Constant system function
calls are calls to certain built-in system
functions where the arguments are constant expressions. When used in constant expressions,
these function calls shall be evaluated at elaboration time. The system
functions that may be used in constant system function calls are pure
functions, i.e., those whose value depends only on their input arguments and
which have no side effects. Specifically, the system functions allowed in
constant expressions are the conversion system functions listed in 19.5 and the
mathematical system functions listed in 19.8.
Constant system function
calls are calls to certain built-in system
functions where the arguments are constant
expressions meet conditions outlined below.
When used in constant expressions, these function calls shall be evaluated at
elaboration time. The system functions that may be used in constant system
function calls are pure functions, i.e., those whose value depends only on
their input arguments and which have no side effects. Specifically, the system functions allowed in constant
expressions are the conversion system functions listed in 19.5 and the mathematical
system functions listed in 19.8.
Certain built-in system functions where the arguments are constant
expressions are constant system function calls. Specifically, these are the
conversion system functions listed in 19.5 and the mathematical system functions
listed in 19.8.
The data query system functions listed in 19.6 and the array query
system functions listed in 19.7 are normally also constant system function
calls even when their arguments are not constant. See those sections for the
conditions under which these query system function calls are considered to be
constant expressions.