Floating-point number utility functions
Floating-point utility function provide run-time functions for handling floating-point number types defined within a schema. More...
Functions | |
| EXTERNRT OSREAL | rtxGetMinusInfinity (OSVOIDARG) |
| Returns the IEEE negative infinity value. | |
| EXTERNRT OSREAL | rtxGetMinusZero (OSVOIDARG) |
| Returns the IEEE minus zero value. | |
| EXTERNRT OSREAL | rtxGetNaN (OSVOIDARG) |
| Returns the IEEE Not-A-Number (NaN) value. | |
| EXTERNRT OSREAL | rtxGetPlusInfinity (OSVOIDARG) |
| Returns the IEEE posative infinity value. | |
| EXTERNRT OSBOOL | rtxIsMinusInfinity (OSREAL value) |
| A utility function that compares the given input value to the IEEE 754 value for negative infinity. | |
| EXTERNRT OSBOOL | rtxIsMinusZero (OSREAL value) |
| A utility function that compares the given input value to the IEEE 754 value for minus zero. | |
| EXTERNRT OSBOOL | rtxIsNaN (OSREAL value) |
| A utility function that compares the given input value to the IEEE 754 value for Not-A-Number (NaN). | |
| EXTERNRT OSBOOL | rtxIsPlusInfinity (OSREAL value) |
| A utility function that compares the given input value to the IEEE 754 value for positive infinity. | |
| EXTERNRT OSBOOL | rtxIsApproximate (OSREAL a, OSREAL b, OSREAL delta) |
| A utility function that return TRUE when first number are approximate to second number with given precision. | |
| EXTERNRT OSBOOL | rtxIsApproximateAbs (OSREAL a, OSREAL b, OSREAL delta) |
| A utility function that return TRUE when first number are approximate to second number with given absolute precision. | |
Detailed Description
Floating-point utility function provide run-time functions for handling floating-point number types defined within a schema.
Function Documentation
| EXTERNRT OSREAL rtxGetMinusInfinity | ( | OSVOIDARG | ) |
Returns the IEEE negative infinity value.
This is defined as 0xfff0000000000000 in IEEE standard 754. We assume the presence of the IEEE double type, that is, 64-bits of precision.
| EXTERNRT OSREAL rtxGetMinusZero | ( | OSVOIDARG | ) |
Returns the IEEE minus zero value.
This is defined as 0x8000000000000000 in IEEE standard 754. We assume the presence of the IEEE double type, that is, 64-bits of precision.
| EXTERNRT OSREAL rtxGetNaN | ( | OSVOIDARG | ) |
Returns the IEEE Not-A-Number (NaN) value.
This is defined as 0x7ff8000000000000 in IEEE standard 754. We assume the presence of the IEEE double type, that is, 64-bits of precision.
| EXTERNRT OSREAL rtxGetPlusInfinity | ( | OSVOIDARG | ) |
Returns the IEEE posative infinity value.
This is defined as 0x7ff0000000000000 in IEEE standard 754. We assume the presence of the IEEE double type, that is, 64-bits of precision.
| EXTERNRT OSBOOL rtxIsApproximate | ( | OSREAL | a, | |
| OSREAL | b, | |||
| OSREAL | delta | |||
| ) |
A utility function that return TRUE when first number are approximate to second number with given precision.
- Parameters:
-
a The input real value. b The input real value. delta difference must be low than delta * a 1E-7 - set best precision for float; 1E-15 - set best precision for double.
| EXTERNRT OSBOOL rtxIsApproximateAbs | ( | OSREAL | a, | |
| OSREAL | b, | |||
| OSREAL | delta | |||
| ) |
A utility function that return TRUE when first number are approximate to second number with given absolute precision.
- Parameters:
-
a The input real value. b The input real value. delta difference must be low than delta
| EXTERNRT OSBOOL rtxIsMinusInfinity | ( | OSREAL | value | ) |
A utility function that compares the given input value to the IEEE 754 value for negative infinity.
- Parameters:
-
value The input real value.
| EXTERNRT OSBOOL rtxIsMinusZero | ( | OSREAL | value | ) |
A utility function that compares the given input value to the IEEE 754 value for minus zero.
- Parameters:
-
value The input real value.
| EXTERNRT OSBOOL rtxIsNaN | ( | OSREAL | value | ) |
A utility function that compares the given input value to the IEEE 754 value for Not-A-Number (NaN).
- Parameters:
-
value The input real value.
| EXTERNRT OSBOOL rtxIsPlusInfinity | ( | OSREAL | value | ) |
A utility function that compares the given input value to the IEEE 754 value for positive infinity.
- Parameters:
-
value The input real value.