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When a class dynamically allocates itself at constructor, why does stack overflow happen instead of std::bad_alloc?


Why should C++ programmers minimize use of 'new'?C++ std::bad_alloc from stack allocation?How Stack overflow exception occurs when property sets value to ItselfC++ copy constructor for class with dynamically allocated arrayCopy constructor throws a std::bad_alloc, when it is calledWhy does the C++ compiler create an object heap instead of pushing the class object in stack?Dynamically allocated memory storage clarificationWhy does a stack overflow occur at varying stack usage each run instead of a fixed amount?std::bad_alloc thrown on prime number taskC++ zero initialization - Why is `b` in this program uninitialized, but `a` is initialized?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;








7















I made a class that recursively creates itself using new (just for fun!), expecting that this will throw std::bad_alloc due to infinite dynamic allocation (heap overflow). But stack overflow happened instead of std::bad_alloc. Why does this happen?



class Overflow

private:
 Overflow* overflow;

public:
 Overflow()
 
 overflow = new Overflow();
 
;

int main()

 Overflow overflow_happens; // stack overflow happens instead of std::bad_alloc exeption






c++ stack-overflow bad-alloc







share|improve this question



















  • 1





    It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

    – François Andrieux
    9 hours ago












  • Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

    – Timo
    9 hours ago







  • 1





    That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

    – Tanveer Badar
    9 hours ago






  • 2





    @TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

    – François Andrieux
    9 hours ago






  • 1





    What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

    – Caleth
    8 hours ago


















7















I made a class that recursively creates itself using new (just for fun!), expecting that this will throw std::bad_alloc due to infinite dynamic allocation (heap overflow). But stack overflow happened instead of std::bad_alloc. Why does this happen?



class Overflow

private:
 Overflow* overflow;

public:
 Overflow()
 
 overflow = new Overflow();
 
;

int main()

 Overflow overflow_happens; // stack overflow happens instead of std::bad_alloc exeption






c++ stack-overflow bad-alloc







share|improve this question



















  • 1





    It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

    – François Andrieux
    9 hours ago












  • Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

    – Timo
    9 hours ago







  • 1





    That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

    – Tanveer Badar
    9 hours ago






  • 2





    @TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

    – François Andrieux
    9 hours ago






  • 1





    What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

    – Caleth
    8 hours ago














7












7








7








I made a class that recursively creates itself using new (just for fun!), expecting that this will throw std::bad_alloc due to infinite dynamic allocation (heap overflow). But stack overflow happened instead of std::bad_alloc. Why does this happen?



class Overflow

private:
 Overflow* overflow;

public:
 Overflow()
 
 overflow = new Overflow();
 
;

int main()

 Overflow overflow_happens; // stack overflow happens instead of std::bad_alloc exeption






c++ stack-overflow bad-alloc







share|improve this question
















I made a class that recursively creates itself using new (just for fun!), expecting that this will throw std::bad_alloc due to infinite dynamic allocation (heap overflow). But stack overflow happened instead of std::bad_alloc. Why does this happen?



class Overflow

private:
 Overflow* overflow;

public:
 Overflow()
 
 overflow = new Overflow();
 
;

int main()

 Overflow overflow_happens; // stack overflow happens instead of std::bad_alloc exeption






c++ stack-overflow bad-alloc




c++ stack-overflow bad-alloc






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 9 hours ago









NathanOliver

105k18150231




105k18150231










asked 9 hours ago









ownfosownfos

504




504







  • 1





    It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

    – François Andrieux
    9 hours ago












  • Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

    – Timo
    9 hours ago







  • 1





    That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

    – Tanveer Badar
    9 hours ago






  • 2





    @TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

    – François Andrieux
    9 hours ago






  • 1





    What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

    – Caleth
    8 hours ago













  • 1





    It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

    – François Andrieux
    9 hours ago












  • Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

    – Timo
    9 hours ago







  • 1





    That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

    – Tanveer Badar
    9 hours ago






  • 2





    @TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

    – François Andrieux
    9 hours ago






  • 1





    What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

    – Caleth
    8 hours ago








1




1





It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

– François Andrieux
9 hours ago






It's important to realize that new Overflow(); causes Overflow::Overflow() to be called.

– François Andrieux
9 hours ago














Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

– Timo
9 hours ago






Because you don't do a bad allocation you just run out of stack memory because of the recursive constructor calls.

– Timo
9 hours ago





1




1





That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

– Tanveer Badar
9 hours ago





That is implementation dependent race condition. Like if you take poison and also get shot there's a high chance you'll die but whether from poisoning or bleeding is a race condition.

– Tanveer Badar
9 hours ago




2




2





@TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

– François Andrieux
9 hours ago





@TanveerBadar While there is a "race" between running out of stack space and heap space, the term race condition has a strict definition in c++. So it's not accurate to say there is a race condition.

– François Andrieux
9 hours ago




1




1





What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

– Caleth
8 hours ago






What happens if you overflow = new Overflow[1000]? or 1000000, or 1000000000?

– Caleth
8 hours ago













2 Answers
2






active

oldest

votes


















15














The stack overflow is happening because you have infinite recursion. Calling Overflow() causes you to call Overflow() again and again and again. Those function calls need to go on the stack. Since your stack is smaller than your heap you'll run out of stack space for all of the those constructor calls before you run out of memory for all of the objects you are creating.






share|improve this answer






























    4














    Because you are recursively calling the constructor, a method, repeatedly. The method calls get pushed to the call stack. Since the stack size is much smaller than the available heap, the call stack overflows before the heap runs out.






    share|improve this answer


















    • 1





      I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

      – formerlyknownas_463035818
      9 hours ago











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    2 Answers
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    2 Answers
    2






    active

    oldest

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    active

    oldest

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    active

    oldest

    votes









    15














    The stack overflow is happening because you have infinite recursion. Calling Overflow() causes you to call Overflow() again and again and again. Those function calls need to go on the stack. Since your stack is smaller than your heap you'll run out of stack space for all of the those constructor calls before you run out of memory for all of the objects you are creating.






    share|improve this answer



























      15














      The stack overflow is happening because you have infinite recursion. Calling Overflow() causes you to call Overflow() again and again and again. Those function calls need to go on the stack. Since your stack is smaller than your heap you'll run out of stack space for all of the those constructor calls before you run out of memory for all of the objects you are creating.






      share|improve this answer

























        15












        15








        15







        The stack overflow is happening because you have infinite recursion. Calling Overflow() causes you to call Overflow() again and again and again. Those function calls need to go on the stack. Since your stack is smaller than your heap you'll run out of stack space for all of the those constructor calls before you run out of memory for all of the objects you are creating.






        share|improve this answer













        The stack overflow is happening because you have infinite recursion. Calling Overflow() causes you to call Overflow() again and again and again. Those function calls need to go on the stack. Since your stack is smaller than your heap you'll run out of stack space for all of the those constructor calls before you run out of memory for all of the objects you are creating.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 9 hours ago









        NathanOliverNathanOliver

        105k18150231




        105k18150231























            4














            Because you are recursively calling the constructor, a method, repeatedly. The method calls get pushed to the call stack. Since the stack size is much smaller than the available heap, the call stack overflows before the heap runs out.






            share|improve this answer


















            • 1





              I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

              – formerlyknownas_463035818
              9 hours ago















            4














            Because you are recursively calling the constructor, a method, repeatedly. The method calls get pushed to the call stack. Since the stack size is much smaller than the available heap, the call stack overflows before the heap runs out.






            share|improve this answer


















            • 1





              I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

              – formerlyknownas_463035818
              9 hours ago













            4












            4








            4







            Because you are recursively calling the constructor, a method, repeatedly. The method calls get pushed to the call stack. Since the stack size is much smaller than the available heap, the call stack overflows before the heap runs out.






            share|improve this answer













            Because you are recursively calling the constructor, a method, repeatedly. The method calls get pushed to the call stack. Since the stack size is much smaller than the available heap, the call stack overflows before the heap runs out.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 9 hours ago









            Avin KavishAvin Kavish

            2,101214




            2,101214







            • 1





              I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

              – formerlyknownas_463035818
              9 hours ago












            • 1





              I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

              – formerlyknownas_463035818
              9 hours ago







            1




            1





            I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

            – formerlyknownas_463035818
            9 hours ago





            I like the answer, though I think this is not quite accurate: "Since the stack size is much smaller than the available heap...." because calling the constructor once does not require the same amount of heap as it requires stack,

            – formerlyknownas_463035818
            9 hours ago

















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