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[core] Add StringRef::starts_with (#18142)

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J. Nick Koston
2026-08-06 20:58:41 -05:00
committed by GitHub
parent bf95be5550
commit e58ba59288
2 changed files with 69 additions and 0 deletions
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esphome/core/string_ref.h
+7
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@@ -76,6 +76,13 @@ class StringRef {
constexpr bool empty() const { return len_ == 0; }
constexpr const_reference operator[](size_type pos) const { return *(base_ + pos); }
/// True if the view begins with the given prefix (std::string::starts_with-like)
bool starts_with(const StringRef &prefix) const {
return len_ >= prefix.len_ && std::memcmp(base_, prefix.base_, prefix.len_) == 0;
}
bool starts_with(const char *prefix) const { return this->starts_with(StringRef(prefix)); }
bool starts_with(const std::string &prefix) const { return this->starts_with(StringRef(prefix)); }
/// Copy characters to destination buffer (std::string::copy-like, but returns 0 instead of throwing on out-of-range)
size_type copy(char *dest, size_type count, size_type pos = 0) const {
if (pos >= len_)