Reserved Keywords

Generator keywords are reserved for internal use. Do not use them in models as identifiers or function names. Also avoid using C reserved keywords in models as identifiers or function names. If your model contains reserved keywords, the code generator attempts to replace those keywords when it generates identifiers in the code. If the code generator cannot replace the reserved keyword, then the generated code uses reserved keywords as identifiers and might not compile. To avoid generating identifiers that do not match identifiers in your model, do not use reserved keywords as identifiers.

Note

You can register additional reserved identifiers in the Simulink^® environment. For more information, see Specify Reserved Names for Generated Identifiers.

C Reserved Keywords

These are the reserved keywords that the C language specifies. The code generator attempts to rename identifiers that match these keywords.

`auto`	`double`	`int`	`struct`
`break`	`else`	`long`	`switch`
`case`	`enum`	`register`	`typedef`
`char`	`extern`	`return`	`union`
`const`	`float`	`short`	`unsigned`
`continue`	`for`	`signed`	`void`
`default`	`goto`	`sizeof`	`volatile`
`do`	`if`	`static`	`while`

C++ Reserved Keywords

These are the reserved keywords that the C++ language specifies in addition to the C reserved keywords. If you generate C++ code, the code generator attempts to rename identifiers that match these keywords.

`bool`	`false`	`protected`	`try`
`catch`	`friend`	`public`	`typeid`
`class`	`inline`	`reinterpret_cast`	`typename`
`const_cast`	`mutable`	`static_cast`	`using`
`delete`	`namespace`	`template`	`virtual`
`dynamic_cast`	`new`	`this`	`wchar_t`
`explicit`	`operator`	`throw`
`export`	`private`	`true`

Other Common Reserved Keywords

The code generator attempts to replace some keywords that are not part of the C or C++ language specification. See examples of some of these keywords in this table.

`abs`	`int16_T`	`MAX_uint8_T`*	`RT_MALLOC`
`asm`	`int32_T`	`MAX_uint16_T`*	`rtInf`
`boolean_T`	`int64_T`	`MAX_uint32_T`*	`rtMinusInf`
`byte_T`	`INTEGER_CODE`	`MAX_uint64_T`	`rtNaN`
`char_T`	`LINK_DATA_BUFFER_SIZE`	`MIN_int8_T`*	`SeedFileBuffer`
`cint8_T`	`LINK_DATA_STREAM`	`MIN_int16_T`*	`SeedFileBufferLen`
`cint16_T`	`localB`	`MIN_int32_T`*	`single`
`cint32_T`	`localC`	`MIN_int64_T`	`TID01EQ`
`creal_T`	`localDWork`	`MODEL`	`time_T`
`creal32_T`	`localP`	`MT`	`tm`
`creal64_T`	`localX`	`NCSTATES`	`uint_T`
`cuint8_T`	`localXdis`	`NULL`	`uint8_T`
`cuint16_T`	`localXdot`	`NUMST`	`uint16_T`
`cuint32_T`	`localZCE`	`pointer_T`	`uint32_T`
`ERT`	`localZCSV`	`PROFILING_ENABLED`	`uint64_T`
`fortran`	`matrix`	`PROFILING_NUM_SAMPLES`	`UNUSED_PARAMETER`
`HAVESTDIO`	`MAX_int8_T`*	`real_T`	`USE_RTMODEL`
`id_t`	`MAX_int16_T`*	`real32_T`	`VCAST_FLUSH_DATA`
`int_T`	`MAX_int32_T`*	`real64_T`	`vector`
`int8_T`	`MAX_int64_T`	`RT`
*Not reserved if you specify a replacement identifier.

Code Generation Code Replacement Library Keywords

The list of code replacement library reserved keywords for your development environment varies depending on which libraries are registered. The list of available code replacement libraries varies depending on other installed products (for example, a target product), or if you used Embedded Coder^® to create and register custom code replacement libraries.

To generate a list of reserved keywords for libraries currently registered in your environment, use this MATLAB^® function:

lib_ids = RTW.TargetRegistry.getInstance.getTflReservedIdentifiers()

This function returns an array of library keywords. Specifying the input argument is optional.

Note

To list the libraries currently registered in your environment, use the MATLAB command crviewer.

To generate a list of reserved keywords for a specific library that you are using to generate code, call the function passing the name of the library as displayed in the Code replacement library menu on the Code Generation > Interface pane of the Configuration Parameters dialog box. For example,

lib_ids = RTW.TargetRegistry.getInstance.getTflReservedIdentifiers('GNU C99 extensions')

Here is a partial example of the function output:

>> lib_ids = ...
   RTW.TargetRegistry.getInstance.getTflReservedIdentifiers('GNU C99 extensions')

lib_ids = 

    'exp10'
    'exp10f'
    'acosf'
    'acoshf'
    'asinf'
    'asinhf'
    'atanf'
    'atanhf'
...
    'rt_lu_cplx'
    'rt_lu_cplx_sgl'
    'rt_lu_real'
    'rt_lu_real_sgl'
    'rt_mod_boolean'
    'rt_rem_boolean'
    'strcpy'
    'utAssert'

Note

Some of the returned keywords appear with the suffix $N, for example, 'rt_atan2$N'. $N expands into the suffix _snf only if nonfinite numbers are supported. For example, 'rt_atan2$N' represents 'rt_atan2_snf' if nonfinite numbers are supported and 'rt_atan2' if nonfinite numbers are not supported. As a precaution, you should treat both forms of the keyword as reserved.