What is the std::bad_alloc exception in C++?
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.
Code
The following code displays the error message shown when std::bad_alloc is thrown.
#include <iostream>#include <new>// Driver codeint main () {try{int * myarray = new int[1000000000000];}catch (std::bad_alloc & exception){std::cerr << "bad_alloc detected: " << exception.what();}return 0;}
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