Strange seg fault

[Ali Çehreli]

On 06/12/2013 01:12 PM, gedaiu wrote:

 > Hi,
 >
 > Can anyone help me why this code goes wrong? I get exit code 139 with
 > DMD 2.063
 >
 >
 > import std.stdio;
 >
 >
 >
 > struct Test {
 >      string val = "";
 >      string[] key;
 >
 >      /**
 >       * operator "=" overload
 >       */
 >      Test opAssign(string val){
 >          this.val = val;
 >
 >          string[1] t;
 >          t = val;
 >
 >          key ~= t;

Instead of the last three lines:

     key ~= val;

However, if you really wanted a 1-element fixed-length array then:

     string[1] t = [ val ];

 >          return this;
 >      }
 >

Remove the following opAssign altogether:

 >      Test opAssign(Test val){
 >          this.val = val.val;
 >
 >          key ~= val.key;
 >
 >          return this;
 >      }

As general rules:

* Define a post-blit only if the code would be incorrect if you don't do 
that. (For example, it may be incorrect that two objects share the same 
array.)

* Define an opAssign from the same type only if your implementation will 
be more efficient than the compiler's safe alternative, which happens to 
be "first copy, then swap." For example, instead of copying a member 
array, you may decide to reuse it.

 >      void append(Test t) {
 >          val ~= t.val;
 >          key ~= t.key;
 >      };
 > }
 >
 > void main() {
 >
 >      Test val;
 >      val = "test";
 >
 >      Test[string] data;
 >      Test v;
 >      v = "asd";
 >      data["test"] = v;
 >
 >      writeln(v);
 >      writeln(data["test"]);
 >
 >      data["test"].append(val);
 >
 >
 >      writeln(data["test"].key);
 >      writeln("done");
 > }
 >
 > Thanks,
 > Bogdan

Ali