carb::RStringU

Defined in carb/RString.h

class RStringU : public carb::detail::RStringTraits<true>

Case-insensitive registered string.

The “U” stands for “un-cased”.

See RString for system-level information. This class differs from RString in that it performs case-insensitive operations.

Since the desire is for equality comparisons to be speed-of-light (i.e. O(1) numeric comparisons), the first string registered insensitive to casing is chosen as an “un-cased authority” and if any strings registered through RStringU later match that string (in a case-insensitive manner), that authority string will be chosen instead. This also means that when RStringU is used to register a string and then that string is retrieved with RStringU::c_str(), the casing in the returned string might not match what was registered.

Public Functions

constexpr RStringU() noexcept

Default constructor.

isEmpty() will report true.

constexpr RStringU(eRString staticString) noexcept

Initializes this registered string to one of the static pre-defined registered strings.

Parameters

staticString – The pre-defined registered string to use.

explicit RStringU(const char *str, RStringOp op = RStringOp::eRegister)

Finds or registers a new case-insensitive string.

Note

The casing of the string actually used may be different than str when reported by c_str() or toString().

Parameters

  • str – The string to find or register.

  • op – The operation to perform. If directed to RStringOp::eFindExisting and the string has not been previously registered, *this is initialized as if with the default constructor.

explicit RStringU(const char *str, size_t len, RStringOp op = RStringOp::eRegister)

Finds or registers a new counted case-insensitive string.

Note

While generally not recommended, passing len allows the given string to contain embedded NUL (‘\0’) characters.

Note

The casing of the string actually used may be different than str when reported by c_str() or toString().

Parameters

  • str – The string to find or register.

  • len – The number of characters of str to include.

  • op – The operation to perform. If directed to RStringOp::eFindExisting and the string has not been previously registered, *this is initialized as if with the default constructor.

explicit RStringU(const std::string &str, RStringOp op = RStringOp::eRegister)

Finds or registers a new case-insensitive std::string.

Note

If str contains embedded NUL (‘\0’) characters, the RString will contain the embedded NUL characters as well.

Note

The casing of the string actually used may be different than str when reported by c_str() or toString().

Parameters

  • str – The std::string to find or register.

  • op – The operation to perform. If directed to RStringOp::eFindExisting and the string has not been previously registered, *this is initialized as if with the default constructor.

explicit RStringU(const RString &other)

Converts a registered string into an “un-cased” (i.e.

case-insensitive) registered string.

Parameters

other – The RString to convert.

explicit RStringU(const RStringUKey &other)

Truncates RStringUKey into only the registered string portion.

Parameters

other – The RStringUKey to truncate.

RStringU toUncased() const noexcept

Returns a copy of this registered string.

Note

This function exists for compatibility with the RString interface.

Returns

*this since this string is already “un-cased” (i.e. case-insensitive).

RStringU truncate() const noexcept

Returns a copy of this registered string.

Note

This function exists for compatibility with the RStringKey interface.

Returns

*this since this string already has no number component.

RStringUKey toRStringKey(int32_t number = 0) const

Appends a number to the registered string to form a RStringUKey.

Parameters

number – An optional number to append (default = 0).

Returns

An RStringUKey based on *this and the provided number.

bool operator==(const RStringU &other) const noexcept

Equality comparison between this registered string and another.

Note

A case-insensitive compare is performed.

Parameters

other – Another registered string.

Returns

true if *this and other represent the same registered string; false otherwise.

bool operator!=(const RStringU &other) const noexcept

Inequality comparison between this registered string and another.

Note

A case-insensitive compare is performed.

Parameters

other – Another registered string.

Returns

false if *this and other represent the same registered string; true otherwise.

bool owner_before(const RStringU &other) const noexcept

Checks whether this registered string is stably (but not lexicographically) ordered before another registered string.

This ordering is to make registered strings usable as keys in ordered associative containers in O(1) time.

Note

This is NOT a lexicographical comparison; for that use one of the compare() functions. To reduce ambiguity between a strict ordering and lexicographical comparison there is no operator< function for this string class. While a lexicographical comparison would be O(n), this comparison is O(1).

Parameters

other – Another registered string.

Returns

true if *this should be ordered-before other; false otherwise.

bool isValid() const noexcept

Checks to see if this registered string has been corrupted.

Note

It is not possible for this registered string to become corrupted through normal use of the API. It could be caused by bad casts or use-after-free.

Returns

true if *this represents a valid registered string; false if *this is corrupted.

constexpr bool isEmpty() const noexcept

Checks to see if this registered string represents the “” (empty) value.

Returns

true if *this is default-initialized or initialized to eRString::Empty; false otherwise.

constexpr bool isUncased() const noexcept

Checks to see if this registered string represents an “un-cased” (i.e.

case-insensitive) registered string.

Returns

true if *this is “un-cased” (i.e. case-insensitive); false if case-sensitive.

constexpr uint32_t getStringId() const noexcept

Returns the registered string ID.

This ID is only useful for debugging purposes and should not be used for comparisons.

Returns

The string ID for this registered string.

size_t getHash() const

Returns the hash value as by carb::hashString(this->c_str()).

Note

This value is computed once for a registered string and cached, so this operation is generally very fast.

Returns

The hash value as computed by carb::hashString(this->c_str()).

size_t getUncasedHash() const noexcept

Returns the hash value as by carb::hashLowercaseString(this->c_str()).

Note

This value is pre-computed for registered strings and cached, so this operation is always O(1).

Returns

The hash value as computed by carb::hashLowercaseString(this->c_str()).

const char *c_str() const noexcept

Resolves this registered string to a C-style NUL-terminated string.

Note

This operation is O(1).

Returns

The C-style string previously registered.

const char *data() const noexcept

An alias for c_str(); resolves this registered string to a C-style NUL-terminated string.

Note

This operation is O(1).

Returns

The C-style string previously registered.

size_t length() const noexcept

Returns the length of the registered string.

If the string contains embedded NUL (‘\0’) characters this may differ from std::strlen(c_str()).

Note

This operation is O(1).

Returns

The length of the registered string not including the NUL terminator.

bool operator==(const RStringTraits &other) const

Equality comparison between this registered string and another.

Parameters

other – Another registered string.

Returns

true if *this and other represent the same registered string; false otherwise.

bool operator!=(const RStringTraits &other) const

Inequality comparison between this registered string and another.

Parameters

other – Another registered string.

Returns

false if *this and other represent the same registered string; true otherwise.

bool owner_before(const RStringTraits &other) const

Checks whether this registered string is stably (but not lexicographically) ordered before another registered string.

This ordering is to make registered strings usable as keys in ordered associative containers in O(1) time.

Note

This is NOT a lexicographical comparison; for that use one of the compare() functions. To reduce ambiguity between a strict ordering and lexicographical comparison there is no operator< function for this string class. While a lexicographical comparison would be O(n), this comparison is O(1).

Parameters

other – Another registered string.

Returns

true if *this should be ordered-before other; false otherwise.

int compare(const RStringTraits<OtherUncased, OtherBase> &other) const

Lexicographically compares this registered string with another.

Note

If either *this or other is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Template Parameters

OtherUncased – true if other is “un-cased” (i.e. case-insensitive); false otherwise.

Parameters

other – Another registered string to compare against.

Returns

0 if the strings are equal, >0 if other is lexicographically ordered before *this, or <0 if *this is lexicographically ordered before other. See note above regarding case-sensitivity.

int compare(const char *s) const

Lexicographically compares this registered string with a C-style string.

Note

If *this is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Parameters

s – A C-style string to compare against.

Returns

0 if the strings are equal, >0 if s is lexicographically ordered before *this, or <0 if *this is lexicographically ordered before s. See note above regarding case-sensitivity.

int compare(size_t pos, size_t count, const char *s) const

Lexicographically compares a substring of this registered string with a C-style string.

Note

If *this is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Parameters

  • pos – The starting offset of the registered string represented by *this. Must less-than-or-equal-to the length of the registered string.

  • count – The length from pos to use in the comparison. This value is automatically clamped to the end of the registered string.

  • s – A C-style string to compare against.

Returns

0 if the strings are equal, >0 if s is lexicographically ordered before the substring of *this, or <0 if the substring of *this is lexicographically ordered before s. See note above regarding case-sensitivity.

int compare(size_t pos, size_t count, const char *s, size_t len) const

Lexicographically compares a substring of this registered string with a C-style string.

Note

If *this is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Parameters

  • pos – The starting offset of the registered string represented by *this. Must less-than-or-equal-to the length of the registered string.

  • count – The length from pos to use in the comparison. This value is automatically clamped to the end of the registered string.

  • s – A C-style string to compare against.

  • len – The number of characters of s to compare against.

Returns

0 if the strings are equal, >0 if s is lexicographically ordered before the substring of *this, or <0 if the substring of *this is lexicographically ordered before s. See note above regarding case-sensitivity.

int compare(const std::string &s) const

Lexicographically compares this registered string with a string.

Note

If *this is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Parameters

s – A string to compare against.

Returns

0 if the strings are equal, >0 if s is lexicographically ordered before *this, or <0 if *this is lexicographically ordered before s. See note above regarding case-sensitivity.

int compare(size_t pos, size_t count, const std::string &s) const

Lexicographically compares a substring of this registered string with a string.

Note

If *this is “un-cased” (i.e. case-insensitive), a case-insensitive compare is performed.

Parameters

  • pos – The starting offset of the registered string represented by *this. Must less-than-or-equal-to the length of the registered string.

  • count – The length from pos to use in the comparison. This value is automatically clamped to the end of the registered string.

  • s – A string to compare against.

Returns

0 if the strings are equal, >0 if s is lexicographically ordered before the substring of *this, or <0 if the substring of *this is lexicographically ordered before s. See note above regarding case-sensitivity.

Public Static Attributes

static constexpr bool IsUncased

Constant that indicates whether this is “un-cased” (i.e.

case-insensitive).