| Typedefs | |
| typedef QL_INTEGER | Integer | 
| integer number | |
| typedef QL_BIG_INTEGER | BigInteger | 
| large integer number | |
| typedef unsigned QL_INTEGER | Natural | 
| positive integer | |
| typedef QL_REAL | Real | 
| real number | |
| typedef Real | Decimal | 
| decimal number | |
| typedef std::size_t | Size | 
| size of a container | |
| typedef Real | Time | 
| continuous quantity with 1-year units | |
| typedef Real | DiscountFactor | 
| discount factor between dates | |
| typedef Real | Rate | 
| interest rates | |
| typedef Real | Spread | 
| spreads on interest rates | |
| typedef Real | Volatility | 
| volatility | |
| typedef Real | Probability | 
| probability | |
A number of numeric types are defined in order to add clarity to function and method declarations.