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ICU 77.1: icu::UCharsTrie Class Reference

Light-weight, non-const reader class for a UCharsTrie. More...

#include <ucharstrie.h>

Light-weight, non-const reader class for a UCharsTrie.

Traverses a char16_t-serialized data structure with minimal state, for mapping strings (16-bit-unit sequences) to non-negative integer values.

This class owns the serialized trie data only if it was constructed by the builder's build() method. The public constructor and the copy constructor only alias the data (only copy the pointer). There is no assignment operator.

This class is not intended for public subclassing.

Stable:

ICU 4.8

Definition at line 53 of file ucharstrie.h.

Constructs a UCharsTrie reader instance.

The trieUChars must contain a copy of a char16_t sequence from the UCharsTrieBuilder, starting with the first char16_t of that sequence. The UCharsTrie object will not read more char16_ts than the UCharsTrieBuilder generated in the corresponding build() call.

The array is not copied/cloned and must not be modified while the UCharsTrie object is in use.

Parameters

trieUChars The char16_t array that contains the serialized trie.

Stable:

ICU 4.8

Definition at line 69 of file ucharstrie.h.

Copy constructor, copies the other trie reader object and its state, but not the char16_t array which will be shared.

(Shallow copy.)

Parameters

Stable:

ICU 4.8

Definition at line 85 of file ucharstrie.h.

Determines whether the string so far matches, whether it has a value, and whether another input char16_t can continue a matching string.

Returns

The match/value Result.

Stable:

ICU 4.8

Traverses the trie from the initial state for this input char16_t.

Equivalent to reset().next(uchar).

Parameters

uchar Input char value. Values below 0 and above 0xffff will never match.

Returns

The match/value Result.

Stable:

ICU 4.8

Definition at line 200 of file ucharstrie.h.

Traverses the trie from the initial state for the one or two UTF-16 code units for this input code point.

Equivalent to reset().nextForCodePoint(cp).

Parameters

cp A Unicode code point 0..0x10ffff.

Returns

The match/value Result.

Stable:

ICU 4.8

Finds each char16_t which continues the string from the current state.

That is, each char16_t c for which it would be next(c)!=USTRINGTRIE_NO_MATCH now.

Parameters

out Each next char16_t is appended to this object.

Returns

the number of char16_ts which continue the string from here

Stable:

ICU 4.8

Returns the state of this trie as a 64-bit integer.

The state value is never 0.

Returns

opaque state value

See also

resetToState64

Stable:

ICU 65

Definition at line 108 of file ucharstrie.h.

Returns a matching string's value if called immediately after current()/first()/next() returned USTRINGTRIE_INTERMEDIATE_VALUE or USTRINGTRIE_FINAL_VALUE.

getValue() can be called multiple times.

Do not call getValue() after USTRINGTRIE_NO_MATCH or USTRINGTRIE_NO_VALUE!

Returns

The value for the string so far.

Stable:

ICU 4.8

Definition at line 258 of file ucharstrie.h.

Determines whether all strings reachable from the current state map to the same value.

Parameters

uniqueValue Receives the unique value, if this function returns true. (output-only)

Returns

true if all strings reachable from the current state map to the same value.

Stable:

ICU 4.8

Definition at line 275 of file ucharstrie.h.

Traverses the trie from the current state for this string.

Equivalent to

for(each c in s)

return result;

UStringTrieResult next(int32_t uchar)

Traverses the trie from the current state for this input char16_t.

UStringTrieResult current() const

Determines whether the string so far matches, whether it has a value, and whether another input char1...

@ USTRINGTRIE_NO_MATCH

The input unit(s) did not continue a matching string.

#define USTRINGTRIE_HAS_NEXT(result)

Equivalent to (result==USTRINGTRIE_NO_VALUE || result==USTRINGTRIE_INTERMEDIATE_VALUE) but this macro...

Parameters

s A string. Can be nullptr if length is 0. length The length of the string. Can be -1 if NUL-terminated.

Returns

The match/value Result.

Stable:

ICU 4.8

Traverses the trie from the current state for this input char16_t.

Parameters

uchar Input char value. Values below 0 and above 0xffff will never match.

Returns

The match/value Result.

Stable:

ICU 4.8

Traverses the trie from the current state for the one or two UTF-16 code units for this input code point.

Parameters

cp A Unicode code point 0..0x10ffff.

Returns

The match/value Result.

Stable:

ICU 4.8

Resets this trie to its initial state.

Returns

*this

Stable:

ICU 4.8

Definition at line 94 of file ucharstrie.h.

Resets this trie to the saved state.

If the state object contains no state, or the state of a different trie, then this trie remains unchanged.

Parameters

state The State object which holds a saved trie state.

Returns

*this

See also

saveState

reset

Stable:

ICU 4.8

Definition at line 177 of file ucharstrie.h.

Resets this trie to the saved state.

Unlike resetToState(State), the 64-bit state value must be from getState64() from the same trie object or from one initialized the exact same way. Because of no validation, this method is faster.

Parameters

Returns

*this

See also

getState64

resetToState

reset

Stable:

ICU 65

Definition at line 127 of file ucharstrie.h.

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

• common/unicode/ucharstrie.h

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