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Templates and functions are parameterised. The syntax for parameters is defined by the grammar for Parameters:
In contrast to global and local declarations, the parameter list should not be terminated by a semicolon.
Call by Reference and Call by Value
Parameters can be declared to have either call-by-value or call-by-reference semantics. The syntax is taken from C++, where the identifier of a call-by-reference parameter is prefixed with an ampersand in the parameter declaration. Call-by-value parameters are not prefixed with an ampersand.
Clocks and channels must always be reference parameters.
Note: Array parameters must be prefixed with an ampersand to be passed by reference, this does not follow the C semantics.
- P(clock &x, bool bit)
process template P has two parameters: the clock x and the boolean variable bit.
- Q(clock &x, clock &y, int i1, int &i2, chan
&a, chan &b)
process template Q has six parameters: two clocks, two integer variables (with default range), and two channels. All parameters except i1 are reference parameters.