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based on an earlier version of the Wolfram Language.
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MathLink C Function

MLReleaseReal32Array()

void MLReleaseReal32Array(MLINK link, float *a, int *dims, char **heads, int d)
disowns the memory allocated by MLGetReal32Array()to store the array a, its dimensions dims and the heads heads.
  • MLReleaseReal32Array() is declared in the MathLink header file mathlink.h.
#include "mathlink.h"

/* read an array of single-precision floating-point numbers from a link and then release the memory to MathLink for deallocation */

void f(MLINK lp)
{
    float *data;
    int *dimensions;
    char **heads;
    int depth;

    if(! MLGetReal32Array(lp, &data, &dimensions, &heads))
        { /* Unable to get the array from lp */ }

    /* ... */

    MLReleaseReal32Array(lp, data, dimensions, heads, depth);
}