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uformattable.h
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************** * Copyright (C) 2013-2014, International Business Machines Corporation and others. * All Rights Reserved. ******************************************************************************** * * File UFORMATTABLE.H * * Modification History: * * Date Name Description * 2013 Jun 7 srl New ******************************************************************************** */ /** * \file * \brief C API: UFormattable is a thin wrapper for primitive types used for formatting and parsing. * * This is a C interface to the icu::Formattable class. Static functions on this class convert * to and from this interface (via reinterpret_cast). Note that Formattables (and thus UFormattables) * are mutable, and many operations (even getters) may actually modify the internal state. For this * reason, UFormattables are not thread safe, and should not be shared between threads. * * See {@link unum_parseToUFormattable} for example code. */ #ifndef UFORMATTABLE_H #define UFORMATTABLE_H #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING #include "unicode/localpointer.h" /** * Enum designating the type of a UFormattable instance. * Practically, this indicates which of the getters would return without conversion * or error. * @see icu::Formattable::Type * @stable ICU 52 */ typedef enum UFormattableType { UFMT_DATE = 0, /**< ufmt_getDate() will return without conversion. @see ufmt_getDate*/ UFMT_DOUBLE, /**< ufmt_getDouble() will return without conversion. @see ufmt_getDouble*/ UFMT_LONG, /**< ufmt_getLong() will return without conversion. @see ufmt_getLong */ UFMT_STRING, /**< ufmt_getUChars() will return without conversion. @see ufmt_getUChars*/ UFMT_ARRAY, /**< ufmt_countArray() and ufmt_getArray() will return the value. @see ufmt_getArrayItemByIndex */ UFMT_INT64, /**< ufmt_getInt64() will return without conversion. @see ufmt_getInt64 */ UFMT_OBJECT, /**< ufmt_getObject() will return without conversion. @see ufmt_getObject*/ #ifndef U_HIDE_DEPRECATED_API /** * One more than the highest normal UFormattableType value. * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420. */ UFMT_COUNT #endif /* U_HIDE_DEPRECATED_API */ } UFormattableType; /** * Opaque type representing various types of data which may be used for formatting * and parsing operations. * @see icu::Formattable * @stable ICU 52 */ typedef void *UFormattable; /** * Initialize a UFormattable, to type UNUM_LONG, value 0 * may return error if memory allocation failed. * parameter status error code. * See {@link unum_parseToUFormattable} for example code. * @stable ICU 52 * @return the new UFormattable * @see ufmt_close * @see icu::Formattable::Formattable() */ U_STABLE UFormattable* U_EXPORT2 ufmt_open(UErrorCode* status); /** * Cleanup any additional memory allocated by this UFormattable. * @param fmt the formatter * @stable ICU 52 * @see ufmt_open */ U_STABLE void U_EXPORT2 ufmt_close(UFormattable* fmt); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUFormattablePointer * "Smart pointer" class, closes a UFormattable via ufmt_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 52 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUFormattablePointer, UFormattable, ufmt_close); U_NAMESPACE_END #endif /** * Return the type of this object * @param fmt the UFormattable object * @param status status code - U_ILLEGAL_ARGUMENT_ERROR is returned if the UFormattable contains data not supported by * the API * @return the value as a UFormattableType * @see ufmt_isNumeric * @see icu::Formattable::getType() const * @stable ICU 52 */ U_STABLE UFormattableType U_EXPORT2 ufmt_getType(const UFormattable* fmt, UErrorCode *status); /** * Return whether the object is numeric. * @param fmt the UFormattable object * @return true if the object is a double, long, or int64 value, else false. * @see ufmt_getType * @see icu::Formattable::isNumeric() const * @stable ICU 52 */ U_STABLE UBool U_EXPORT2 ufmt_isNumeric(const UFormattable* fmt); /** * Gets the UDate value of this object. If the type is not of type UFMT_DATE, * status is set to U_INVALID_FORMAT_ERROR and the return value is * undefined. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @return the value * @stable ICU 52 * @see icu::Formattable::getDate(UErrorCode&) const */ U_STABLE UDate U_EXPORT2 ufmt_getDate(const UFormattable* fmt, UErrorCode *status); /** * Gets the double value of this object. If the type is not a UFMT_DOUBLE, or * if there are additional significant digits than fit in a double type, * a conversion is performed with possible loss of precision. * If the type is UFMT_OBJECT and the * object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @return the value * @stable ICU 52 * @see icu::Formattable::getDouble(UErrorCode&) const */ U_STABLE double U_EXPORT2 ufmt_getDouble(UFormattable* fmt, UErrorCode *status); /** * Gets the long (int32_t) value of this object. If the magnitude is too * large to fit in a long, then the maximum or minimum long value, * as appropriate, is returned and the status is set to * U_INVALID_FORMAT_ERROR. If this object is of type UFMT_INT64 and * it fits within a long, then no precision is lost. If it is of * type kDouble or kDecimalNumber, then a conversion is peformed, with * truncation of any fractional part. If the type is UFMT_OBJECT and * the object is a Measure, then the result of * getNumber().getLong(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @return the value * @stable ICU 52 * @see icu::Formattable::getLong(UErrorCode&) const */ U_STABLE int32_t U_EXPORT2 ufmt_getLong(UFormattable* fmt, UErrorCode *status); /** * Gets the int64_t value of this object. If this object is of a numeric * type and the magnitude is too large to fit in an int64, then * the maximum or minimum int64 value, as appropriate, is returned * and the status is set to U_INVALID_FORMAT_ERROR. If the * magnitude fits in an int64, then a casting conversion is * peformed, with truncation of any fractional part. If the type * is UFMT_OBJECT and the object is a Measure, then the result of * getNumber().getDouble(status) is returned. If this object is * neither a numeric type nor a Measure, then 0 is returned and * the status is set to U_INVALID_FORMAT_ERROR. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @return the value * @stable ICU 52 * @see icu::Formattable::getInt64(UErrorCode&) const */ U_STABLE int64_t U_EXPORT2 ufmt_getInt64(UFormattable* fmt, UErrorCode *status); /** * Returns a pointer to the UObject contained within this * formattable (as a const void*), or NULL if this object * is not of type UFMT_OBJECT. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @return the value as a const void*. It is a polymorphic C++ object. * @stable ICU 52 * @see icu::Formattable::getObject() const */ U_STABLE const void *U_EXPORT2 ufmt_getObject(const UFormattable* fmt, UErrorCode *status); /** * Gets the string value of this object as a UChar string. If the type is not a * string, status is set to U_INVALID_FORMAT_ERROR and a NULL pointer is returned. * This function is not thread safe and may modify the UFormattable if need be to terminate the string. * The returned pointer is not valid if any other functions are called on this UFormattable, or if the UFormattable is closed. * @param fmt the UFormattable object * @param status the error code - any conversion or format errors * @param len if non null, contains the string length on return * @return the null terminated string value - must not be referenced after any other functions are called on this UFormattable. * @stable ICU 52 * @see icu::Formattable::getString(UnicodeString&)const */ U_STABLE const UChar* U_EXPORT2 ufmt_getUChars(UFormattable* fmt, int32_t *len, UErrorCode *status); /** * Get the number of array objects contained, if an array type UFMT_ARRAY * @param fmt the UFormattable object * @param status the error code - any conversion or format errors. U_ILLEGAL_ARGUMENT_ERROR if not an array type. * @return the number of array objects or undefined if not an array type * @stable ICU 52 * @see ufmt_getArrayItemByIndex */ U_STABLE int32_t U_EXPORT2 ufmt_getArrayLength(const UFormattable* fmt, UErrorCode *status); /** * Get the specified value from the array of UFormattables. Invalid if the object is not an array type UFMT_ARRAY * @param fmt the UFormattable object * @param n the number of the array to return (0 based). * @param status the error code - any conversion or format errors. Returns an error if n is out of bounds. * @return the nth array value, only valid while the containing UFormattable is valid. NULL if not an array. * @stable ICU 52 * @see icu::Formattable::getArray(int32_t&, UErrorCode&) const */ U_STABLE UFormattable * U_EXPORT2 ufmt_getArrayItemByIndex(UFormattable* fmt, int32_t n, UErrorCode *status); /** * Returns a numeric string representation of the number contained within this * formattable, or NULL if this object does not contain numeric type. * For values obtained by parsing, the returned decimal number retains * the full precision and range of the original input, unconstrained by * the limits of a double floating point or a 64 bit int. * * This function is not thread safe, and therfore is not declared const, * even though it is logically const. * The resulting buffer is owned by the UFormattable and is invalid if any other functions are * called on the UFormattable. * * Possible errors include U_MEMORY_ALLOCATION_ERROR, and * U_INVALID_STATE if the formattable object has not been set to * a numeric type. * @param fmt the UFormattable object * @param len if non-null, on exit contains the string length (not including the terminating null) * @param status the error code * @return the character buffer as a NULL terminated string, which is owned by the object and must not be accessed if any other functions are called on this object. * @stable ICU 52 * @see icu::Formattable::getDecimalNumber(UErrorCode&) */ U_STABLE const char * U_EXPORT2 ufmt_getDecNumChars(UFormattable *fmt, int32_t *len, UErrorCode *status); #endif #endif
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