1.. title:: clang-tidy - abseil-string-find-startswith 2 3abseil-string-find-startswith 4============================= 5 6Checks whether a ``std::string::find()`` or ``std::string::rfind()`` (and 7corresponding ``std::string_view`` methods) result is compared with 0, and 8suggests replacing with ``absl::StartsWith()``. This is both a readability and 9performance issue. 10 11``starts_with`` was added as a built-in function on those types in C++20. If 12available, prefer enabling :doc:`modernize-use-starts-ends-with 13<../modernize/use-starts-ends-with>` instead of this check. 14 15.. code-block:: c++ 16 17 string s = "..."; 18 if (s.find("Hello World") == 0) { /* do something */ } 19 if (s.rfind("Hello World", 0) == 0) { /* do something */ } 20 21becomes 22 23 24.. code-block:: c++ 25 26 string s = "..."; 27 if (absl::StartsWith(s, "Hello World")) { /* do something */ } 28 if (absl::StartsWith(s, "Hello World")) { /* do something */ } 29 30 31Options 32------- 33 34.. option:: StringLikeClasses 35 36 Semicolon-separated list of names of string-like classes. By default both 37 ``std::basic_string`` and ``std::basic_string_view`` are considered. The list 38 of methods to be considered is fixed. 39 40.. option:: IncludeStyle 41 42 A string specifying which include-style is used, `llvm` or `google`. Default 43 is `llvm`. 44 45.. option:: AbseilStringsMatchHeader 46 47 The location of Abseil's ``strings/match.h``. Defaults to 48 ``absl/strings/match.h``. 49