What Is The Std::bad_alloc Exception In C++?

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Exceptions in C++ are run-time anomalies or abnormal conditions that a program encounters during its execution. C++ provides the following specialized keywords for exception handling:

try: represents a block of code that can throw an exception.

catch: represents a block of code that is executed when a particular exception is thrown.

Definition

std::bad_alloc is a type of exception that occurs when the new operator fails to allocate the requested space. This type of exception is thrown by the standard definitions of ​operator new (declaring a variable) and operator new[] (declaring an array) when they fail to allocate the requested storage space.

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Code

The following code displays the error message shown when std::bad_alloc is thrown.

#include <iostream> #include <new> // Driver code int main () { try { int * myarray = new int[1000000000000]; } catch (std::bad_alloc & exception) { std::cerr << "bad_alloc detected: " << exception.what(); } return 0; } Run

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