A warnning in ' char * title="" '

ROOT
1

Dear all:

When I try to launch a code:

TH1* pro3d(TH3 * hist, char * option, double fr, double to, char * title="", TPad * pad=0)

warning: ISO C++11 does not allow conversion from string literal to ‘char *’ [-Wwritable-strings]
…hist, char * option, double fr, double to, char * title="", TPad * pad=0)

Look like the warning come from ’ char * title="" '
How to avoid this warning?

Best wishes

2

TH1 *pro3d(TH3 *hist, const char *option, double fr, double to, const char *title = “”, TPad *pad = 0)