Purpose: Decimal data type support, for COBOL-like fixed-point
operations on currency/money values.
Author: Piotr Likus
Created: 03/01/2011
Modified: 29/07/2012
Licence: BSD
Version: 1.3
This data type is designed to perform calculation with on-fly roundings
& to support correct compare function (floating-point compare is
unreliable).
Values are stored internally using 64-bit integer, so maximum number of
digits is 18.
Precision is user-defined, so you can use this data type for currency
rates.
To store decimal in file you can use "unbiased" functions.
Example usage:
#include "decimal.h"
using namespace dec;
// the following declares currency variable with 2 decimal points
// initialized with integer value (can be also floating-point)
decimal<2> value(143125);
// to use non-decimal constants you need to convert them to decimal
value = value / decimal_cast<2>(333.0);
// output values
cout << "Result is: " << value << endl;
// this should display something like "429.80"
// to mix decimals with different precision use decimal_cast
decimal<6> exchangeRate(12.1234);
value = decimal_cast<2>(decimal_cast<6>(value) * exchangeRate);
cout << "Result 2 is: " << value << endl;
// this should display something like "5210.64"
cout << "Result 2<6> is: " << decimal_cast<6>(value) << endl;
// this should display something like "5210.640000"
Directory structure:
\doc - documentation
\include - headers
\test - unit tests, Boost-based
Tested compilers:
- VS2010 Express SP1
- Code::Blocks 10.05 + MinGW + gcc 4.5