Stdbadalloc

Stdbadalloc is not an official symbol in the C++ standard library. In practice, the term is sometimes used informally to refer to the memory allocation failure condition described by the standard exception std::bad_alloc. The correct official name is std::bad_alloc, defined in the header <new>. The term stdbadalloc may appear in documentation, discussions, or code where developers shorthand or misspell the exception type.

Std::bad_alloc is an exception type that signals that a memory allocation has failed. It is part of the C++ exception hierarchy and is typically thrown by operator new and operator new[] when a request for memory cannot be satisfied. If the nothrow variant of operator new is used, allocation failures return nullptr instead of throwing std::bad_alloc. The what() member function usually returns a message such as "bad_alloc," indicating the nature of the failure.

Handling this exception involves catching std::bad_alloc, most often to attempt recovery or to terminate gracefully. Programs may also install a custom handler with std::set_new_handler to perform cleanup, release memory, or take other remedial action before subsequent allocation attempts.

Impact and scope: std::bad_alloc can propagate through code that uses standard containers (such as vector, string, or map) and allocator-backed memory operations when allocations fail during growth or construction. Correct usage emphasizes writing exception-safe code, providing fallback paths, or using nothrow semantics in contexts where failure should be handled without exceptions.

Notes: The term stdbadalloc is generally a casual reference or misspelling; the authoritative type to rely on in portable C++ code remains std::bad_alloc.