================
@@ -0,0 +1,68 @@
+.. title:: clang-tidy - modernize-use-string-view
+
+modernize-use-string-view
+====================================
+
+Looks for functions returning ``std::[w|u8|u16|u32]string`` and suggests to
+change it to ``std::[...]string_view`` for performance reasons if possible.
+
+Rationale:
+
+Each time a new ``std::string`` is created from a literal, a copy of that
+literal is allocated either in ``std::string``'s internal buffer
+(for short literals) or in a heap.
+
+For the cases where ``std::string`` is returned from a function,
+such allocations can sometimes be eliminated by using ``std::string_view``
+as a return type.
+
+This check looks for such functions returning ``std::string`` baked from the
+literals and suggests replacing their return type to ``std::string_view``.
+
+It handles ``std::string``, ``std::wstring``, ``std::u8string``,
+``std::u16string`` and ``std::u32string`` along with their aliases and selects
+the proper kind of ``std::string_view`` to return.
+
+Example:
+
+Consider the following code:
+
+.. code-block:: c++
+
+ std::string foo(int i) {
+ switch(i)
+ {
+ case 1:
+ return "case 1";
+ case 2:
+ return "case 2";
+ case 3:
+ return "case 3";
+ default:
+ return "default";
+ }
+ }
----------------
vbvictor wrote:
use 2-ident for code-block (same below)
https://github.com/llvm/llvm-project/pull/172170
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