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[wpiutil] StringExtras: Add substr() (#3742)

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Unlike std::string and std::string_view, this substr() allows a start
greater than the length of the string, in which case an empty string
is returned.  This matches llvm::StringRef behavior.
This commit is contained in:
Peter Johnson
2021-11-27 21:31:40 -08:00
committed by GitHub
parent 6f51cb3b98
commit ae208d2b17
18 changed files with 118 additions and 77 deletions
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15
wpiutil/src/main/native/include/wpi/SmallString.h
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@@ -181,21 +181,6 @@ public:
}
/// @}
/// @name Substring Operations
/// @{
/// Return a reference to the substring from [Start, Start + N).
///
/// \param Start The index of the starting character in the substring; if
/// the index is npos or greater than the length of the string then the
/// empty substring will be returned.
///
/// \param N The number of characters to included in the substring. If \p N
/// exceeds the number of characters remaining in the string, the string
/// suffix (starting with \p Start) will be returned.
std::string_view substr(size_t Start, size_t N = std::string_view::npos) const {
return str().substr(Start, N);
}
// Extra methods.