chromium/third_party/icu/source/i18n/unicode/numberrangeformatter.h

// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html

#ifndef __NUMBERRANGEFORMATTER_H__
#define __NUMBERRANGEFORMATTER_H__

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#if !UCONFIG_NO_FORMATTING

#include <atomic>
#include "unicode/appendable.h"
#include "unicode/fieldpos.h"
#include "unicode/formattedvalue.h"
#include "unicode/fpositer.h"
#include "unicode/numberformatter.h"
#include "unicode/unumberrangeformatter.h"

/**
 * \file
 * \brief C++ API: Library for localized formatting of number, currency, and unit ranges.
 *
 * The main entrypoint to the formatting of ranges of numbers, including currencies and other units of measurement.
 * <p>
 * Usage example:
 * <p>
 * <pre>
 * NumberRangeFormatter::with()
 *     .identityFallback(UNUM_IDENTITY_FALLBACK_APPROXIMATELY_OR_SINGLE_VALUE)
 *     .numberFormatterFirst(NumberFormatter::with().adoptUnit(MeasureUnit::createMeter()))
 *     .numberFormatterSecond(NumberFormatter::with().adoptUnit(MeasureUnit::createKilometer()))
 *     .locale("en-GB")
 *     .formatFormattableRange(750, 1.2, status)
 *     .toString(status);
 * // => "750 m - 1.2 km"
 * </pre>
 * <p>
 * Like NumberFormatter, NumberRangeFormatter instances (i.e., LocalizedNumberRangeFormatter
 * and UnlocalizedNumberRangeFormatter) are immutable and thread-safe. This API is based on the
 * <em>fluent</em> design pattern popularized by libraries such as Google's Guava.
 *
 * @author Shane Carr
 */


U_NAMESPACE_BEGIN

// Forward declarations:
class PluralRules;

namespace number {  // icu::number

// Forward declarations:
class UnlocalizedNumberRangeFormatter;
class LocalizedNumberRangeFormatter;
class FormattedNumberRange;

namespace impl {

// Forward declarations:
struct RangeMacroProps;
class DecimalQuantity;
class UFormattedNumberRangeData;
class NumberRangeFormatterImpl;
struct UFormattedNumberRangeImpl;

} // namespace impl


#if 0

/**
 * \cond
 * Export an explicit template instantiation. See datefmt.h
 * (When building DLLs for Windows this is required.)
 */
#if U_PLATFORM == U_PF_WINDOWS && !defined(U_IN_DOXYGEN) && !defined(U_STATIC_IMPLEMENTATION)
} // namespace icu::number
U_NAMESPACE_END

template struct U_I18N_API std::atomic< U_NAMESPACE_QUALIFIER number::impl::NumberRangeFormatterImpl*>;

U_NAMESPACE_BEGIN
namespace number {  // icu::number
#endif
/** \endcond */

#endif

// Other helper classes would go here, but there are none.

namespace impl {  // icu::number::impl

// Do not enclose entire MacroProps with #ifndef U_HIDE_INTERNAL_API, needed for a protected field
/** @internal */
struct U_I18N_API RangeMacroProps : public UMemory { … };

} // namespace impl

/**
 * An abstract base class for specifying settings related to number formatting. This class is implemented by
 * {@link UnlocalizedNumberRangeFormatter} and {@link LocalizedNumberRangeFormatter}. This class is not intended for
 * public subclassing.
 */
template<typename Derived>
class U_I18N_API NumberRangeFormatterSettings { … };

// Explicit instantiations in source/i18n/numrange_fluent.cpp.
// (MSVC treats imports/exports of explicit instantiations differently.)
#ifndef _MSC_VER
extern template class NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>;
extern template class NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>;
#endif

/**
 * A NumberRangeFormatter that does not yet have a locale. In order to format, a locale must be specified.
 *
 * Instances of this class are immutable and thread-safe.
 *
 * @see NumberRangeFormatter
 * @stable ICU 63
 */
class U_I18N_API UnlocalizedNumberRangeFormatter
        : public NumberRangeFormatterSettings<UnlocalizedNumberRangeFormatter>, public UMemory { … };

/**
 * A NumberRangeFormatter that has a locale associated with it; this means .formatRange() methods are available.
 *
 * Instances of this class are immutable and thread-safe.
 *
 * @see NumberFormatter
 * @stable ICU 63
 */
class U_I18N_API LocalizedNumberRangeFormatter
        : public NumberRangeFormatterSettings<LocalizedNumberRangeFormatter>, public UMemory { … };

/**
 * The result of a number range formatting operation. This class allows the result to be exported in several data types,
 * including a UnicodeString and a FieldPositionIterator.
 *
 * Instances of this class are immutable and thread-safe.
 *
 * @stable ICU 63
 */
class U_I18N_API FormattedNumberRange : public UMemory, public FormattedValue { … };

// inline impl of @stable ICU 68 method
template<typename StringClass>
std::pair<StringClass, StringClass> FormattedNumberRange::getDecimalNumbers(UErrorCode& status) const { … }

/**
 * See the main description in numberrangeformatter.h for documentation and examples.
 *
 * @stable ICU 63
 */
class U_I18N_API NumberRangeFormatter final { … };

}  // namespace number
U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif // __NUMBERRANGEFORMATTER_H__