string Q

I have a recurring code section that writes data files to a specific directory.
../../Data_x_r/PR2/Scheme_2_TVD_1/. Can i specify as a string "'constant" so that I only change it once rather going through every instance and changing it. Hope I am clear

Code:

---

    stringstream ss;
    string file_name;

    ss << "surface_z_" << Hori_L/Diameter << "D_PR_" << P_r << "Pe_Ma_" << Mach << "_Time_" << timer1 << ".dat";
    file_name = ss.str();

 
    ofstream plotdata(("../../Data_x_r/PR2/Scheme_2_TVD_1/"+file_name).c_str());

---

Shuo

Code:

---

  const string outfile = "../../Data_x_r/PR2/Scheme_2_TVD_1/";

---

Edit: outfile is a bad name, outdir would be better.

Code:

---

string file_path = "../../Data_x_r/PR2/Scheme_2_TVD_1/"+file_name;

---

?

But to answer your question maybe:

I'm not sure that a constant string is completely appropriate, expecially if you have to loop these statements repeatedly. I know that open()'s fist argument is passed as a constant, so you probably have nothing to worry about (in terms of the data changing) in this context.