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 // © 2017 and later: Unicode, Inc. and others.
 // License & terms of use: http://www.unicode.org/copyright.html
 
 // umutablecptrie.h (split out of ucptrie.h)
 // created: 2018jan24 Markus W. Scherer
 
 #ifndef __UMUTABLECPTRIE_H__
 #define __UMUTABLECPTRIE_H__
 
 #include "unicode/utypes.h"
 
 #include "unicode/ucpmap.h"
 #include "unicode/ucptrie.h"
 #include "unicode/utf8.h"
 
 #if U_SHOW_CPLUSPLUS_API
 #include "unicode/localpointer.h"
 #endif   // U_SHOW_CPLUSPLUS_API
 
 U_CDECL_BEGIN
 
 /**
  * \file
  * \brief C API: This file defines a mutable Unicode code point trie.
  *
  * @see UCPTrie
  * @see UMutableCPTrie
  */
 
 /**
  * Mutable Unicode code point trie.
  * Fast map from Unicode code points (U+0000..U+10FFFF) to 32-bit integer values.
  * For details see https://icu.unicode.org/design/struct/utrie
  *
  * Setting values (especially ranges) and lookup is fast.
  * The mutable trie is only somewhat space-efficient.
  * It builds a compacted, immutable UCPTrie.
  *
  * This trie can be modified while iterating over its contents.
  * For example, it is possible to merge its values with those from another
  * set of ranges (e.g., another mutable or immutable trie):
  * Iterate over those source ranges; for each of them iterate over this trie;
  * add the source value into the value of each trie range.
  *
  * @see UCPTrie
  * @see umutablecptrie_buildImmutable
  * @stable ICU 63
  */
 typedef struct UMutableCPTrie UMutableCPTrie;
 
 /**
  * Creates a mutable trie that initially maps each Unicode code point to the same value.
  * It uses 32-bit data values until umutablecptrie_buildImmutable() is called.
  * umutablecptrie_buildImmutable() takes a valueWidth parameter which
  * determines the number of bits in the data value in the resulting UCPTrie.
  * You must umutablecptrie_close() the trie once you are done using it.
  *
  * @param initialValue the initial value that is set for all code points
  * @param errorValue the value for out-of-range code points and ill-formed UTF-8/16
  * @param pErrorCode an in/out ICU UErrorCode
  * @return the trie
  * @stable ICU 63
  */
 U_CAPI UMutableCPTrie * U_EXPORT2
 umutablecptrie_open(uint32_t initialValue, uint32_t errorValue, UErrorCode *pErrorCode);
 
 /**
  * Clones a mutable trie.
  * You must umutablecptrie_close() the clone once you are done using it.
  *
  * @param other the trie to clone
  * @param pErrorCode an in/out ICU UErrorCode
  * @return the trie clone
  * @stable ICU 63
  */
 U_CAPI UMutableCPTrie * U_EXPORT2
 umutablecptrie_clone(const UMutableCPTrie *other, UErrorCode *pErrorCode);
 
 /**
  * Closes a mutable trie and releases associated memory.
  *
  * @param trie the trie
  * @stable ICU 63
  */
 U_CAPI void U_EXPORT2
 umutablecptrie_close(UMutableCPTrie *trie);
 
 /**
  * Creates a mutable trie with the same contents as the UCPMap.
  * You must umutablecptrie_close() the mutable trie once you are done using it.
  *
  * @param map the source map
  * @param pErrorCode an in/out ICU UErrorCode
  * @return the mutable trie
  * @stable ICU 63
  */
 U_CAPI UMutableCPTrie * U_EXPORT2
 umutablecptrie_fromUCPMap(const UCPMap *map, UErrorCode *pErrorCode);
 
 /**
  * Creates a mutable trie with the same contents as the immutable one.
  * You must umutablecptrie_close() the mutable trie once you are done using it.
  *
  * @param trie the immutable trie
  * @param pErrorCode an in/out ICU UErrorCode
  * @return the mutable trie
  * @stable ICU 63
  */
 U_CAPI UMutableCPTrie * U_EXPORT2
 umutablecptrie_fromUCPTrie(const UCPTrie *trie, UErrorCode *pErrorCode);
 
 /**
  * Returns the value for a code point as stored in the trie.
  *
  * @param trie the trie
  * @param c the code point
  * @return the value
  * @stable ICU 63
  */
 U_CAPI uint32_t U_EXPORT2
 umutablecptrie_get(const UMutableCPTrie *trie, UChar32 c);
 
 /**
  * Returns the last code point such that all those from start to there have the same value.
  * Can be used to efficiently iterate over all same-value ranges in a trie.
  * (This is normally faster than iterating over code points and get()ting each value,
  * but much slower than a data structure that stores ranges directly.)
  *
  * The trie can be modified between calls to this function.
  *
  * If the UCPMapValueFilter function pointer is not NULL, then
  * the value to be delivered is passed through that function, and the return value is the end
  * of the range where all values are modified to the same actual value.
  * The value is unchanged if that function pointer is NULL.
  *
  * See the same-signature ucptrie_getRange() for a code sample.
  *
  * @param trie the trie
  * @param start range start
  * @param option defines whether surrogates are treated normally,
  *               or as having the surrogateValue; usually UCPMAP_RANGE_NORMAL
  * @param surrogateValue value for surrogates; ignored if option==UCPMAP_RANGE_NORMAL
  * @param filter a pointer to a function that may modify the trie data value,
  *     or NULL if the values from the trie are to be used unmodified
  * @param context an opaque pointer that is passed on to the filter function
  * @param pValue if not NULL, receives the value that every code point start..end has;
  *     may have been modified by filter(context, trie value)
  *     if that function pointer is not NULL
  * @return the range end code point, or -1 if start is not a valid code point
  * @stable ICU 63
  */
 U_CAPI UChar32 U_EXPORT2
 umutablecptrie_getRange(const UMutableCPTrie *trie, UChar32 start,
                         UCPMapRangeOption option, uint32_t surrogateValue,
                         UCPMapValueFilter *filter, const void *context, uint32_t *pValue);
 
 /**
  * Sets a value for a code point.
  *
  * @param trie the trie
  * @param c the code point
  * @param value the value
  * @param pErrorCode an in/out ICU UErrorCode
  * @stable ICU 63
  */
 U_CAPI void U_EXPORT2
 umutablecptrie_set(UMutableCPTrie *trie, UChar32 c, uint32_t value, UErrorCode *pErrorCode);
 
 /**
  * Sets a value for each code point [start..end].
  * Faster and more space-efficient than setting the value for each code point separately.
  *
  * @param trie the trie
  * @param start the first code point to get the value
  * @param end the last code point to get the value (inclusive)
  * @param value the value
  * @param pErrorCode an in/out ICU UErrorCode
  * @stable ICU 63
  */
 U_CAPI void U_EXPORT2
 umutablecptrie_setRange(UMutableCPTrie *trie,
                         UChar32 start, UChar32 end,
                         uint32_t value, UErrorCode *pErrorCode);
 
 /**
  * Compacts the data and builds an immutable UCPTrie according to the parameters.
  * After this, the mutable trie will be empty.
  *
  * The mutable trie stores 32-bit values until buildImmutable() is called.
  * If values shorter than 32 bits are to be stored in the immutable trie,
  * then the upper bits are discarded.
  * For example, when the mutable trie contains values 0x81, -0x7f, and 0xa581,
  * and the value width is 8 bits, then each of these is stored as 0x81
  * and the immutable trie will return that as an unsigned value.
  * (Some implementations may want to make productive temporary use of the upper bits
  * until buildImmutable() discards them.)
  *
  * Not every possible set of mappings can be built into a UCPTrie,
  * because of limitations resulting from speed and space optimizations.
  * Every Unicode assigned character can be mapped to a unique value.
  * Typical data yields data structures far smaller than the limitations.
  *
  * It is possible to construct extremely unusual mappings that exceed the data structure limits.
  * In such a case this function will fail with a U_INDEX_OUTOFBOUNDS_ERROR.
  *
  * @param trie the trie trie
  * @param type selects the trie type
  * @param valueWidth selects the number of bits in a trie data value; if smaller than 32 bits,
  *                   then the values stored in the trie will be truncated first
  * @param pErrorCode an in/out ICU UErrorCode
  *
  * @see umutablecptrie_fromUCPTrie
  * @stable ICU 63
  */
 U_CAPI UCPTrie * U_EXPORT2
 umutablecptrie_buildImmutable(UMutableCPTrie *trie, UCPTrieType type, UCPTrieValueWidth valueWidth,
                               UErrorCode *pErrorCode);
 
 U_CDECL_END
 
 #if U_SHOW_CPLUSPLUS_API
 
 U_NAMESPACE_BEGIN
 
 /**
  * \class LocalUMutableCPTriePointer
  * "Smart pointer" class, closes a UMutableCPTrie via umutablecptrie_close().
  * For most methods see the LocalPointerBase base class.
  *
  * @see LocalPointerBase
  * @see LocalPointer
  * @stable ICU 63
  */
 U_DEFINE_LOCAL_OPEN_POINTER(LocalUMutableCPTriePointer, UMutableCPTrie, umutablecptrie_close);
 
 U_NAMESPACE_END
 
 #endif
 
 #endif

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