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Showing content from https://timsong-cpp.github.io/cppwp/n4659/bad.alloc below:

21 Language support library [language.support]

21 Language support library [language.support] 21.6 Dynamic memory management [support.dynamic] 21.6.3 Storage allocation errors [alloc.errors] 21.6.3.1 Class bad_­alloc [bad.alloc]
namespace std {
  class bad_alloc : public exception {
  public:
    bad_alloc() noexcept;
    bad_alloc(const bad_alloc&) noexcept;
    bad_alloc& operator=(const bad_alloc&) noexcept;
    const char* what() const noexcept override;
  };
}

The class bad_­alloc defines the type of objects thrown as exceptions by the implementation to report a failure to allocate storage.

bad_alloc() noexcept;

Effects: Constructs an object of class bad_­alloc.

bad_alloc(const bad_alloc&) noexcept; bad_alloc& operator=(const bad_alloc&) noexcept;

Effects: Copies an object of class bad_­alloc.

const char* what() const noexcept override;

Returns: An implementation-defined ntbs.


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