How should I be passing in a float pointer to a C ...

# kotlin-native

[Adam S]

How should I be passing in a float pointer to a C function?

Here’s the C code I’m trying to translate:

void SetValue(const void *value, int type);

void main() {
    float runTime = 0.0f;

    while (true) {
        runTime++
        SetValue(&runTime, SET_VALUE_TYPE_RUNTIME);
        
        float target[3] = { 1.0f, 2.0f, 3.0f };
        SetValue(target, SET_VALUE_TYPE_TARGET);
    }
}

It makes sense to use cValuesOf(1f, 2f, 3f) for the target, since target is an array. But should I use cValuesOf(runtime) for a single number?

[Jeff Lockhart]

Does this work?

fun main() {
    memScoped {
        val runTime = alloc<FloatVar>()
        while (true) {
            runTime.value++
            SetValue(runTime.ptr, SET_VALUE_TYPE_RUNTIME)

            val target = allocArrayOf(1f, 2f, 3f)
            SetValue(target, SET_VALUE_TYPE_TARGET)
        }
    }
}

I think cValuesOf() is immutable.