OnlineGDB

online compiler and debugger for c/c++

code. compile. run. debug. share.

Language

main.cpp

#include <iostream> #include <string> struct expr_t { virtual ~expr_t() {} }; struct ident_t : public expr_t { std::string name; ident_t(std::string name) : name(name) {} }; //moved the 2nd overload above first overload std::string to_string(ident_t& v) { return v.name; } std::string to_string(expr_t& v) { if (auto* id = dynamic_cast<ident_t*>(&v)) { return to_string(*id); //now compiler knows about std::string to_string(ident_t& v) } return "error"; } int main() { expr_t* b = new ident_t("c"); std::cout << to_string(*b) << std::endl; // segfault delete b; return 0; }

close ad [x]

Compiling Program...

Command line arguments:

Standard Input: Interactive Console Text

Program is not being debugged. Click "Debug" button to start program in debug mode.

Call Stack

#	Function	File:Line

Local Variables

Variable	Value

Registers

Register	Value

Display Expressions

Expression	Value

Breakpoints and Watchpoints

	#	Description