org/extra/clang-tidy/checks/readability-container-size-empty.html :"The emptiness of a container should be checked using the empty() method instead of the size() method. It is not guaranteed that size() is a constant-time function, and it is generally more efficient and also shows clearer intent to use empty(). Furthermore some containers may implement the empty() method but not implement the size() method. Using empty() whenever possible makes it easier to switch to another container in the future."
Got extra motivated by having my very first microsoft/STL commit on this topic: microsoft/STL@b95ba0e "Avoid calling size() in empty() member functions" (merged from pull request microsoft/STL#1836)
Follows ITK pull request InsightSoftwareConsortium/ITK#414 commit InsightSoftwareConsortium/ITK@c82a5f2 "PERF: readability container size empty", Hans Johnson, January 2019.