This is a library for debugging interactive problems, you can run interactor completely inside your program so that you can debug your program easily.
It captures cin/cout and stdin/stdout and forward them to your interactor function, which is a coroutine.
- Launch easily, so don't need to setup pipes or anything.
- Share variables, so you can inspect variables in your interactor function.
- Log interactions, so you can see what happened between your program and interactor.
- Automatically count interactions, so you can see how many interactions happened.
- Deadlock detection, so you can see if your program forgets to output something.
- Error spreading, so the whole program will be terminated if an error occurs in either the program or the interactor.
This library only works on Linux x86_64 and Linux aarch64. The major difficulty porting to Windows is lacking fopencookie()/funopen() function to create custom FILE*.
#include <iostream>
#include <string>
int main() {
int l = 0, r = 1000;
while (l < r) {
int m = (l + r + 1) / 2;
std::cout << "? " << m << std::endl;
std::string s;
std::cin >> s;
if (s == "<") {
r = m - 1;
} else {
l = m;
}
}
std::cout << "! " << l << std::endl;
}
#ifndef ONLINE_JUDGE
#include "interactlib.hh"
static cave::Interactor interactor([](auto &test) {
test.set_max_count(15); // Set Maximum Interaction Count. It will abort if the interaction count exceeds this value.
int val;
test.sys_cin >> val; // Read the number to guess from terminal
while (true) {
std::string op;
test >> op; // Read from the program
if (op == "?") {
int x;
test >> x; // Read the guess from the program
if (val < x) {
test << "<" << std::endl; // Send the response to the program
} else {
test << ">=" << std::endl; // Send the response to the program
}
} else {
int x;
test >> x; // Read the guess from the program
if (x == val) {
test.sys_cout << "Correct" << std::endl; // Send the response to the terminal
break;
} else {
test.sys_cout << "Incorrect" << std::endl; // Send the response to the terminal
abort();
}
}
}
});
#endif