DataDapperExample.d

/* Example DataDapper Model */

class User {
  struct Properties {
    DD_Property!(int,"id") id;
    DD_Property!(string,"username") username;
    DD_Property!(double,"score") score;
  }
  Properties properties;

  mixin(DD_Property_GetterSetter!(int,"id"));
  mixin(DD_Property_GetterSetter!(string,"username"));
  mixin(DD_Property_GetterSetter!(double,"score"));
  mixin DD_toString;
}


/* Behind the Curtain */

struct DD_Property(T, string s) {
  string name = s;
  T value;
}

template DD_Type(T) {
  static if (is(T == int)) {
    const char[] DD_Type = "int";
  } else static if (is(T == double)) {
    const char[] DD_Type = "double";
  } else static if (is(T == string)) {
    const char[] DD_Type = "string";
  }
}

template DD_Property_Getter(PropType, const char[] PropMethod) {
  const char[] DD_Property_Getter =
    DD_Type!(PropType) ~ " " ~ PropMethod ~ "() { return this.properties." ~ PropMethod ~ ".value; } \n";
}

template DD_Property_Setter(PropType, const char[] PropMethod) {
  const char[] DD_Property_Setter =
    "void " ~ PropMethod ~ "(" ~ DD_Type!(PropType) ~ " _v) { this.properties." ~ PropMethod ~ ".value = _v; }\n";
}

template DD_Property_GetterSetter(PropType, const char[] PropMethod) {
  const char[] DD_Property_GetterSetter =
    DD_Property_Getter!(PropType, PropMethod) ~
    DD_Property_Setter!(PropType, PropMethod);
}

template DD_toString() {
  string toString() {
    string r = "Model Object:\n";
    foreach (i, E; this.properties.tupleof)
      r = r ~ "  " ~ E.name ~ " = " ~ to!string(E.value) ~ "\n";
    return r;
  }
}