playground.mojo

alias dtype = DType.float64

struct MyStruct:
    var ptr : DTypePointer[dtype]
    var len:Int

    fn __init__(inout self, len:Int):
        self.len = len
        self.ptr = DTypePointer[dtype].alloc(len)

    fn __copyinit__(inout self, borrowed existing:Self):
        print("> __copyinit__()")
        self.len = existing.len
        self.ptr = DTypePointer[dtype].alloc(self.len)
        for i in range(self.len):
            self.ptr[i] = existing.ptr[i]

    fn __moveinit__(inout self, owned existing:Self):
        print("> __moveinit__()")
        self.len = existing.len
        self.ptr = existing.ptr
        
    fn __del__(owned self):
        print("> __del__()")
        self.ptr.free()

fn do_something_meaningful(owned val:Float64):
    print("amount donated to Modular:", val,"$")

fn main():
    print("$ var a = MyStruct(10)")
    var a = MyStruct(10)
    
    print("$ a.ptr[0] = 37")
    a.ptr[0] = 37
    
    print("$ do_something_meaningful(a.ptr[0])")
    do_something_meaningful(a.ptr[0])