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Edit File : umachine.h \| Size : 13.19 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ****************************************************************************** * * Copyright (C) 1999-2015, International Business Machines * Corporation and others. All Rights Reserved. * ****************************************************************************** * file name: umachine.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 1999sep13 * created by: Markus W. Scherer * * This file defines basic types and constants for ICU to be * platform-independent. umachine.h and utf.h are included into * utypes.h to provide all the general definitions for ICU. * All of these definitions used to be in utypes.h before * the UTF-handling macros made this unmaintainable. / #ifndef __UMACHINE_H__ #define __UMACHINE_H__ /* * \file * \brief Basic types and constants for UTF * * <h2> Basic types and constants for UTF </h2> * This file defines basic types and constants for utf.h to be * platform-independent. umachine.h and utf.h are included into * utypes.h to provide all the general definitions for ICU. * All of these definitions used to be in utypes.h before * the UTF-handling macros made this unmaintainable. * / /==========================================================================/ / Include platform-dependent definitions / / which are contained in the platform-specific file platform.h / /==========================================================================/ #include "unicode/ptypes.h" / platform.h is included in ptypes.h / / * ANSI C headers: * stddef.h defines wchar_t / #include <stddef.h> /==========================================================================/ / For C wrappers, we use the symbol U_STABLE. / / This works properly if the includer is C or C++. / / Functions are declared U_STABLE return-type U_EXPORT2 function-name()... / /==========================================================================/ /* * \def U_CFUNC * This is used in a declaration of a library private ICU C function. * @stable ICU 2.4 / /* * \def U_CDECL_BEGIN * This is used to begin a declaration of a library private ICU C API. * @stable ICU 2.4 / /* * \def U_CDECL_END * This is used to end a declaration of a library private ICU C API * @stable ICU 2.4 / #ifdef __cplusplus # define U_CFUNC extern "C" # define U_CDECL_BEGIN extern "C" { # define U_CDECL_END } #else # define U_CFUNC extern # define U_CDECL_BEGIN # define U_CDECL_END #endif #ifndef U_ATTRIBUTE_DEPRECATED /* * \def U_ATTRIBUTE_DEPRECATED * This is used for GCC specific attributes * @internal / #if U_GCC_MAJOR_MINOR >= 302 # define U_ATTRIBUTE_DEPRECATED __attribute__ ((deprecated)) /* * \def U_ATTRIBUTE_DEPRECATED * This is used for Visual C++ specific attributes * @internal / #elif defined(_MSC_VER) && (_MSC_VER >= 1400) # define U_ATTRIBUTE_DEPRECATED __declspec(deprecated) #else # define U_ATTRIBUTE_DEPRECATED #endif #endif /* This is used to declare a function as a public ICU C API @stable ICU 2.0/ #define U_CAPI U_CFUNC U_EXPORT /* This is used to declare a function as a stable public ICU C API/ #define U_STABLE U_CAPI /* This is used to declare a function as a draft public ICU C API / #define U_DRAFT U_CAPI /* This is used to declare a function as a deprecated public ICU C API / #define U_DEPRECATED U_CAPI U_ATTRIBUTE_DEPRECATED /* This is used to declare a function as an obsolete public ICU C API / #define U_OBSOLETE U_CAPI /* This is used to declare a function as an internal ICU C API / #define U_INTERNAL U_CAPI /* * \def U_OVERRIDE * Defined to the C++11 "override" keyword if available. * Denotes a class or member which is an override of the base class. * May result in an error if it applied to something not an override. * @internal / #ifndef U_OVERRIDE #define U_OVERRIDE override #endif /* * \def U_FINAL * Defined to the C++11 "final" keyword if available. * Denotes a class or member which may not be overridden in subclasses. * May result in an error if subclasses attempt to override. * @internal / #if !defined(U_FINAL) \|\| defined(U_IN_DOXYGEN) #define U_FINAL final #endif /==========================================================================/ / limits for int32_t etc., like in POSIX inttypes.h / /==========================================================================/ #ifndef INT8_MIN /* The smallest value an 8 bit signed integer can hold @stable ICU 2.0 / # define INT8_MIN ((int8_t)(-128)) #endif #ifndef INT16_MIN /* The smallest value a 16 bit signed integer can hold @stable ICU 2.0 / # define INT16_MIN ((int16_t)(-32767-1)) #endif #ifndef INT32_MIN /* The smallest value a 32 bit signed integer can hold @stable ICU 2.0 / # define INT32_MIN ((int32_t)(-2147483647-1)) #endif #ifndef INT8_MAX /* The largest value an 8 bit signed integer can hold @stable ICU 2.0 / # define INT8_MAX ((int8_t)(127)) #endif #ifndef INT16_MAX /* The largest value a 16 bit signed integer can hold @stable ICU 2.0 / # define INT16_MAX ((int16_t)(32767)) #endif #ifndef INT32_MAX /* The largest value a 32 bit signed integer can hold @stable ICU 2.0 / # define INT32_MAX ((int32_t)(2147483647)) #endif #ifndef UINT8_MAX /* The largest value an 8 bit unsigned integer can hold @stable ICU 2.0 / # define UINT8_MAX ((uint8_t)(255U)) #endif #ifndef UINT16_MAX /* The largest value a 16 bit unsigned integer can hold @stable ICU 2.0 / # define UINT16_MAX ((uint16_t)(65535U)) #endif #ifndef UINT32_MAX /* The largest value a 32 bit unsigned integer can hold @stable ICU 2.0 / # define UINT32_MAX ((uint32_t)(4294967295U)) #endif #if defined(U_INT64_T_UNAVAILABLE) # error int64_t is required for decimal format and rule-based number format. #else # ifndef INT64_C /* * Provides a platform independent way to specify a signed 64-bit integer constant. * note: may be wrong for some 64 bit platforms - ensure your compiler provides INT64_C * @stable ICU 2.8 / # define INT64_C(c) c ## LL # endif # ifndef UINT64_C /* * Provides a platform independent way to specify an unsigned 64-bit integer constant. * note: may be wrong for some 64 bit platforms - ensure your compiler provides UINT64_C * @stable ICU 2.8 / # define UINT64_C(c) c ## ULL # endif # ifndef U_INT64_MIN /* The smallest value a 64 bit signed integer can hold @stable ICU 2.8 / # define U_INT64_MIN ((int64_t)(INT64_C(-9223372036854775807)-1)) # endif # ifndef U_INT64_MAX /* The largest value a 64 bit signed integer can hold @stable ICU 2.8 / # define U_INT64_MAX ((int64_t)(INT64_C(9223372036854775807))) # endif # ifndef U_UINT64_MAX /* The largest value a 64 bit unsigned integer can hold @stable ICU 2.8 / # define U_UINT64_MAX ((uint64_t)(UINT64_C(18446744073709551615))) # endif #endif /==========================================================================/ / Boolean data type / /==========================================================================/ /* The ICU boolean type @stable ICU 2.0 / typedef int8_t UBool; #ifndef TRUE /* The TRUE value of a UBool @stable ICU 2.0 / # define TRUE 1 #endif #ifndef FALSE /* The FALSE value of a UBool @stable ICU 2.0 / # define FALSE 0 #endif /==========================================================================/ / Unicode data types / /==========================================================================/ / wchar_t-related definitions -------------------------------------------- / / * \def U_WCHAR_IS_UTF16 * Defined if wchar_t uses UTF-16. * * @stable ICU 2.0 / / * \def U_WCHAR_IS_UTF32 * Defined if wchar_t uses UTF-32. * * @stable ICU 2.0 / #if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32) # ifdef __STDC_ISO_10646__ # if (U_SIZEOF_WCHAR_T==2) # define U_WCHAR_IS_UTF16 # elif (U_SIZEOF_WCHAR_T==4) # define U_WCHAR_IS_UTF32 # endif # elif defined __UCS2__ # if (U_PF_OS390 <= U_PLATFORM && U_PLATFORM <= U_PF_OS400) && (U_SIZEOF_WCHAR_T==2) # define U_WCHAR_IS_UTF16 # endif # elif defined(__UCS4__) \|\| (U_PLATFORM == U_PF_OS400 && defined(__UTF32__)) # if (U_SIZEOF_WCHAR_T==4) # define U_WCHAR_IS_UTF32 # endif # elif U_PLATFORM_IS_DARWIN_BASED \|\| (U_SIZEOF_WCHAR_T==4 && U_PLATFORM_IS_LINUX_BASED) # define U_WCHAR_IS_UTF32 # elif U_PLATFORM_HAS_WIN32_API # define U_WCHAR_IS_UTF16 # endif #endif / UChar and UChar32 definitions -------------------------------------------- / /* Number of bytes in a UChar. @stable ICU 2.0 / #define U_SIZEOF_UCHAR 2 /* * \def U_CHAR16_IS_TYPEDEF * If 1, then char16_t is a typedef and not a real type (yet) * @internal / #if (U_PLATFORM == U_PF_AIX) && defined(__cplusplus) &&(U_CPLUSPLUS_VERSION < 11) // for AIX, uchar.h needs to be included # include <uchar.h> # define U_CHAR16_IS_TYPEDEF 1 #elif defined(_MSC_VER) && (_MSC_VER < 1900) // Versions of Visual Studio/MSVC below 2015 do not support char16_t as a real type, // and instead use a typedef. https://msdn.microsoft.com/library/bb531344.aspx # define U_CHAR16_IS_TYPEDEF 1 #else # define U_CHAR16_IS_TYPEDEF 0 #endif /* * \var UChar * * The base type for UTF-16 code units and pointers. * Unsigned 16-bit integer. * Starting with ICU 59, C++ API uses char16_t directly, while C API continues to use UChar. * * UChar is configurable by defining the macro UCHAR_TYPE * on the preprocessor or compiler command line: * -DUCHAR_TYPE=uint16_t or -DUCHAR_TYPE=wchar_t (if U_SIZEOF_WCHAR_T==2) etc. * (The UCHAR_TYPE can also be \#defined earlier in this file, for outside the ICU library code.) * This is for transitional use from application code that uses uint16_t or wchar_t for UTF-16. * * The default is UChar=char16_t. * * C++11 defines char16_t as bit-compatible with uint16_t, but as a distinct type. * * In C, char16_t is a simple typedef of uint_least16_t. * ICU requires uint_least16_t=uint16_t for data memory mapping. * On macOS, char16_t is not available because the uchar.h standard header is missing. * * @stable ICU 4.4 / #if 1 // #if 1 is normal. UChar defaults to char16_t in C++. // For configuration testing of UChar=uint16_t temporarily change this to #if 0. // The intltest Makefile #defines UCHAR_TYPE=char16_t, // so we only #define it to uint16_t if it is undefined so far. #elif !defined(UCHAR_TYPE) # define UCHAR_TYPE uint16_t #endif #if defined(U_COMBINED_IMPLEMENTATION) \|\| defined(U_COMMON_IMPLEMENTATION) \|\| \ defined(U_I18N_IMPLEMENTATION) \|\| defined(U_IO_IMPLEMENTATION) // Inside the ICU library code, never configurable. typedef char16_t UChar; #elif defined(UCHAR_TYPE) typedef UCHAR_TYPE UChar; #elif defined(__cplusplus) typedef char16_t UChar; #else typedef uint16_t UChar; #endif /* * \var OldUChar * Default ICU 58 definition of UChar. * A base type for UTF-16 code units and pointers. * Unsigned 16-bit integer. * * Define OldUChar to be wchar_t if that is 16 bits wide. * If wchar_t is not 16 bits wide, then define UChar to be uint16_t. * * This makes the definition of OldUChar platform-dependent * but allows direct string type compatibility with platforms with * 16-bit wchar_t types. * * This is how UChar was defined in ICU 58, for transition convenience. * Exception: ICU 58 UChar was defined to UCHAR_TYPE if that macro was defined. * The current UChar responds to UCHAR_TYPE but OldUChar does not. * * @stable ICU 59 / #if U_SIZEOF_WCHAR_T==2 typedef wchar_t OldUChar; #elif defined(__CHAR16_TYPE__) typedef __CHAR16_TYPE__ OldUChar; #else typedef uint16_t OldUChar; #endif /* * Define UChar32 as a type for single Unicode code points. * UChar32 is a signed 32-bit integer (same as int32_t). * * The Unicode code point range is 0..0x10ffff. * All other values (negative or >=0x110000) are illegal as Unicode code points. * They may be used as sentinel values to indicate "done", "error" * or similar non-code point conditions. * * Before ICU 2.4 (Jitterbug 2146), UChar32 was defined * to be wchar_t if that is 32 bits wide (wchar_t may be signed or unsigned) * or else to be uint32_t. * That is, the definition of UChar32 was platform-dependent. * * @see U_SENTINEL * @stable ICU 2.4 / typedef int32_t UChar32; /* * This value is intended for sentinel values for APIs that * (take or) return single code points (UChar32). * It is outside of the Unicode code point range 0..0x10ffff. * * For example, a "done" or "error" value in a new API * could be indicated with U_SENTINEL. * * ICU APIs designed before ICU 2.4 usually define service-specific "done" * values, mostly 0xffff. * Those may need to be distinguished from * actual U+ffff text contents by calling functions like * CharacterIterator::hasNext() or UnicodeString::length(). * * @return -1 * @see UChar32 * @stable ICU 2.4 */ #define U_SENTINEL (-1) #include "unicode/urename.h" #endif Back

Edit File : umachine.h | Size : 13.19 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
*
*   Copyright (C) 1999-2015, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
******************************************************************************
*   file name:  umachine.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 1999sep13
*   created by: Markus W. Scherer
*
*   This file defines basic types and constants for ICU to be
*   platform-independent. umachine.h and utf.h are included into
*   utypes.h to provide all the general definitions for ICU.
*   All of these definitions used to be in utypes.h before
*   the UTF-handling macros made this unmaintainable.
*/

#ifndef __UMACHINE_H__
#define __UMACHINE_H__

/**
 * \file
 * \brief Basic types and constants for UTF
 *
 * <h2> Basic types and constants for UTF </h2>
 *   This file defines basic types and constants for utf.h to be
 *   platform-independent. umachine.h and utf.h are included into
 *   utypes.h to provide all the general definitions for ICU.
 *   All of these definitions used to be in utypes.h before
 *   the UTF-handling macros made this unmaintainable.
 *
 */
/*==========================================================================*/
/* Include platform-dependent definitions                                   */
/* which are contained in the platform-specific file platform.h             */
/*==========================================================================*/

#include "unicode/ptypes.h" /* platform.h is included in ptypes.h */

/*
 * ANSI C headers:
 * stddef.h defines wchar_t
 */
#include <stddef.h>

/*==========================================================================*/
/* For C wrappers, we use the symbol U_STABLE.                                */
/* This works properly if the includer is C or C++.                         */
/* Functions are declared   U_STABLE return-type U_EXPORT2 function-name()... */
/*==========================================================================*/

/**
 * \def U_CFUNC
 * This is used in a declaration of a library private ICU C function.
 * @stable ICU 2.4
 */

/**
 * \def U_CDECL_BEGIN
 * This is used to begin a declaration of a library private ICU C API.
 * @stable ICU 2.4
 */

/**
 * \def U_CDECL_END
 * This is used to end a declaration of a library private ICU C API
 * @stable ICU 2.4
 */

#ifdef __cplusplus
#   define U_CFUNC extern "C"
#   define U_CDECL_BEGIN extern "C" {
#   define U_CDECL_END   }
#else
#   define U_CFUNC extern
#   define U_CDECL_BEGIN
#   define U_CDECL_END
#endif

#ifndef U_ATTRIBUTE_DEPRECATED
/**
 * \def U_ATTRIBUTE_DEPRECATED
 *  This is used for GCC specific attributes
 * @internal
 */
#if U_GCC_MAJOR_MINOR >= 302
#    define U_ATTRIBUTE_DEPRECATED __attribute__ ((deprecated))
/**
 * \def U_ATTRIBUTE_DEPRECATED
 * This is used for Visual C++ specific attributes 
 * @internal
 */
#elif defined(_MSC_VER) && (_MSC_VER >= 1400)
#    define U_ATTRIBUTE_DEPRECATED __declspec(deprecated)
#else
#    define U_ATTRIBUTE_DEPRECATED
#endif
#endif

/** This is used to declare a function as a public ICU C API @stable ICU 2.0*/
#define U_CAPI U_CFUNC U_EXPORT
/** This is used to declare a function as a stable public ICU C API*/
#define U_STABLE U_CAPI
/** This is used to declare a function as a draft public ICU C API  */
#define U_DRAFT  U_CAPI
/** This is used to declare a function as a deprecated public ICU C API  */
#define U_DEPRECATED U_CAPI U_ATTRIBUTE_DEPRECATED
/** This is used to declare a function as an obsolete public ICU C API  */
#define U_OBSOLETE U_CAPI
/** This is used to declare a function as an internal ICU C API  */
#define U_INTERNAL U_CAPI

/**
 * \def U_OVERRIDE
 * Defined to the C++11 "override" keyword if available.
 * Denotes a class or member which is an override of the base class.
 * May result in an error if it applied to something not an override.
 * @internal
 */
#ifndef U_OVERRIDE
#define U_OVERRIDE override
#endif

/**
 * \def U_FINAL
 * Defined to the C++11 "final" keyword if available.
 * Denotes a class or member which may not be overridden in subclasses.
 * May result in an error if subclasses attempt to override.
 * @internal
 */
#if !defined(U_FINAL) || defined(U_IN_DOXYGEN)
#define U_FINAL final
#endif

/*==========================================================================*/
/* limits for int32_t etc., like in POSIX inttypes.h                        */
/*==========================================================================*/

#ifndef INT8_MIN
/** The smallest value an 8 bit signed integer can hold @stable ICU 2.0 */
#   define INT8_MIN        ((int8_t)(-128))
#endif
#ifndef INT16_MIN
/** The smallest value a 16 bit signed integer can hold @stable ICU 2.0 */
#   define INT16_MIN       ((int16_t)(-32767-1))
#endif
#ifndef INT32_MIN
/** The smallest value a 32 bit signed integer can hold @stable ICU 2.0 */
#   define INT32_MIN       ((int32_t)(-2147483647-1))
#endif

#ifndef INT8_MAX
/** The largest value an 8 bit signed integer can hold @stable ICU 2.0 */
#   define INT8_MAX        ((int8_t)(127))
#endif
#ifndef INT16_MAX
/** The largest value a 16 bit signed integer can hold @stable ICU 2.0 */
#   define INT16_MAX       ((int16_t)(32767))
#endif
#ifndef INT32_MAX
/** The largest value a 32 bit signed integer can hold @stable ICU 2.0 */
#   define INT32_MAX       ((int32_t)(2147483647))
#endif

#ifndef UINT8_MAX
/** The largest value an 8 bit unsigned integer can hold @stable ICU 2.0 */
#   define UINT8_MAX       ((uint8_t)(255U))
#endif
#ifndef UINT16_MAX
/** The largest value a 16 bit unsigned integer can hold @stable ICU 2.0 */
#   define UINT16_MAX      ((uint16_t)(65535U))
#endif
#ifndef UINT32_MAX
/** The largest value a 32 bit unsigned integer can hold @stable ICU 2.0 */
#   define UINT32_MAX      ((uint32_t)(4294967295U))
#endif

#if defined(U_INT64_T_UNAVAILABLE)
# error int64_t is required for decimal format and rule-based number format.
#else
# ifndef INT64_C
/**
 * Provides a platform independent way to specify a signed 64-bit integer constant.
 * note: may be wrong for some 64 bit platforms - ensure your compiler provides INT64_C
 * @stable ICU 2.8
 */
#   define INT64_C(c) c ## LL
# endif
# ifndef UINT64_C
/**
 * Provides a platform independent way to specify an unsigned 64-bit integer constant.
 * note: may be wrong for some 64 bit platforms - ensure your compiler provides UINT64_C
 * @stable ICU 2.8
 */
#   define UINT64_C(c) c ## ULL
# endif
# ifndef U_INT64_MIN
/** The smallest value a 64 bit signed integer can hold @stable ICU 2.8 */
#     define U_INT64_MIN       ((int64_t)(INT64_C(-9223372036854775807)-1))
# endif
# ifndef U_INT64_MAX
/** The largest value a 64 bit signed integer can hold @stable ICU 2.8 */
#     define U_INT64_MAX       ((int64_t)(INT64_C(9223372036854775807)))
# endif
# ifndef U_UINT64_MAX
/** The largest value a 64 bit unsigned integer can hold @stable ICU 2.8 */
#     define U_UINT64_MAX      ((uint64_t)(UINT64_C(18446744073709551615)))
# endif
#endif

/*==========================================================================*/
/* Boolean data type                                                        */
/*==========================================================================*/

/** The ICU boolean type @stable ICU 2.0 */
typedef int8_t UBool;

#ifndef TRUE
/** The TRUE value of a UBool @stable ICU 2.0 */
#   define TRUE  1
#endif
#ifndef FALSE
/** The FALSE value of a UBool @stable ICU 2.0 */
#   define FALSE 0
#endif

/*==========================================================================*/
/* Unicode data types                                                       */
/*==========================================================================*/

/* wchar_t-related definitions -------------------------------------------- */

/*
 * \def U_WCHAR_IS_UTF16
 * Defined if wchar_t uses UTF-16.
 *
 * @stable ICU 2.0
 */
/*
 * \def U_WCHAR_IS_UTF32
 * Defined if wchar_t uses UTF-32.
 *
 * @stable ICU 2.0
 */
#if !defined(U_WCHAR_IS_UTF16) && !defined(U_WCHAR_IS_UTF32)
#   ifdef __STDC_ISO_10646__
#       if (U_SIZEOF_WCHAR_T==2)
#           define U_WCHAR_IS_UTF16
#       elif (U_SIZEOF_WCHAR_T==4)
#           define  U_WCHAR_IS_UTF32
#       endif
#   elif defined __UCS2__
#       if (U_PF_OS390 <= U_PLATFORM && U_PLATFORM <= U_PF_OS400) && (U_SIZEOF_WCHAR_T==2)
#           define U_WCHAR_IS_UTF16
#       endif
#   elif defined(__UCS4__) || (U_PLATFORM == U_PF_OS400 && defined(__UTF32__))
#       if (U_SIZEOF_WCHAR_T==4)
#           define U_WCHAR_IS_UTF32
#       endif
#   elif U_PLATFORM_IS_DARWIN_BASED || (U_SIZEOF_WCHAR_T==4 && U_PLATFORM_IS_LINUX_BASED)
#       define U_WCHAR_IS_UTF32
#   elif U_PLATFORM_HAS_WIN32_API
#       define U_WCHAR_IS_UTF16
#   endif
#endif

/* UChar and UChar32 definitions -------------------------------------------- */

/** Number of bytes in a UChar. @stable ICU 2.0 */
#define U_SIZEOF_UCHAR 2

/**
 * \def U_CHAR16_IS_TYPEDEF
 * If 1, then char16_t is a typedef and not a real type (yet)
 * @internal
 */
#if (U_PLATFORM == U_PF_AIX) && defined(__cplusplus) &&(U_CPLUSPLUS_VERSION < 11)
// for AIX, uchar.h needs to be included
# include <uchar.h>
# define U_CHAR16_IS_TYPEDEF 1
#elif defined(_MSC_VER) && (_MSC_VER < 1900)
// Versions of Visual Studio/MSVC below 2015 do not support char16_t as a real type,
// and instead use a typedef.  https://msdn.microsoft.com/library/bb531344.aspx
# define U_CHAR16_IS_TYPEDEF 1
#else
# define U_CHAR16_IS_TYPEDEF 0
#endif

/**
 * \var UChar
 *
 * The base type for UTF-16 code units and pointers.
 * Unsigned 16-bit integer.
 * Starting with ICU 59, C++ API uses char16_t directly, while C API continues to use UChar.
 *
 * UChar is configurable by defining the macro UCHAR_TYPE
 * on the preprocessor or compiler command line:
 * -DUCHAR_TYPE=uint16_t or -DUCHAR_TYPE=wchar_t (if U_SIZEOF_WCHAR_T==2) etc.
 * (The UCHAR_TYPE can also be \#defined earlier in this file, for outside the ICU library code.)
 * This is for transitional use from application code that uses uint16_t or wchar_t for UTF-16.
 *
 * The default is UChar=char16_t.
 *
 * C++11 defines char16_t as bit-compatible with uint16_t, but as a distinct type.
 *
 * In C, char16_t is a simple typedef of uint_least16_t.
 * ICU requires uint_least16_t=uint16_t for data memory mapping.
 * On macOS, char16_t is not available because the uchar.h standard header is missing.
 *
 * @stable ICU 4.4
 */

#if 1
    // #if 1 is normal. UChar defaults to char16_t in C++.
    // For configuration testing of UChar=uint16_t temporarily change this to #if 0.
    // The intltest Makefile #defines UCHAR_TYPE=char16_t,
    // so we only #define it to uint16_t if it is undefined so far.
#elif !defined(UCHAR_TYPE)
#   define UCHAR_TYPE uint16_t
#endif

#if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || \
        defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
    // Inside the ICU library code, never configurable.
    typedef char16_t UChar;
#elif defined(UCHAR_TYPE)
    typedef UCHAR_TYPE UChar;
#elif defined(__cplusplus)
    typedef char16_t UChar;
#else
    typedef uint16_t UChar;
#endif

/**
 * \var OldUChar
 * Default ICU 58 definition of UChar.
 * A base type for UTF-16 code units and pointers.
 * Unsigned 16-bit integer.
 *
 * Define OldUChar to be wchar_t if that is 16 bits wide.
 * If wchar_t is not 16 bits wide, then define UChar to be uint16_t.
 *
 * This makes the definition of OldUChar platform-dependent
 * but allows direct string type compatibility with platforms with
 * 16-bit wchar_t types.
 *
 * This is how UChar was defined in ICU 58, for transition convenience.
 * Exception: ICU 58 UChar was defined to UCHAR_TYPE if that macro was defined.
 * The current UChar responds to UCHAR_TYPE but OldUChar does not.
 *
 * @stable ICU 59
 */
#if U_SIZEOF_WCHAR_T==2
    typedef wchar_t OldUChar;
#elif defined(__CHAR16_TYPE__)
    typedef __CHAR16_TYPE__ OldUChar;
#else
    typedef uint16_t OldUChar;
#endif

/**
 * Define UChar32 as a type for single Unicode code points.
 * UChar32 is a signed 32-bit integer (same as int32_t).
 *
 * The Unicode code point range is 0..0x10ffff.
 * All other values (negative or >=0x110000) are illegal as Unicode code points.
 * They may be used as sentinel values to indicate "done", "error"
 * or similar non-code point conditions.
 *
 * Before ICU 2.4 (Jitterbug 2146), UChar32 was defined
 * to be wchar_t if that is 32 bits wide (wchar_t may be signed or unsigned)
 * or else to be uint32_t.
 * That is, the definition of UChar32 was platform-dependent.
 *
 * @see U_SENTINEL
 * @stable ICU 2.4
 */
typedef int32_t UChar32;

/**
 * This value is intended for sentinel values for APIs that
 * (take or) return single code points (UChar32).
 * It is outside of the Unicode code point range 0..0x10ffff.
 * 
 * For example, a "done" or "error" value in a new API
 * could be indicated with U_SENTINEL.
 *
 * ICU APIs designed before ICU 2.4 usually define service-specific "done"
 * values, mostly 0xffff.
 * Those may need to be distinguished from
 * actual U+ffff text contents by calling functions like
 * CharacterIterator::hasNext() or UnicodeString::length().
 *
 * @return -1
 * @see UChar32
 * @stable ICU 2.4
 */
#define U_SENTINEL (-1)

#include "unicode/urename.h"

#endif

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