How can I evaluate an equation within a String?

How can i evaluate string expression in if statement?

• I want to evaluate string expression in if stmt. E.g. int i = 0,j = 2; char * str = "(i == 0) || (j == 2)"; if(str) /* This should execute code within if condition*/ { ... }

• Answer:

  You will need to write a mini parse to recognize and evaluate the sequence of characters in the string as an expression belonging to some grammar. Perhaps use a parser library to do this; for example Spirit which is part of Boost. http://www.boost.org/doc/libs/1_37_0/libs/spirit/classic/index.html