Detailed Description

Specifies collation options for text comparison.

See also: https://docs.mongodb.com/manual/reference/collation/; https://unicode-org.github.io/icu/userguide/collation/concepts.html

Definition at line 317 of file options.hpp.

Public Types
enum class	Strength { kPrimary = 1 , kSecondary = 2 , kTertiary = 3 , kQuaternary = 4 , kIdentical = 5 }

enum class	CaseFirst { kOff , kUpper , kLower }

enum class	Alternate { kNonIgnorable , kShifted }

enum class	MaxVariable { kPunct , kSpace }

Public Member Functions
	Collation (std::string locale)
	Creates a collation with mandatory locale.

Collation &	SetStrength (Strength strength)
	Sets the ICU collation level Default is kTertiary.

Collation &	SetCaseLevel (bool case_level)
	Sets whether to include case comparison at strength level 1 or 2 Default is false.

Collation &	SetCaseFirst (CaseFirst case_first)
	Sets sort order of case differences during tertiary level comparisons Default is kOff.

Collation &	SetNumericOrdering (bool numeric_ordering)
	Sets whether to compare numeric strings as numbers or as strings Default is false (compare as strings)

Collation &	SetAlternate (Alternate alternate)
	Sets whether collation should consider whitespace and punctuation as base characters Default is kNonIgnorable.

Collation &	SetMaxVariable (MaxVariable max_variable)
	Sets up to which characters are considered ignorable when alternate is kShifted Has no effect if alternate is kNonIgnorable.

Collation &	SetBackwards (bool backwards)
	Sets whether strings with diacritics sort from back of the string Default is false (compare from front to back)

Collation &	SetNormalization (bool normalization)
	Sets whether to check if text require normalization and perform normalization Default is false.

Member Enumeration Documentation

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Enumerator
kNonIgnorable	Whitespace and punctuation are considered base characters (default)
kShifted	Whitespace and punctuation not considered base characters.

Definition at line 341 of file options.hpp.

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Enumerator
kOff	Default value, similar to lower with slight differences.
kUpper	Uppercase sorts before lowercase.
kLower	Lowercase sorts before uppercase.

Definition at line 332 of file options.hpp.

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Enumerator
kPunct	Both whitespace and punctuation are ignorable.
kSpace	Only whitespace is ignorable.

Definition at line 348 of file options.hpp.

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Enumerator
kPrimary	Primary level of comparison (base characters only)
kSecondary	Secondary level (base characters + diacritics)
kTertiary	Tertiary level (base + diacritics + case), default.
kQuaternary	Quaternary level.
kIdentical	Identical level (tie breaker)

Definition at line 319 of file options.hpp.

The documentation for this class was generated from the following file: