The below code just pops an empty queue. Shouldn't that be caught with the debugger? #include<iostream> #include<queue> #include<vector> #include <utility> int main(){ int n;std::cin>>n; std::vector<int> a(n); std::priority_queue<int> q1, q; for(int i=0;i<n;++i){ std::cin>>a[i]; q1.push(a[i]); // q.push(a[i]); } q.pop(); return 0; }

Although you could get a habit of having .at() on debug

You mean? int a = arr #ifdef DEBUG .at( #else [ #endif 6 #ifdef DEBUG ) #else ] #endif ; 😂

No

The below code just pops an empty queue. Shouldn't that be caught with the debugger? #include<iostream> #include<queue> #include<vector> #include <utility> int main(){ int n;std::cin>>n; std::vector<int> a(n); std::priority_queue<int> q1, q; for(int i=0;i<n;++i){ std::cin>>a[i]; q1.push(a[i]); // q.push(a[i]); } q.pop(); return 0; }

Can I learn C++ leaving C ?

The below code just pops an empty queue. Shouldn't that be caught with the debugger? #include<iostream> #include<queue> #include<vector> #include <utility> int main(){ int n;std::cin>>n; std::vector<int> a(n); std::priority_queue<int> q1, q; for(int i=0;i<n;++i){ std::cin>>a[i]; q1.push(a[i]); // q.push(a[i]); } q.pop(); return 0; }

Yes, I've learnt C++ without prior knowledge of C (and still don't know much of C after 7 years working with C++, and don't need to).

Can I learn C++ leaving C ?

yes. they are unrelated (but everything you learn helps)

I want to learn about security which languages with help

Form where u have learned ?

no idea sorry

Form where u have learned ?

there's a lot of online tutorials, i use sometimes geekforgeeks or cppreference

I've started from shitty books like "C++ for hackers" 🤦‍♂ There wasn't much choice back then (I didn't have good internet access), right now there are plenty of good books. Other guys can give good suggestions, also there were notes about books somewhere in this chat bots.

Thnx all for your help

i would say start with Lippman's book

Can u provide link ?

Ohk I will buy .

Debugger is pretty the same. I've just run gdb a.out and thats it

The below code just pops an empty queue. Shouldn't that be caught with the debugger? #include<iostream> #include<queue> #include<vector> #include <utility> int main(){ int n;std::cin>>n; std::vector<int> a(n); std::priority_queue<int> q1, q; for(int i=0;i<n;++i){ std::cin>>a[i]; q1.push(a[i]); // q.push(a[i]); } q.pop(); return 0; }

Easy: Program received signal SIGSEGV, Segmentation fault. 0x0000555555555578 in query_up (x=500, y=1) at main.cpp:130 130 x = par[x][0]; //Then move to its parent, that means we changed chains

(don't forget to run it after start)

after start?

Yeah it catches it. but why didn't it catch for queue.pop()? Any reason?

What exactly should it catch in that case?

I'm popping an empty queue, so may be that's an exception i guess?

isn't there any provision to catch it?

Queue is an adaptor, which can be implemented based on deque. Than pop will be implemented using deque::pop_front(), which is no throwing method. Calling it on empty container is UB.

Queue is an adaptor, which can be implemented based on deque. Than pop will be implemented using deque::pop_front(), which is no throwing method. Calling it on empty container is UB.

ok so debuggers don't catch UB that's why?

UB cannot be catched by debuggers. You can try using ubsan

Just to ask, do you recommend to use any flags to catch something that the debugger might not catch?

Also this: bool onlyEvensInArray(){ int numbers[2]; for (int index = 0; index <= 2; ++index) { if (numbers[index] % 2 == 0) return true; } return false; }

Just try with empty vector and something like v[0]

@chandradeepdey Actually, I was just relying on lldb a.out to work for it but seems like that's not the case as was described in the comment I'm replying. BTW, apart from the -fsanitize=address flag, what other flags should I turn on to make it quick to debug the code rather than the debugger skipping it?

Then there will be no need to say popfront because it's in the defination of queue to use pop from front and push from rear.. You are explaining dequeue, there is need to define pop_front() and pop_back() and push_front() and push_back() violating the law of normal queue (ie. Front can be used for pop and push both an rear can be used for pop and push both in dequeue)

read the sanitizer manuals. you cannot use them all at once

@ars_bond Any reason for this. I still can't believe why this wasn't caught.

Just to confirm, you mean many variants of -fsantizer-... cannot be used together. Right?

Caught what?

i would sugget watching Jason Turner's playlist on intro to C++ tools

array index out of bounds. OH that's UB. That's why. Right?

Yep

Compile it with ubsan, run and enjoy

How do I increment an lvalues pointer destination?

How do I increment an lvalues pointer destination?

Value at that adress

But after having done that I need to increass the pointer by 7, in the same line