Typed Value Creation
AMPS includes functions for explicitly constructing constant values of various types.
FALSE_VALUE
FALSE_VALUE
FALSE_VALUE()
Returns a boolean false value. This function is most useful for constructing values in message types that have a distinct type for boolean values. In the AMPS expression language, false is equivalent to a literal 0.
Parameters
None.
Returns
A boolean false value.
TRUE_VALUE
TRUE_VALUE
TRUE_VALUE()
Returns a boolean true value. This function is most useful for constructing values in message types that have a distinct type for boolean values. In the AMPS expression language, true is typically represented with a literal 1.
Parameters
None.
Returns
A boolean true value.
NAN_VALUE
CHAR_VALUE
CHAR_VALUE
CHAR_VALUE(integer)
Returns the character (byte) for the integer provided (0-255). This function is most useful for constructing values in message types that have a distinct type for char values.
In the AMPS expression language, a single character value is equivalent to a string constructed with an escape, and constructing a string literal is more efficient. That is, '\x01' is more efficient in a filter or field construction than CHAR_VALUE(1). However, to construct a character based on a field, use CHAR_VALUE.
Parameters
integer: An integer between 0 and 255.
Returns
The character corresponding to the integer.