d構造器不工作

原文

struct Time {
    public int hours, minutes, seconds;
    this(int h, int m, int s) {
        hours = h;
        minutes = m;
        seconds = s;
    }
    Time opBinary(string op : "=")(int secos) {
        assert(secos <= 86_400);
        return new Time(secos / 3600, (secos % 3600) / 60, secos % 60);
    }
}
//
module testfortime;
import time;
import std.stdio;

void main() {
    Time time = 360;
    write(time.hours);
    readln;
}
//dmd -run testfortime.d
//不能用(int)調用.      

我認為您想要​

​opAssign​

​​而不是​

​opBinary​

​​.

還有一個錯誤,因為它是結構,​​

​構造和傳回​

​它時你不想更新它.

return new Time(secos / 3600, (secos % 3600) / 60, secos % 60);      

将傳回​

​Time*​

​​,而非​

​Time​

​.

這樣,更常見:

auto time = Time(360);
//或
const time = Time(360);
//不可指派.      

this(int h, int m = 0, int s = 0)      

struct Time {
  public int hours, minutes, seconds;

  // 不需要構造器
  void opAssign(int secos) {
    assert(secos <= 86_400);
    hours = secos / 3600;
    minutes = (secos % 3600) / 60;
    seconds = secos % 60;
  }
}

import std.stdio;

void main() {
  auto time = Time(360);
  time = 12_345;
  writeln(time);
  readln;
}