初化d构

auto ms1 = MyStruct(10, 11);// struct literal,一般简单.
  MyStruct ms2 = {10, 11};    // C-style, not preferred
  MyStruct ms3 = {b:11, a:10};// Named initializers

立刻初化完:

import std.stdio;

  struct Point {
      int x, y;

      string toString() {
          import std.format : format;

          return format("(%d, %d)", x, y);
      }
  }

  void main() {
      Point[2] ps = [{0,0}, {4,4}];
      foreach (p; ps) writeln(p);
  }

自定义:

#! /usr/bin/env rdmd
  import std.stdio;

  struct X {
      int a;

      this(int x) {
          a = x * 2;
      }
  }

  void main() {
      auto test = X(22);
      writeln(test.a);
  }

output: 44

struct Foo {
    int x;

    this(int a, int b) { x = a + b; }//有它,foo(a)就不行,无它,就可以
}

struct S
{
    int x;
}

auto s = S(42);

改成:

struct S
{
    int x;
    int y;
}

auto s = S(42);
//仍然编译
struct S
{
    string s;
    int i;
}

auto s = S("hello", 42);

struct S
{
    string s;
    int foo;
    int i;
}

auto s = S("hello", 42);//编译不过

struct S
{
    int x;
    int y;
}

auto s = S(12, 99);

//构字面量导致漏洞.应声明构造器.

struct S
{
    int y;
    int x;
}

auto s = S(12, 99);