On Monday, 27 June 2016 at 22:00:15 UTC, gummybears wrote:
Hi,
Today thought lets learn D. I am writing a compiler for a
language
and read D compiles very fast.
Switched my compiler from C++ to D and ran my test suite to use
D.
Doing somethin wrong as creating array of objects gives me a
segmentation fault
Example
import std.stdio;
class Pair {
float x;
float y;
this() { x = 0; y = 0; }
}
void main() {
Pair[] arr;
// segmentation fault on next line
arr = new Pair[](10);
arr[0].x = 3;
arr[0].y = 4;
writef("arr[0] = (%f,%f)",arr[0].x,arr[0].y);
}
You've allocated an array of 10 objects but didn't put any
objects into it, so each of the entries is null (since classes
are reference types in D). The line after the allocation fails as
you try to access a null object.
Either fill out the array with new objects (`arr[0] = new
Pair()`), or convert Pair to a struct (structs are value types).
