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Asked: 2026-06-04T21:24:13+00:00

I have a C++ class that I would like to use in my Objective-C

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I have a C++ class that I would like to use in my Objective-C project. Without #including any C++ headers, when I rename my Obj-C files from “.m” to “.mm”, and thus switch the compiler, the compiler produces a whole bunch of malloc errors:

double * pointValues = malloc(sizeof(double *)*numOfPts);

error: invalid conversion from 'void*' to 'double*'

Suddenly all lines with malloc become invalid.
Do I have to typecast “malloc” when using the Obj-C++ compiler, or is this a manifestation of some other issue?

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1 Answer

  1. Editorial Team

    In C++, there is no implicit conversion from void* to other pointer types, so you have to explicitly cast.
    Not only with the objective-C++ compiler.

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