迭代通过结构变量 [英] Iterate through struct variables

问题描述

我想获得一个迭代器到结构变量，在运行时根据枚举ID设置一个特定的。例如 -

I want to get an iterator to struct variable to set a particular one on runtime according to enum ID. for example -

struct {
char _char;
int _int;
char* pchar;
};

enum {
_CHAR, //0
_INT,  //1
PCHAR  //2
};

int main()
{
    int i = 1; //_INT
    //if i = 1 then set variable _int of struct to some value.
}

如果没有if / else或switch case语句， >

can you do that without if/else or switch case statements?

推荐答案

不，C ++不直接支持这种方法。

No, C++ doesn't support this directly.

使用 boost :: tuple 执行非常类似的操作：

You can however do something very similar using boost::tuple:

enum {
CHAR, //0
INT,  //1
DBL   //2
};

tuple<char, int, double> t('b', 1, 3.14);

int i = get<INT>(t);  // or t.get<INT>()

您可能还需要查看< a href =http://www.boost.org/doc/libs/1_42_0/doc/html/variant.html> boost :: variant 。

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