Typed Value Construction Functions

AMPS includes functions for explicitly constructing constant values of various types.

Function	Parameters	Description
FALSE_VALUE	none	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.
TRUE_VALUE	none	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.
NAN_VALUE	none	Returns a NaN (not a number) value.
CHAR_VALUE	integer (0-255)	Returns the character (byte) for the integer provided. 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; for example, CHAR_VALUE(/code).