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-<?xml version="1.0" encoding="utf-8" ?>
-<!DOCTYPE erlref SYSTEM "erlref.dtd">
-
-<erlref>
- <header>
- <copyright>
- <year>2002</year><year>2017</year>
- <holder>Ericsson AB, All Rights Reserved</holder>
- </copyright>
- <legalnotice>
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
- The Initial Developer of the Original Code is Ericsson AB.
- </legalnotice>
-
- <title>fixed</title>
- <prepared></prepared>
- <responsible></responsible>
- <docno></docno>
- <approved></approved>
- <checked></checked>
- <date>2002-05-22</date>
- <rev>A</rev>
- </header>
- <module>fixed</module>
- <modulesummary>the corba fixed type</modulesummary>
- <description>
- <p>This module contains functions that gives an interface to the CORBA fixed type.</p>
- <p>The type <c>Fixed</c> used below is defined as:</p>
- <code type="erl">
--record(fixed, {digits, scale, value}).
- </code>
- <p>where <c>digits</c> is the total amount of digits it consists of and
- <c>scale</c> is the number of fractional digits. The <c>value</c> field
- contains the actual Fixed value represented as an integer. The limitations
- of each field are:</p>
- <list type="bulleted">
- <item>Digits - integer(), -1 > Digits &lt; 32</item>
- <item>Scale - integer(), -1 > Scale =&lt; Digits</item>
- <item>Value - integer(), range (31 digits): &plusmn;9999999999999999999999999999999</item>
- </list>
- <p>Since the Value part is represented by an integer, it is vital that the
- Digits and Scale values are correct. This also means that trailing zeros
- cannot be left out in some cases:</p>
- <list type="bulleted">
- <item>fixed&lt;5,3> eq. 03.140d eq. 3140</item>
- <item>fixed&lt;3,2> eq. 3.14d eq. 314</item>
- </list>
- <p>Leading zeros can be left out.</p>
- <p>For your convenience, this module exports functions which handle
- unary (<c>-</c>) and binary (<c>+-*/</c>) operations legal for the Fixed type.
- Since a unary <c>+</c> have no effect, this module do not export such a
- function. Any of the binary operations may cause an overflow (i.e. more than
- 31 significant digits; leading and trailing zeros are not considered
- significant). If this is the case, the Digit and Scale values are adjusted
- and the Value truncated (no rounding performed). This behavior is
- compliant with the OMG CORBA specification. Each binary operation have
- the following upper bounds:</p>
- <list type="bulleted">
- <item><em>Fixed1 + Fixed2</em> - <c><![CDATA[fixed<max(d1-s1,d2-s2) + max(s1,s2) + 1, max(s1,s2)>]]></c></item>
- <item><em>Fixed1 - Fixed2</em> - <c><![CDATA[fixed<max(d1-s1,d2-s2) + max(s1,s2) + 1, max(s1,s2)>]]></c></item>
- <item><em>Fixed1 * Fixed2</em> - <c><![CDATA[fixed<d1+d2, s1+s2>]]></c></item>
- <item><em>Fixed1 / Fixed2</em> - <c><![CDATA[fixed<(d1-s1+s2) + Sinf ,Sinf >]]></c></item>
- </list>
- <p>A quotient may have an arbitrary number of decimal places, which is
- denoted by a scale of Sinf.</p>
- </description>
- <funcs>
- <func>
- <name>create(Digits, Scale, Value) -> Result</name>
- <fsummary>Create a fixed type</fsummary>
- <type>
- <v>Result = Fixed Type | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>This function creates a new instance of a <c>Fixed Type</c>. If
- the limitations is not fulfilled (e.g. overflow) an exception is
- raised.</p>
- </desc>
- </func>
- <func>
- <name>get_typecode(Fixed) -> Result</name>
- <fsummary>Create TypeCode representing the supplied fixed type</fsummary>
- <type>
- <v>Result = TypeCode | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Returns the TypeCode which represents the supplied Fixed type.
- If the parameter is not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- <func>
- <name>add(Fixed1, Fixed2) -> Result</name>
- <fsummary>Add the supplied Fixed types</fsummary>
- <type>
- <v>Result = Fixed1 + Fixed2 | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Performs a Fixed type addition.
- If the parameters are not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- <func>
- <name>subtract(Fixed1, Fixed2) -> Result</name>
- <fsummary>Subtract Fixed2 from Fixed1</fsummary>
- <type>
- <v>Result = Fixed1 - Fixed2 | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Performs a Fixed type subtraction.
- If the parameters are not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- <func>
- <name>multiply(Fixed1, Fixed2) -> Result</name>
- <fsummary>Multiply Fixed1 with Fixed2</fsummary>
- <type>
- <v>Result = Fixed1 * Fixed2 | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Performs a Fixed type multiplication.
- If the parameters are not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- <func>
- <name>divide(Fixed1, Fixed2) -> Result</name>
- <fsummary>Divide Fixed1 with Fixed2</fsummary>
- <type>
- <v>Result = Fixed1 / Fixed2 | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Performs a Fixed type division.
- If the parameters are not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- <func>
- <name>unary_minus(Fixed) -> Result</name>
- <fsummary>Negate the supplied Fixed Type</fsummary>
- <type>
- <v>Result = -Fixed | {'EXCEPTION', #'BAD_PARAM'{}}</v>
- </type>
- <desc>
- <p>Negates the supplied Fixed type.
- If the parameter is not of the correct type, an exception is raised.</p>
- </desc>
- </func>
- </funcs>
-
-</erlref>
-