[PATCH] D40586: Implement p0457r2 - String Prefix and Suffix Checking

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added inline comments.


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Comment at: include/string:309
+	bool ends_with(charT c) const noexcept;
+	bool ends_with(const charT* s) const;
+
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The indentation here seems off. Should these have a `// C++2a` comment?


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Comment at: include/string:1249
+	{ return ends_with(__self_view(__s)); }
+#endif
+
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Indentation seems off here too.


================
Comment at: include/string_view:151
+	  constexpr bool ends_with(charT c) const noexcept;               // c++2a
+	  constexpr bool ends_with(const charT* s) const;                 // c++2a
+
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I think we usually capitalize the C in these comments.


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Comment at: include/string_view:577
+	bool starts_with(basic_string_view __s) const _NOEXCEPT
+	{ return size() >= __s.size() && compare(0, __s.size(), __s) == 0; }
+
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Is this a conforming implementation? The `size()` check isn't part of the specification, and `compare` could run arbitrary user-supplied code, so the absence of a call to it seems observable.

Don't get me wrong: I think this check is the right thing to do, and it only makes a difference if `traits::compare` has observable side-effects. But we should file a bug against the standard to get this check added there.


https://reviews.llvm.org/D40586