使用字符串引用C ++中的变量

Question

Is it even possible to use a string to reference a variable in c++? Note that this is a wrapper around ac project.

I have an incoming message that looks like with data populated in all 3 variables:

struct {
  char[20] var_a;
  char[20] var_b;
  char[20] var_c;
} data_type;

Additionally, I have another incoming message that can either be a string of "var_a", "var_b", or "var_c"

Is there anyway I can extract the data based on my incoming message.

For example

char new[20] = str2var("var_a")

Where str2var is just there to represent what I am trying to do. The size of the message and the data are already defined, I just need the ability to select which data to pull out based on another function.

Any other ideas to accomplish this goal are welcomed.

Answer 1

From what you described, you should be able to index the last character, and just use a case statement.

char[20] m2;  // second message

switch (m2[4]) {

  case 'a':
    // use var_a
    break;

  case 'b':
    // use var_b
    break;

  case 'c':
    // use var_c
    break;

  default:
    // error
    break;
}