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qdecimal/doc/Announce.txt
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Dear Qt users,
I would like to announce initial public release of QDecimal library.
Most computers today support binary floating-point in hardware. While suitable
for many purposes, binary floating-point arithmetic should not be used
for financial, commercial, and user-centric applications because the
decimal data used in these applications cannot be represented exactly
using binary floating-point.
The General Decimal Arithmetic (GDA) specification aims to address
deficiencies in the binary floating-point arithmetic, and defines a
decimal arithmetic which meets the requirements of commercial,
financial, and human-oriented applications. It also matches the
decimal arithmetic in the IEEE 754-2008 Standard for Floating Point
Arithmetic.
The decNumber library is full implementation of the GDA specification
and also matches the decimal arithmetic in the IEEE 754-2008 Standard
for Floating Point Arithmetic.
The QDecimal is a thin layer around IBM's decNumber library which
implements the General Decimal Arithmetic Specification in ANSI C. [1]
The QDecimal/decNumberlibrary [2,3] fully implements the specification,
and hence supports integer, fixed-point, and floating-point decimal
numbers directly, including infinite, NaN (Not a Number), and
subnormal values. Both arbitrary-precision and fixed-size
representations are supported.
The aim of the QDecimal library [4] is to extend decNumber functionality
to C++ language and Qt framework by using idioms, tecniques and best
practices in both tecnologies. For instance, inline functions are used
heavily to aid optimization, operator overloading and conversion
operators are defined to aid type casting in between the types defined
by QDecimal. Further these types are integrated with Qt object model
by introducing them to Qt meta type system.
CONTENTS
Following classes are defined by QDecimal library:
QDecNumber (based on decNumber):
----------
decNumber module uses an arbitrary-precision decimal number
representation designed for efficient computation in software and
implements the arithmetic and logical operations, together with a
number of conversions and utilities. Once a number is held as a
decNumber, no further conversions are necessary to carry out
arithmetic.
The decNumber representation is variable-length and machine-dependent
(for example, it contains integers which may be big-endian or
little-endian).
QDecNumber encapsulates decNumber and reimplements global functions
that operates upon decNumber as member functions with the same name.
QDecContext (based on decContext):
-----------
Most functions in the decNumber module take as an argument a
decContext structure, which provides the context for operations
(precision, rounding mode, etc.) and also controls the handling of
exceptional conditions (corresponding to the flags and trap enablers
in a hardware floating-point implementation).
QDecContext encapsulates decContext and provides decNumber library
functions that operates upon decContext as member functions.
QDecSingle (based on decSingle/decimal32):
----------
decimal32 is a 32-bit decimal floating-point representation which
provides 7 decimal digits of precision in a compressed format.
decSingle module provides the functions for the decimal32 format; this
format is intended for storage and interchange only and so the module
provides utilities and conversions but no arithmetic functions.
QDecSingle encapsulates decSingle and provides decNumber library
functions that operates upon decSingle as member functions with the
same name.
QDecDouble (based on decDouble/decimal64):
----------
decimal64 is a 64-bit decimal floating-point representation which
provides 16 decimal digits of precision in a compressed format.
decDouble module provides the functions for the decimal64 format; this
format is an IEEE 754 basic format and so a full set of arithmetic and
other functions is included.
QDecDouble encapsulates decDouble and provides decNumber library
functions that operates upon decSingle as member functions with the
same name.
QDecQuad (based on decQuad/decimal128):
--------
decimal128 is a 128-bit decimal floating-point representation which
provides 34 decimal digits of precision in a compressed format.
decQuad module provides the functions for the decimal128 format; this
format is an IEEE 754 basic format; it contains the same set of
functions as decDouble.
QDecQuad encapsulates decQuad and provides decNumber library functions
that operates upon decSingle as member functions with the same name.
QDecPacked (based on decPacked):
---------
The decPacked format is the classic packed decimal format implemented
by IBM S/360 and later machines, where each digit is encoded as a
4-bit binary sequence (BCD) and a number is ended by a 4-bit sign
indicator. The decPacked module accepts variable lengths, allowing for
very large numbers (up to a billion digits), and also allows the
specification of a scale.
QDecPacked augments decPacked by encapsulating reference counted byte
array and scale of the decimal point as member variables, thus, freeing up
user of this class from memory management and keeping track of scale value.
LICENSE
QDecimal is under the terms of the LGPL v2.1.
decNumber is under the terms of ICU v1.8.1
See COPYRIGHT file within the package for terms of the these licenses.
Both licences allow commercial and non-commercial use of the software.
PLATFORMS
QDecimal should be usable in all platforms on which Qt 4.7.x or
greater is supported:
We regularly test on following platforms:
Solaris 11 x86 (sstudio 12.2 CC 5.11)
Linux x64 2.6.38 (Ubuntu 11.04 - gcc 4.5.2)
Linux x86 2.6.38 (Ubuntu 11.04- gcc 4.5.2)
Windows XP (msvc 2008)
CREDITS
We are grateful to Mike Cowlishaw et al. from IBM for making decNumber package
available. Further, Mr. Cowlishaw has kindly helped us while making
QDecimal production ready.
REFERENCES
[1] General Decimal Arithmetic Specification
http://speleotrove.com/decimal/decarith.html
[2] The decNumber Library
http://speleotrove.com/decimal/decnumber.html
[3] General Decimal Arithmetic
http://speleotrove.com/decimal
[4] QDecimal Project Home
http://code.google.com/p/qdecimal
Regards,
Semih Cemiloglu
semih (at) cemiloglu.org
PGP/GPG KeyId: FCEE9B7A on keyserver.pgp.com
Fingerprint: ED8F48028DE03BE0A2C95E0FACC5043BFCEE9B7A
qdecimal/doc/COPYRIGHT.txt
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=====================================================================
decNumber library is under separate licence which listed below:
ICU License - ICU 1.8.1 and later
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qdecimal/doc/INSTALL.txt
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BUILDING
~~~~~~~~
We now have two options to build QDecimal project.
A) SCons based build
B) Qmake/Make based build.
SCons is now the preferred method of building.
just type "scons" at the project root to build. type scons -h or -H to
see full options for build.
Qmake/Make based build is now deprecated, please use it as a last resort as
it will be discontinued near future:
Unix
~~~~
qmake -r
make
Use "make clean" to clean up intermediate (object etc.) files.
Use "make distclean" to return to clean state.
Windows
~~~~~~~
qmake -r
nmake
Use "nmake clean" to clean up intermediate (object etc.) files.
Use "nmake distclean" to return to clean state.
TESTING
~~~~~~~
Execute the "qdecimal_test" application in the bin directory, ie. "cd bin".
To execute the subset of the tests, just run
"qdecimal_test --testdir=tc_subset".
To execute the full set of the tests, just run
"qdecimal_test --testdir=tc_full".
Full test would have only 2 expected (fma) failures, whereas subset
test should not have any failure (grep -i fail / grep PASS).
SHARED LIBRARY
~~~~~~~~~~~~~~
a) Comment "CONFIG += static" line and uncomment the two lines
beginning with "CONFIG += shared"
in src/src.pro file.
b) In the client applications simply define QDECIMAL_SHARED macro as 1;
that is "DEFINES += QDECIMAL_SHARED=1"
c) At run-time, PATH (Windows) or LD_LIBRARY_PATH (Unix) environment
variables should be specified to locate the shared library.
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* The QDecimal Library
~~~~~~~~~~~~~~~~~~~~~~
Overview
~~~~~~~~
The QDecimal is a thin layer around IBM's decNumber library which implements the General Decimal Arithmetic Specification in ANSI C. [1]
This specification defines a decimal arithmetic which meets the requirements of commercial, financial, and human-oriented applications. It also matches the decimal arithmetic in the IEEE 754 Standard for Floating Point Arithmetic.
The decNumber library also matches the decimal arithmetic in the IEEE 754 Standard for Floating Point Arithmetic.
The QDecimal/decNumberlibrary [2] fully implements the specification, and hence supports integer, fixed-point, and floating-point decimal numbers directly, including infinite, NaN (Not a Number), and subnormal values. Both arbitrary-precision and fixed-size representations are supported.
The aim of the QDecimal library is to extend decNumber functionality to C++ language and Qt framework by using idioms, tecniques and best practices in both tecnologies. For instance, inline functions are used heavily to aid optimization, operator overloading and conversion operators are defined to aid type casting in between the types defined by QDecimal. Further these types are integrated with Qt object model by introducing them to Qt meta type system.
Following classes are defined by QDecimal library:
QDecNumber (based on decNumber):
decNumber module uses an arbitrary-precision decimal number representation designed for efficient computation in software and implements the arithmetic and logical operations, together with a number of conversions and utilities. Once a number is held as a decNumber, no further conversions are necessary to carry out arithmetic.
The decNumber representation is variable-length and machine-dependent (for example, it contains integers which may be big-endian or little-endian).
QDecNumber encapsulates decNumber and reimplements global functions that operates upon decNumber as member functions with the same name.
QDecContext (based on decContext):
Most functions in the decNumber module take as an argument a decContext structure, which provides the context for operations (precision, rounding mode, etc.) and also controls the handling of exceptional conditions (corresponding to the flags and trap enablers in a hardware floating-point implementation).
QDecSingle (based on decSingle/decimal32):
decimal32 is a 32-bit decimal floating-point representation which provides 7 decimal digits of precision in a compressed format.
decSingle module provides the functions for the decimal32 format; this format is intended for storage and interchange only and so the module provides utilities and conversions but no arithmetic functions.
QDecSingle encapsulates decSingle and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecDouble (based on decDouble/decimal64):
decimal64 is a 64-bit decimal floating-point representation which provides 16 decimal digits of precision in a compressed format.
decDouble module provides the functions for the decimal64 format; this format is an IEEE 754 basic format and so a full set of arithmetic and other functions is included.
QDecDouble encapsulates decDouble and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecQuad (based on decQuad/decimal128):
decimal128 is a 128-bit decimal floating-point representation which provides 34 decimal digits of precision in a compressed format.
decQuad module provides the functions for the decimal128 format; this format is an IEEE 754 basic format; it contains the same set of functions as decDouble.
QDecQuad encapsulates decQuad and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecPacked (based on decPacked):
The decPacked format is the classic packed decimal format implemented by IBM S/360 and later machines, where each digit is encoded as a 4-bit binary sequence (BCD) and a number is ended by a 4-bit sign indicator. The decPacked module accepts variable lengths, allowing for very large numbers (up to a billion digits), and also allows the specification of a scale.
QDecPacked augments decPacked by encapsulating reference counted byte
array and scale of the decimal point as members variables, thus, freeing up
user of this class from memory management and keeping track of scale value.
License
~~~~~~~
QDecimal is under the terms of the LGPL v2.1.
decNumber is under the terms of ICU v1.8.1
See COPYRIGHT file for terms of the these licenses.
Platforms
~~~~~~~~~
QDecimal should be usable in all platforms that Qt supports.
We regularly test on following platforms:
Solaris 11 x86 (sun studio 12.5)
Linux (Ubuntu x64 - gcc)
Linux (Ubuntu x86 - gcc)
Windows XP (msvc 2008)
Installation
~~~~~~~~~~~~~~
Read INSTALL.txt to build and install QDecimal.
Copyright
~~~~~~~~~
Copyright (C) 2012-2013 Semih Cemiloglu
Copyright (c) IBM Corporation, 2000, 2010. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details (COPYRIGHT.txt).
The decNumber library has separate license terms, which is governed by
ICU License -- ICU 1.8.1 and later.
Credits
~~~~~~~
We are grateful to Mike Cowlishaw et al. from IBM for making decNumber package
available. Mr. Cowlishaw has kindly helped while making QDecimal production
ready.
In memoriam
~~~~~~~~~~~
QDecimal library is dedicated to cherished memory of my late uncle:
Muharrem Saffet Bozkurt
He is sadly missed.
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/*
This file contains NO source code, just some documentation for doxygen to
parse.
(c) Semih Cemiloglu
*/
/*!
\mainpage QDecimal - Decimal Arithmetic Library for Qt Framework
The QDecimal is a thin layer around IBM's decNumber library which implements the General Decimal Arithmetic Specification in ANSI C. [1]
This specification defines a decimal arithmetic which meets the requirements of commercial, financial, and human-oriented applications. It also matches the decimal arithmetic in the IEEE 754 Standard for Floating Point Arithmetic.
The decNumber library also matches the decimal arithmetic in the IEEE 754 Standard for Floating Point Arithmetic.
The QDecimal/decNumberlibrary [2] fully implements the specification, and hence supports integer, fixed-point, and floating-point decimal numbers directly, including infinite, NaN (Not a Number), and subnormal values. Both arbitrary-precision and fixed-size representations are supported.
The aim of the QDecimal library is to extend decNumber functionality to C++ language and Qt framework by using idioms, tecniques and best practices in both tecnologies. For instance, inline functions are used heavily to aid optimization, operator overloading and conversion operators are defined to aid type casting in between the types defined by QDecimal. Further these types are integrated with Qt object model by introducing them to Qt meta type system.
Following classes are defined by QDecimal library:
QDecNumber (based on decNumber):
decNumber module uses an arbitrary-precision decimal number representation designed for efficient computation in software and implements the arithmetic and logical operations, together with a number of conversions and utilities. Once a number is held as a decNumber, no further conversions are necessary to carry out arithmetic.
The decNumber representation is variable-length and machine-dependent (for example, it contains integers which may be big-endian or little-endian).
QDecNumber encapsulates decNumber and reimplements global functions that operates upon decNumber as member functions with the same name.
QDecContext (based on decContext):
Most functions in the decNumber module take as an argument a decContext structure, which provides the context for operations (precision, rounding mode, etc.) and also controls the handling of exceptional conditions (corresponding to the flags and trap enablers in a hardware floating-point implementation).
QDecSingle (based on decSingle/decimal32):
decimal32 is a 32-bit decimal floating-point representation which provides 7 decimal digits of precision in a compressed format.
decSingle module provides the functions for the decimal32 format; this format is intended for storage and interchange only and so the module provides utilities and conversions but no arithmetic functions.
QDecSingle encapsulates decSingle and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecDouble (based on decDouble/decimal64):
decimal64 is a 64-bit decimal floating-point representation which provides 16 decimal digits of precision in a compressed format.
decDouble module provides the functions for the decimal64 format; this format is an IEEE 754 basic format and so a full set of arithmetic and other functions is included.
QDecDouble encapsulates decDouble and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecQuad (based on decQuad/decimal128):
decimal128 is a 128-bit decimal floating-point representation which provides 34 decimal digits of precision in a compressed format.
decQuad module provides the functions for the decimal128 format; this format is an IEEE 754 basic format; it contains the same set of functions as decDouble.
QDecQuad encapsulates decQuad and provides decNumber library functions that operates upon decSingle as member functions with the same name.
QDecPacked (based on decPacked):
The decPacked format is the classic packed decimal format implemented by IBM S/360 and later machines, where each digit is encoded as a 4-bit binary sequence (BCD) and a number is ended by a 4-bit sign indicator. The decPacked module accepts variable lengths, allowing for very large numbers (up to a billion digits), and also allows the specification of a scale.
QDecPacked augments decPacked by encapsulating reference counted byte
array and scale of the decimal point as members variables, thus, freeing up
user of this class from memory management and keeping track of scale value.
\section license License
QDecimal is under the terms of the LGPL v2.1.
decNumber is under the terms of ICU v1.8.1
See COPYRIGHT file for terms of the these licenses.
\section platforms Platforms
QDecimal should be usable in all platforms that Qt supports.
We regularly test on following platforms:
Solaris 11 x86 (sun studio 12.5)
Linux (Ubuntu x64 - gcc)
Linux (Ubuntu x86 - gcc)
Windows XP (msvc 2008)
\section credits Credits
We are grateful to Mike Cowlishaw et al. from IBM for making decNumber package
available.
\section references References
[1] <a href="http://speleotrove.com/decimal/decarith.html">General Decimal Arithmetic Specification</a>
[2] <a href="http://speleotrove.com/decimal/decnumber.html">The decNumber Library</a>
[3] <a href="http://speleotrove.com/decimal/">General Decimal Arithmetic</a>
[4] <a href="http://code.google.com/p/qdecimal/">QDecimal Project Home</a>
*/