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-rw-r--r--absl/strings/string_view.h130
1 files changed, 102 insertions, 28 deletions
diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h
index 1f14a758..968549be 100644
--- a/absl/strings/string_view.h
+++ b/absl/strings/string_view.h
@@ -62,6 +62,12 @@ ABSL_NAMESPACE_END
#define ABSL_INTERNAL_STRING_VIEW_MEMCMP memcmp
#endif // ABSL_HAVE_BUILTIN(__builtin_memcmp)
+#if defined(__cplusplus) && __cplusplus >= 201402L
+#define ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR constexpr
+#else
+#define ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR
+#endif
+
namespace absl {
ABSL_NAMESPACE_BEGIN
@@ -265,9 +271,7 @@ class string_view {
// string_view::size()
//
// Returns the number of characters in the `string_view`.
- constexpr size_type size() const noexcept {
- return length_;
- }
+ constexpr size_type size() const noexcept { return length_; }
// string_view::length()
//
@@ -334,7 +338,7 @@ class string_view {
//
// Removes the first `n` characters from the `string_view`. Note that the
// underlying string is not changed, only the view.
- void remove_prefix(size_type n) {
+ ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR void remove_prefix(size_type n) {
ABSL_HARDENING_ASSERT(n <= length_);
ptr_ += n;
length_ -= n;
@@ -344,7 +348,7 @@ class string_view {
//
// Removes the last `n` characters from the `string_view`. Note that the
// underlying string is not changed, only the view.
- void remove_suffix(size_type n) {
+ ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR void remove_suffix(size_type n) {
ABSL_HARDENING_ASSERT(n <= length_);
length_ -= n;
}
@@ -352,7 +356,7 @@ class string_view {
// string_view::swap()
//
// Swaps this `string_view` with another `string_view`.
- void swap(string_view& s) noexcept {
+ ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR void swap(string_view& s) noexcept {
auto t = *this;
*this = s;
s = t;
@@ -389,7 +393,7 @@ class string_view {
// `n`) as another string_view. This function throws `std::out_of_bounds` if
// `pos > size`.
// Use absl::ClippedSubstr if you need a truncating substr operation.
- constexpr string_view substr(size_type pos, size_type n = npos) const {
+ constexpr string_view substr(size_type pos = 0, size_type n = npos) const {
return ABSL_PREDICT_FALSE(pos > length_)
? (base_internal::ThrowStdOutOfRange(
"absl::string_view::substr"),
@@ -413,31 +417,31 @@ class string_view {
// Overload of `string_view::compare()` for comparing a substring of the
// 'string_view` and another `absl::string_view`.
- int compare(size_type pos1, size_type count1, string_view v) const {
+ constexpr int compare(size_type pos1, size_type count1, string_view v) const {
return substr(pos1, count1).compare(v);
}
// Overload of `string_view::compare()` for comparing a substring of the
// `string_view` and a substring of another `absl::string_view`.
- int compare(size_type pos1, size_type count1, string_view v, size_type pos2,
- size_type count2) const {
+ constexpr int compare(size_type pos1, size_type count1, string_view v,
+ size_type pos2, size_type count2) const {
return substr(pos1, count1).compare(v.substr(pos2, count2));
}
// Overload of `string_view::compare()` for comparing a `string_view` and a
- // a different C-style string `s`.
- int compare(const char* s) const { return compare(string_view(s)); }
+ // a different C-style string `s`.
+ constexpr int compare(const char* s) const { return compare(string_view(s)); }
// Overload of `string_view::compare()` for comparing a substring of the
// `string_view` and a different string C-style string `s`.
- int compare(size_type pos1, size_type count1, const char* s) const {
+ constexpr int compare(size_type pos1, size_type count1, const char* s) const {
return substr(pos1, count1).compare(string_view(s));
}
// Overload of `string_view::compare()` for comparing a substring of the
// `string_view` and a substring of a different C-style string `s`.
- int compare(size_type pos1, size_type count1, const char* s,
- size_type count2) const {
+ constexpr int compare(size_type pos1, size_type count1, const char* s,
+ size_type count2) const {
return substr(pos1, count1).compare(string_view(s, count2));
}
@@ -454,48 +458,92 @@ class string_view {
// within the `string_view`.
size_type find(char c, size_type pos = 0) const noexcept;
+ // Overload of `string_view::find()` for finding a substring of a different
+ // C-style string `s` within the `string_view`.
+ size_type find(const char* s, size_type pos, size_type count) const {
+ return find(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::find()` for finding a different C-style string
+ // `s` within the `string_view`.
+ size_type find(const char* s, size_type pos = 0) const {
+ return find(string_view(s), pos);
+ }
+
// string_view::rfind()
//
// Finds the last occurrence of a substring `s` within the `string_view`,
// returning the position of the first character's match, or `npos` if no
// match was found.
- size_type rfind(string_view s, size_type pos = npos) const
- noexcept;
+ size_type rfind(string_view s, size_type pos = npos) const noexcept;
// Overload of `string_view::rfind()` for finding the last given character `c`
// within the `string_view`.
size_type rfind(char c, size_type pos = npos) const noexcept;
+ // Overload of `string_view::rfind()` for finding a substring of a different
+ // C-style string `s` within the `string_view`.
+ size_type rfind(const char* s, size_type pos, size_type count) const {
+ return rfind(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::rfind()` for finding a different C-style string
+ // `s` within the `string_view`.
+ size_type rfind(const char* s, size_type pos = npos) const {
+ return rfind(string_view(s), pos);
+ }
+
// string_view::find_first_of()
//
// Finds the first occurrence of any of the characters in `s` within the
// `string_view`, returning the start position of the match, or `npos` if no
// match was found.
- size_type find_first_of(string_view s, size_type pos = 0) const
- noexcept;
+ size_type find_first_of(string_view s, size_type pos = 0) const noexcept;
// Overload of `string_view::find_first_of()` for finding a character `c`
// within the `string_view`.
- size_type find_first_of(char c, size_type pos = 0) const
- noexcept {
+ size_type find_first_of(char c, size_type pos = 0) const noexcept {
return find(c, pos);
}
+ // Overload of `string_view::find_first_of()` for finding a substring of a
+ // different C-style string `s` within the `string_view`.
+ size_type find_first_of(const char* s, size_type pos,
+ size_type count) const {
+ return find_first_of(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::find_first_of()` for finding a different C-style
+ // string `s` within the `string_view`.
+ size_type find_first_of(const char* s, size_type pos = 0) const {
+ return find_first_of(string_view(s), pos);
+ }
+
// string_view::find_last_of()
//
// Finds the last occurrence of any of the characters in `s` within the
// `string_view`, returning the start position of the match, or `npos` if no
// match was found.
- size_type find_last_of(string_view s, size_type pos = npos) const
- noexcept;
+ size_type find_last_of(string_view s, size_type pos = npos) const noexcept;
// Overload of `string_view::find_last_of()` for finding a character `c`
// within the `string_view`.
- size_type find_last_of(char c, size_type pos = npos) const
- noexcept {
+ size_type find_last_of(char c, size_type pos = npos) const noexcept {
return rfind(c, pos);
}
+ // Overload of `string_view::find_last_of()` for finding a substring of a
+ // different C-style string `s` within the `string_view`.
+ size_type find_last_of(const char* s, size_type pos, size_type count) const {
+ return find_last_of(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::find_last_of()` for finding a different C-style
+ // string `s` within the `string_view`.
+ size_type find_last_of(const char* s, size_type pos = npos) const {
+ return find_last_of(string_view(s), pos);
+ }
+
// string_view::find_first_not_of()
//
// Finds the first occurrence of any of the characters not in `s` within the
@@ -507,18 +555,43 @@ class string_view {
// that is not `c` within the `string_view`.
size_type find_first_not_of(char c, size_type pos = 0) const noexcept;
+ // Overload of `string_view::find_first_not_of()` for finding a substring of a
+ // different C-style string `s` within the `string_view`.
+ size_type find_first_not_of(const char* s, size_type pos,
+ size_type count) const {
+ return find_first_not_of(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::find_first_not_of()` for finding a different
+ // C-style string `s` within the `string_view`.
+ size_type find_first_not_of(const char* s, size_type pos = 0) const {
+ return find_first_not_of(string_view(s), pos);
+ }
+
// string_view::find_last_not_of()
//
// Finds the last occurrence of any of the characters not in `s` within the
// `string_view`, returning the start position of the last non-match, or
// `npos` if no non-match was found.
size_type find_last_not_of(string_view s,
- size_type pos = npos) const noexcept;
+ size_type pos = npos) const noexcept;
// Overload of `string_view::find_last_not_of()` for finding a character
// that is not `c` within the `string_view`.
- size_type find_last_not_of(char c, size_type pos = npos) const
- noexcept;
+ size_type find_last_not_of(char c, size_type pos = npos) const noexcept;
+
+ // Overload of `string_view::find_last_not_of()` for finding a substring of a
+ // different C-style string `s` within the `string_view`.
+ size_type find_last_not_of(const char* s, size_type pos,
+ size_type count) const {
+ return find_last_not_of(string_view(s, count), pos);
+ }
+
+ // Overload of `string_view::find_last_not_of()` for finding a different
+ // C-style string `s` within the `string_view`.
+ size_type find_last_not_of(const char* s, size_type pos = npos) const {
+ return find_last_not_of(string_view(s), pos);
+ }
private:
static constexpr size_type kMaxSize =
@@ -596,6 +669,7 @@ std::ostream& operator<<(std::ostream& o, string_view piece);
ABSL_NAMESPACE_END
} // namespace absl
+#undef ABSL_INTERNAL_STRING_VIEW_CXX14_CONSTEXPR
#undef ABSL_INTERNAL_STRING_VIEW_MEMCMP
#endif // ABSL_USES_STD_STRING_VIEW
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 05:40:42 +0000