Re: Using arrays of function pointers in D

[John Colvin via Digitalmars-d-learn]

On Thursday, 21 May 2015 at 16:23:15 UTC, John wrote:

I've been rewriting one of my emulators in D and am fairly new to the language. I'm having trouble finding documentation on creating/initializing/use of arrays of function pointers in D. If anyone has a code example I'd appreciate it!

float foo(int a, float b)
{
    import std.stdio;
    writeln(a, b);
    return a+b;
}

void main()
{
    float function(int, float)[] arrayOfFPs;

    arrayOfFPs = new float function(int, float)[42];

    arrayOfFPs[0] = &foo;

    auto r = arrayOfFPs[0](3, 7.6);
    assert(r == 3+7.6f);

    alias DT = int delegate(int);

    int a = 4;
    auto arrayOfDelegates = new DT[3];
    arrayOfDelegates[1] = (int x) => a + x;
    assert(arrayOfDelegates[1](3) == 7);
}