Question

I need to create an exception handling, in that I also asked to print the status of the operation like

“file open : The operation completed successfully”

“file close: The operation completed successfully”,

etc.

Is there any macro for this like __LINE__,__FUNCTION__,__FILE__?

Or is there any boost function available to do this?

Answer 1

I think the answer is that you want to stringify the expression you are evaluating?

Code:

#include <stdexcept>
#include <sstream>
#include <iostream>

void check_result(bool result, const char* file, int line_number, const char* line_contents)
{
    if (!result) {
        //for example:
        std::stringstream ss;
        ss << "Failed: " << line_contents << " in " << file << ' ' << line_number;
        throw std::runtime_error(ss.str());
    }
}

#define CALL_AND_CHECK(expression) check_result((expression), __FILE__, __LINE__, #expression)

bool foobar(bool b) { return b; }

int main()
{
    try {
        CALL_AND_CHECK(foobar(true));
        CALL_AND_CHECK(foobar(false));
    } catch (const std::exception& e) {
        std::cout << e.what() << '\n';
    }
}