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std::bad_alloc(3) C++ Standard Libary std::bad_alloc(3) NAME std::bad_alloc - std::bad_alloc Synopsis Defined in header <new> class bad_alloc; std::bad_alloc is the type of the object thrown as exceptions by the allocation functions to report failure to allocate storage. std-bad alloc-inheritance.svg Inheritance diagram Member functions constructor constructs a new bad_alloc object (public member function) operator= replaces the bad_alloc object (public member function) what returns the explanatory string (public member function) std::bad_alloc::bad_alloc bad_alloc() throw(); (until C++11) bad_alloc() noexcept; (1) (since C++11) bad_alloc( const bad_alloc& other ) throw(); (2) (until C++11) bad_alloc( const bad_alloc& other ) noexcept; (since C++11) Constructs a new bad_alloc object with an implementation-defined null-terminated byte string which is accessible through what(). 1) Default constructor. 2) Copy constructor. If *this and other both have dynamic type std::bad_alloc then std::strcmp(what(), other.what()) == 0. (since C++11) Parameters other - another exception object to copy std::bad_alloc::operator= bad_alloc& operator=( const bad_alloc& other ) throw(); (until C++11) bad_alloc& operator=( const bad_alloc& other ) noexcept; (since C++11) Assigns the contents with those of other. If *this and other both have dynamic type std::bad_alloc then std::strcmp(what(), other.what()) == 0 after assignment. (since C++11) Parameters other - another exception object to assign with Return value *this std::bad_alloc::what virtual const char* what() const throw(); (until C++11) virtual const char* what() const noexcept; (since C++11) Returns the explanatory string. Parameters (none) Return value Pointer to a null-terminated string with explanatory information. The string is suitable for conversion and display as a std::wstring. The pointer is guaranteed to be valid at least until the exception object from which it is ob- tained is destroyed, or until a non-const member function (e.g. copy assignment operator) on the exception object is called. Notes Implementations are allowed but not required to override what(). Inherited from std::exception Member functions destructor destroys the exception object [virtual] (virtual public member function of std::exception) what returns an explanatory string [virtual] (virtual public member function of std::exception) Example // Run this code #include <iostream> #include <new> int main() { try { while (true) { new int[100000000ul]; } } catch (const std::bad_alloc& e) { std::cout << "Allocation failed: " << e.what() << '\n'; } } Possible output: Allocation failed: std::bad_alloc See also operator new allocation functions operator new[] (function) http://cppreference.com 2022.07.31 std::bad_alloc(3)
NAME | Synopsis | Member functions | Parameters | Parameters | Return value | Parameters | Return value | Notes | Member functions | Example | Possible output: | See also
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