Constant Block

Declares a constant block or a constant block bundle using the keyword constant.

• Declaration
• Shorthand Declaration
• Ports Table
• Description
• Code Examples

---

Declaration

# constant block
constant LABEL {
        value:  none
        meta:   none
}

# constant block bundle
constant LABEL [SIZE] {
        value:  none
        meta:   none
}

LABEL

definition:the label of the block

SIZE

definition:the size of the block bundle type:constant integer port (CIP)

---

Shorthand Declaration

# constant block
BasicType >> LABEL;

# constant block bundle
BasicTypeList >> LABEL;

LABEL

definition:the label of the block

BasicType

definition:an integer, a real, or a string

BasicTypeList

definition:a list of integer, a list of real, or a list of string

---

Ports Table

Port	Name	Direction	Type	Connection	Access	Default	Required
1	output	output	CIP, CRP, CSP (2)	multiple	LABEL >>	none	no (1)
					assignment
2	value	input	CIP, CRP, CSP	single	>> LABEL	none	yes
					property
3	meta	input	CSP	single	property	none	no

CIP

constant integer port

CRP

constant real port

CSP

constant string port

¹ Warning issued during compilation if the port is left unconnected.

² The port’s type is the same as value port’s type.

---

Description

A constant block can be assigned one of the basic types. Its value is assigned during declaration. Its output port type is the same as its value port type.

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Code Examples

The following code declares a constant block called ‘SamplingRate’. The value property is assigned an Integer. The output port type of the block is constant integer.

constant SamplingRate {
        value:  2048
        meta:   'The sampling rate for analog input.'
}

# Shorthand Declaration
2048 >> SamplingRate;

The following code declares a constant block called ‘StandardPitch’. The value property is assigned a Real. The output port type of the block is constant real.

constant StandardPitch {
        value:  440.0
        meta:   'The musical pitch for all instrument.'
}

# Shorthand Declaration
440.0 >> StandardPitch;

The following code declares a constant block called ‘OutgoingIP’. The value property is assigned a String. The output port type of the block is constant string.

constant OutgoingIP {
        value:  '192.168.1.13'
        meta:   'The IP address of the server.'
}

# Shorthand Declaration
'192.168.1.13' >> OutgoingIP;

The following code declares a constant block bundle called ‘Frequencies’. The value property is assigned a Real list. The output port type of the block is constant real.

constant Frequencies [2] {
        value:  [440.0, 880.0]
        meta:   'Frequencies of A4 and A5.'
}

# Shorthand Declaration
[440.0, 880.0] >> Frequencies;