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<?xml version="1.0"?>
<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 1.0.4//EN" "http://www.gnustep.org/gsdoc-1_0_4.dtd">
<gsdoc base="NSDecimalNumber" up="Base">
<head>
<title>NSDecimalNumber class reference</title>
<author name="Fred Kiefer">
<email address="FredKiefer@gmx.de">
FredKiefer@gmx.de
</email>
</author>
<copy>2000 Free Software Foundation, Inc.</copy>
</head>
<body>
<front><contents /></front>
<chapter>
<heading>
Software documentation for the NSDecimalNumber class
</heading>
<class name="NSDecimalNumber" super="NSNumber" ovadd="10.0.0">
<declared>Foundation/NSDecimalNumber.h</declared>
<conform>NSDecimalNumberBehaviors</conform>
<desc>
<p>
<strong>Class</strong> that implements a number of
methods for performing decimal arithmetic to
arbitrary precision. The behavior in terms of
rounding choices and exception handling may be
customized using the
<ref type="class" id="NSDecimalNumberHandler">NSDecimalNumberHandler</ref>class, and defaults to <ref type="method" id="+defaultDecimalNumberHandler" class="NSDecimalNumberHandler">[NSDecimalNumberHandler +defaultDecimalNumberHandler]</ref>.</p>
<p>
Equivalent functionality to the
<code>NSDecimalNumber</code> class may be accessed
through functions, mostly named
<code>NSDecimalXXX</code>, e.g.,
<ref type="function" id="NSDecimalMin">
NSDecimalMin()
</ref>
. Both the class and the functions use a structure
called <code>NSDecimal</code>.
</p>
<p>
Note that instances of <code>NSDecimalNumber</code>
are immutable.
</p>
</desc>
<ivariable type="NSDecimal" name="data" validity="protected" ovadd="10.0.0">
<desc>
<em>Description forthcoming.</em>
</desc>
</ivariable>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>decimalNumberWithDecimal:</sel>
<arg type="NSDecimal">decimal</arg>
<desc>
New instance with given value. Note an NSDecimal may be
created using the function
<ref type="function" id="NSDecimalFromString">
NSDecimalFromString()
</ref>
.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>decimalNumberWithMantissa:</sel>
<arg type="unsigned long long">mantissa</arg>
<sel>exponent:</sel>
<arg type="short">exponent</arg>
<sel>isNegative:</sel>
<arg type="BOOL">isNegative</arg>
<desc>
New instance by component. Note that the precision of
this initializer is limited.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>decimalNumberWithString:</sel>
<arg type="NSString*">numericString</arg>
<desc>
New instance from string. Arbitrary precision is
preserved, though calling one of the
<code>decimalNumberBy...</code> methods will return
a result constrained by the current
<em><code>scale</code></em>. Number format is parsed
according to current default locale.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>decimalNumberWithString:</sel>
<arg type="NSString*">numericString</arg>
<sel>locale:</sel>
<arg type="NSDictionary*">locale</arg>
<desc>
New instance from string. Arbitrary precision is
preserved, though calling one of the
<code>decimalNumberBy...</code> methods will return
a result constrained by the current
<em><code>scale</code></em>. Number format is parsed
according to given <var>locale</var>.
</desc>
</method>
<method type="id<NSDecimalNumberBehaviors>" factory="yes" ovadd="10.0.0">
<sel>defaultBehavior</sel>
<desc>
Returns the default rounding/precision/exception
handling behavior, which is same as
<ref type="method" id="+defaultDecimalNumberHandler" class="NSDecimalNumberHandler">[NSDecimalNumberHandler +defaultDecimalNumberHandler]</ref> unless it has been explicitly set otherwise.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>maximumDecimalNumber</sel>
<desc>
Return maximum positive value that can be
represented.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>minimumDecimalNumber</sel>
<desc>
Return minimum negative value (<em>not</em> the
smallest positive value) that can be represented.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>notANumber</sel>
<desc>
Return a fixed value representing an NaN.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>one</sel>
<desc>
Return a constant object with a value of one.
</desc>
</method>
<method type="void" factory="yes" ovadd="10.0.0">
<sel>setDefaultBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Sets the default rounding/precision/exception handling
<var>behavior</var> to the given <var>behavior</var>.
If this is not called, <var>behavior</var> defaults to
<ref type="method" id="+defaultDecimalNumberHandler" class="NSDecimalNumberHandler">[NSDecimalNumberHandler +defaultDecimalNumberHandler]</ref>.
</desc>
</method>
<method type="NSDecimalNumber*" factory="yes" ovadd="10.0.0">
<sel>zero</sel>
<desc>
Return a constant object with a value of zero.
</desc>
</method>
<method type="NSComparisonResult" ovadd="10.0.0">
<sel>compare:</sel>
<arg type="NSNumber*">decimalNumber</arg>
<desc>
Compares with other number, returning less,
greater, or equal.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByAdding:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<desc>
Adds self to <var>decimalNumber</var> and returns new
result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByAdding:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Adds self to <var>decimalNumber</var> and returns new
result, using given <var>behavior</var> for
rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByDividingBy:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<desc>
Divides self by <var>decimalNumber</var> and
returns new result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByDividingBy:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Divides self by <var>decimalNumber</var> and
returns new result, using given <var>behavior</var>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByMultiplyingBy:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<desc>
Multiplies self by <var>decimalNumber</var> and
returns new result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByMultiplyingBy:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Multiplies self by <var>decimalNumber</var> and
returns new result, using given <var>behavior</var>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByMultiplyingByPowerOf10:</sel>
<arg type="short">power</arg>
<desc>
Multiplies self by given <var>power</var> of 10
and returns new result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByMultiplyingByPowerOf10:</sel>
<arg type="short">power</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Multiplies self by given <var>power</var> of 10
and returns new result, using given <var>behavior</var>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByRaisingToPower:</sel>
<arg type="NSUInteger">power</arg>
<desc>
Raises self to given positive integer
<var>power</var> and returns new result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByRaisingToPower:</sel>
<arg type="NSUInteger">power</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Raises self to given positive integer
<var>power</var> and returns new result, using given
<var>behavior</var> for rounding/precision/error
handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberByRoundingAccordingToBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Returns rounded version of underlying decimal.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberBySubtracting:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<desc>
Subtracts <var>decimalNumber</var> from self and
returns new result, using
<ref type="method" id="+defaultBehavior">
+defaultBehavior
</ref>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>decimalNumberBySubtracting:</sel>
<arg type="NSDecimalNumber*">decimalNumber</arg>
<sel>withBehavior:</sel>
<arg type="id<NSDecimalNumberBehaviors>">behavior</arg>
<desc>
Subtracts <var>decimalNumber</var> from self and
returns new result, using given <var>behavior</var>
for rounding/precision/error handling.
</desc>
</method>
<method type="NSDecimal" ovadd="10.0.0">
<sel>decimalValue</sel>
<desc>
Return underlying value as an <code>NSDecimal</code>
structure.
</desc>
</method>
<method type="NSString*" ovadd="10.0.0">
<sel>descriptionWithLocale:</sel>
<arg type="id">locale</arg>
<desc>
Returns string version of number formatted
according to <var>locale</var>.
</desc>
</method>
<method type="double" ovadd="10.0.0">
<sel>doubleValue</sel>
<desc>
Returns underlying value as a
<code><strong>double</strong></code>, which may be
an approximation if precision greater than the default
of 38.
</desc>
</method>
<method type="id" ovadd="10.0.0">
<sel>initWithDecimal:</sel>
<arg type="NSDecimal">decimal</arg>
<desc>
Initialize with given value. Note an NSDecimal
may be created using the function
<ref type="function" id="NSDecimalFromString">
NSDecimalFromString()
</ref>
.
</desc>
</method>
<method type="id" ovadd="10.0.0">
<sel>initWithMantissa:</sel>
<arg type="unsigned long long">mantissa</arg>
<sel>exponent:</sel>
<arg type="short">exponent</arg>
<sel>isNegative:</sel>
<arg type="BOOL">flag</arg>
<desc>
Initialize by component. Note that the precision
of this initializer is limited.
</desc>
</method>
<method type="id" ovadd="10.0.0">
<sel>initWithString:</sel>
<arg type="NSString*">numberValue</arg>
<desc>
Initialize from string. Arbitrary precision is
preserved, though calling one of the
<code>decimalNumberBy...</code> methods will return
a result constrained by the current
<em><code>scale</code></em>. Number format is parsed
according to current default locale.
</desc>
</method>
<method type="id" ovadd="10.0.0">
<sel>initWithString:</sel>
<arg type="NSString*">numberValue</arg>
<sel>locale:</sel>
<arg type="NSDictionary*">locale</arg>
<desc>
Initialize from string. Arbitrary precision is
preserved, though calling one of the
<code>decimalNumberBy...</code> methods will return
a result constrained by the current
<em><code>scale</code></em>. Number format is parsed
according to given <var>locale</var>.
</desc>
</method>
<method type="const char*" ovadd="10.0.0">
<sel>objCType</sel>
<desc>
Returns the Objective-C type (
<code>@encode(...)</code> compatible) of the data
contained <code>NSDecimalNumber</code>, which is
by convention "d" (for <strong>double</strong>), even
though this is not strictly accurate.
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the NSDecimalNumberHandler
class
</heading>
<class name="NSDecimalNumberHandler" super="NSObject" ovadd="10.0.0">
<declared>Foundation/NSDecimalNumber.h</declared>
<conform>NSDecimalNumberBehaviors</conform>
<desc>
A utility class adopting
<ref type="protocol" id="(NSDecimalNumberBehaviors)"><NSDecimalNumberBehaviors></ref>
protocol. Can be used to control
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
rounding and exception-handling behavior, by
passing an instance as an argument to any
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
method ending with <code>...Behavior:</code>.
</desc>
<ivariable type="BOOL" name="_raiseOnDivideByZero" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="BOOL" name="_raiseOnExactness" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="BOOL" name="_raiseOnOverflow" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="BOOL" name="_raiseOnUnderflow" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="NSRoundingMode" name="_roundingMode" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<ivariable type="short int" name="_scale" validity="protected" ovadd="10.0.0">
<desc>
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</desc>
</ivariable>
<method type="id" factory="yes" ovadd="10.0.0">
<sel>decimalNumberHandlerWithRoundingMode:</sel>
<arg type="NSRoundingMode">roundingMode</arg>
<sel>scale:</sel>
<arg type="short">scale</arg>
<sel>raiseOnExactness:</sel>
<arg type="BOOL">raiseOnExactness</arg>
<sel>raiseOnOverflow:</sel>
<arg type="BOOL">raiseOnOverflow</arg>
<sel>raiseOnUnderflow:</sel>
<arg type="BOOL">raiseOnUnderflow</arg>
<sel>raiseOnDivideByZero:</sel>
<arg type="BOOL">raiseOnDivideByZero</arg>
<desc>
Constructor setting all behavior. (For more
precise control over error handling, create your
own class implementing the
<ref type="protocol" id="(NSDecimalNumberBehaviors)"><NSDecimalNumberBehaviors></ref>
protocol.)
</desc>
</method>
<method type="id" factory="yes" ovadd="10.0.0">
<sel>defaultDecimalNumberHandler</sel>
<desc>
Provides an instance implementing the default
behavior for the
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
class. 38 decimal digits, rounded to closest
return value (<code>NSRoundPlain</code>).
Exceptions raised on overflow, underflow, and
divide by zero.
</desc>
</method>
<method type="id" ovadd="10.0.0">
<sel>initWithRoundingMode:</sel>
<arg type="NSRoundingMode">roundingMode</arg>
<sel>scale:</sel>
<arg type="short">scale</arg>
<sel>raiseOnExactness:</sel>
<arg type="BOOL">raiseOnExactness</arg>
<sel>raiseOnOverflow:</sel>
<arg type="BOOL">raiseOnOverflow</arg>
<sel>raiseOnUnderflow:</sel>
<arg type="BOOL">raiseOnUnderflow</arg>
<sel>raiseOnDivideByZero:</sel>
<arg type="BOOL">raiseOnDivideByZero</arg>
<desc>
Initializer setting all behavior. (For more
precise control over error handling, create your
own class implementing the
<ref type="protocol" id="(NSDecimalNumberBehaviors)"><NSDecimalNumberBehaviors></ref>
protocol.)
</desc>
</method>
</class>
</chapter>
<chapter>
<heading>
Software documentation for the
NSNumber(NSDecimalNumber) category
</heading>
<category name="NSDecimalNumber" class="NSNumber" ovadd="10.0.0">
<declared>Foundation/NSDecimalNumber.h</declared>
<desc>
Interface for obtaining an NSDecimalNumber value
from an ordinary NSNumber.
</desc>
<method type="NSDecimal" ovadd="10.0.0">
<sel>decimalValue</sel>
<desc>
Obtaining an NSDecimalNumber version of an
ordinary NSNumber. <br /> Returns an NSDecimal
representation of the number. Float and
<strong>double</strong> values may not be
converted exactly
</desc>
</method>
</category>
</chapter>
<chapter>
<heading>
Software documentation for the
NSDecimalNumberBehaviors protocol
</heading>
<protocol name="NSDecimalNumberBehaviors" ovadd="10.0.0">
<declared>Foundation/NSDecimalNumber.h</declared>
<desc>
This protocol encapsulates information about how an
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
should round and process exceptions. Usually you can
just create objects of the
<ref type="class" id="NSDecimalNumberHandler">NSDecimalNumberHandler</ref>
class, which implements this protocol, but if you
don't want to use that class you can create your
own implementing it.
</desc>
<method type="NSDecimalNumber*" ovadd="10.0.0">
<sel>exceptionDuringOperation:</sel>
<arg type="SEL">method</arg>
<sel>error:</sel>
<arg type="NSCalculationError">error</arg>
<sel>leftOperand:</sel>
<arg type="NSDecimalNumber*">leftOperand</arg>
<sel>rightOperand:</sel>
<arg type="NSDecimalNumber*">rightOperand</arg>
<desc>
<p>
Specifies behavior when, in the course of
applying <var>method</var> to
<var>leftOperand</var> and <var>rightOperand</var>,
an
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>instance encounters given <var>error</var>.</p>
<p>
<var>error</var> has four possible constant
values:
</p>
<deflist>
<term>
<code>NSCalculationLossOfPrecision</code>
</term>
<desc>
The number can't be represented in 38 significant
digits.
</desc>
<term><code>NSCalculationOverflow</code></term>
<desc>
The number is too large to represent.
</desc>
<term><code>NSCalculationUnderflow</code></term>
<desc>
The number is too small to represent.
</desc>
<term>
<code>NSCalculationDivideByZero</code>
</term>
<desc>The caller tried to divide by 0.</desc>
</deflist>
<p>
Behavior on <var>error</var> can be one of the
following:
</p>
<list>
<item>Raise an exception.</item>
<item>
Return <code>nil</code>. The calling
<var>method</var> will return its value as
though no <var>error</var> had occurred. If
<var>error</var> is
<code>NSCalculationLossOfPrecision</code>,
<var>method</var> will return an imprecise
value, constrained to 38 significant digits.
If <var>error</var> is
<code>NSCalculationUnderflow</code> or
<code>NSCalculationOverflow</code>,
<var>method</var> will return
<code>NSDecimalNumber</code> 's
<code>notANumber</code>. You shouldn't return
<code>nil</code> if <var>error</var> is
<code>NSDivideByZero</code>.
</item>
<item>
Correct the <var>error</var> and return a
valid <code>NSDecimalNumber</code>. The calling
<var>method</var> will use this as its own
return value.
</item>
</list>
</desc>
</method>
<method type="NSRoundingMode" ovadd="10.0.0">
<sel>roundingMode</sel>
<desc>
Specifies how
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
's <code>decimalNumberBy...</code> methods round their
return values. This should be set to one of the
following constants:
<deflist>
<term><code>NSRoundDown</code></term>
<desc>Always round down.</desc>
<term><code>NSRoundUp</code></term>
<desc>Always round up.</desc>
<term><code>NSRoundPlain</code></term>
<desc>
Round to the closest possible return value.
Halfway (e.g..5) rounds up for positive
numbers, down for negative (towards larger
absolute value).
</desc>
<term><code>NSRoundBankers</code></term>
<desc>
Round to the closest possible return value, but
halfway (e.g..5) rounds towards possibility
whose last digit is even.
</desc>
</deflist>
</desc>
</method>
<method type="short" ovadd="10.0.0">
<sel>scale</sel>
<desc>
Specifies the precision of the values returned by
<ref type="class" id="NSDecimalNumber">NSDecimalNumber</ref>
's <code>decimalNumberBy...</code> methods, in terms
of the number of digits allowed after the decimal
point. This can be negative, implying that the
precision should be, e.g., 100's, 1000's, etc..
For unlimited precision, set to
<code>NSDecimalNoScale</code>.
</desc>
</method>
</protocol>
</chapter>
</body>
</gsdoc>
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