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CArray—Wolfram Documentation

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"CArray"::[type]

represents an array type compatible with C, containing elements of the specified type.

• "CArray" can be used in Typed and related constructs to specify a type.
• Objects with type "CArray" are not automatically memory managed and must be manually freed.
• "CArray"::[t] is equivalent to t* in C.
• "CArray" can be used when interfacing with external libraries that are compatible with C.
• Internally, objects with type "CArray" are represented with pointers.

• Information[carr,"ElementType"] for carr of type "CArray"::[type] gives type .
• FromRawPointer[carr,offset] indexes the C array carr. Indexes start with 0.

• Indexing is an unsafe operation, and indexing past the end of a C array can lead to crashes.

Create a memory-managed C array, and then access one of its elements:

Represent a function from an external library that takes a C array as an argument:

Compile a program that creates a C array and calls the function:

Compile a program that creates a C array and then frees it:

C arrays created outside of a "Managed" object are not automatically memory managed, and must be freed manually. Compile a function that creates unmanaged C arrays:

The function leaks memory:

Use DeleteObject to manually free the C arrays:

The resulting function does not leak memory:

Introduced in 2022 (13.1)

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