Code interface packaging (subcomponent)

Package generated code interface for model subcomponent as reusable or nonreusable functions or as a C++ class

Since R2025a

Model Configuration Pane: Code Generation / Interface

Description

The Code interface packaging (subcomponent) parameter specifies how the code generator packages generated C or C++ interface code for subcomponents (model references).

Settings

Reusable function (default) | Nonreusable function | C++ class
Reusable function

Generates reusable, multi-instance code for the subcomponent that is reentrant. This setting is the default when Language is set to C.

To enable this value, set the Total number of instances allowed per top model parameter to Multiple. When Total number of instances allowed per top model is set to Multiple, this value is automatically selected.

You cannot select Reusable function if the subcomponent contains a subsystem that:

  • Has the subsystem block parameter Function packaging configured as Nonreusable function.

  • Assigns a global storage class to an output signal.

Nonreusable function

Generates nonreusable code for the subcomponent. The code generator allocates model data structures statically. Generated entry-point functions access the data structures directly.

To enable this value, set the Total number of instances allowed per top model parameter to Zero or One. When Total number of instances allowed per top model is set to Zero or One, this value is automatically selected.

You cannot select Nonreusable function for the subcomponent while the Code interface packaging (component) parameter for the root model is set to Reusable function.

If the System target file parameter is set to an ERT-based system target file:

  • Selecting Nonreusable function enables the Implement root-level I/O as parameter. Use Implement root-level I/O as to control how root-level input and output arguments are passed to subcomponent model entry-point functions. For instance, you can pass the arguments individually or as global variables.

C++ class

Generates a C++ class interface for the subcomponent. The generated interface encapsulates required model data into C++ class attributes and model entry-point functions into C++ class methods.

This setting is the default when Language is set to C++.

If the Code interface packaging (component) parameter is set to C++ class, this value is automatically configured, and no other values are allowed.

For a model configured with a service code interface, this parameter setting is not relevant and thus is not supported.

Recommended Settings

ApplicationSetting
DebuggingNo impact
TraceabilityNo impact
EfficiencyReusable function or C++ class
Safety precautionNo impact

Programmatic Use

Parameter: SubcomponentCodeInterfacePackaging
Type: character vector
Values:'C++ class' | 'Nonreusable function' | 'Reusable function'
Default: 'Reusable function' if TargetLang is set to 'C'; 'C++ class' if TargetLang is set to 'C++'

Version History

Introduced in R2025a

See Also

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