Generate (lazily, then cache) the named C function and return it as a
typed function pointer. Fn is the function-pointer type to retrieve,
e.g. int function(int, int); its linkage and attributes are normalized,
so the returned pointer is always extern(C) ... nothrow @nogc. A
zero-parameter function is just get!(int function()).
Generate (lazily, then cache) the named C function and return it as a typed function pointer. Fn is the function-pointer type to retrieve, e.g. int function(int, int); its linkage and attributes are normalized, so the returned pointer is always extern(C) ... nothrow @nogc. A zero-parameter function is just get!(int function()).