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Foreachkey语句

警告
UnigineScript已过时,将在以后的版本中删除。请考虑切换到C#/ C ++,因为这些API是首选。无法保证UnigineScipt中新引擎功能的可用性,因为当前的支持水平仅假设解决关键问题。

foreachkey架构提供另一种方法对矢量贴图进行迭代。通过这种语句为每个索引或所给容器内的键执行某些代码。

语法

源代码 (UnigineScript)
foreachkey(key_variable; map; loop_increment) {
	// some_code;
 }

部分

  • key_variable为当前间(或索引)。内部容器的游标会移至下一个键值对(或者索引项)所在处。
  • key_variable的类型无关紧要。
  • 每个迭代的最后执行loop_increment,此为可选选项。

示例

  • 源代码 (UnigineScript)
    int map[] = ( "begin" : "flower", "middle" : "fruit", "end" : "tree" );
    foreachkey(int i; map) {
    	log.message("%s\t=>\t%s\n",i,map[i]);
    }
    结果为:
    输出
    begin   =>      flower
    end     =>      tree
    middle  =>      fruit
  • 源代码 (UnigineScript)
    int map[] = ( "begin" : "flower", "middle" : "fruit", "end" : "tree" );
    foreachkey(int i, j = 0; map; j++) {
    	log.message("%d: %s\t=>\t%s\n",j,i,map[i]);
    }
    结果为:
    输出
    0: begin   =>      flower
    1: end     =>      tree
    2: middle  =>      fruit
注意
在执行之前,以升序的方式将键存储起来。

foreachkey模块内部键的更改不会影响到贴图,但可直接更改值。

源代码 (UnigineScript)
int map[] = ( "begin" : "flower", "middle" : "fruit", "end" : "tree" );
foreachkey(int i; map) {
	i = "first";	// 贴图不受影响
	map[i] = -9.6;	// 贴图发生变化
}

嵌套foreachkey#

如果在另一个foreachkey结构内调用了foreachkey 结构,对于每个模块而言应将每个贴图的副本存储起来。(这种方法需要的性能更高。)

源代码 (UnigineScript)
int map[] = ( "1" : "head", "2" : "foot" );

int copy[];
copy.copy(map);

foreachkey(int i; map) {
	foreachkey(int j; copy)	// foreachkey(int j; map)会生成一个错误
	{
		log.message("%s\t->\t%s\t%s\t->\t%s\n",i,map[i],j,map[j]);
	}
}
此示例的输出结果为:
输出
1	->	head	1	->	head
1	->	head    2	->	foot
2	->	foot	1	->	head
2	->	foot	2	->	foot
最新更新: 2017-07-03