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bad_alloc in C++

  • Difficulty Level : Medium
  • Last Updated : 27 Feb, 2018

Prerequisite : Exceptions in C++

Standard C++ contains several built-in exception classes. The most commonly used is bad_alloc, which is thrown if an error occurs when attempting to allocate memory with new.

This class is derived from exception.

To make use of bad_alloc, one should set up the appropriate try and catch blocks. Here’s a short example, that shows how it’s used :


// CPP code for bad_alloc
#include <iostream>
#include <new>
// Driver code
int main () {
     int* gfg_array = new int[100000000];
  catch (std::bad_alloc & ba)
     std::cerr << "bad_alloc caught: " << ba.what();
  return 0;

RunTime error :
bad_alloc caught: std::bad_alloc
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