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

21 Language support library [language.support]

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.

namespace std {
  class bad_array_new_length : public bad_alloc {
  public:
    bad_array_new_length() noexcept;
    const char* what() const noexcept override;
  };
}

The class bad_­array_­new_­length defines the type of objects thrown as exceptions by the implementation to report an attempt to allocate an array of size less than zero or greater than an implementation-defined limit ([expr.new]).

bad_array_new_length() noexcept;

Effects: constructs an object of class bad_­array_­new_­length.

const char* what() const noexcept override;

Returns: An implementation-defined ntbs.

using new_handler = void (*)();

The type of a handler function to be called by operator new() or operator new[]() ([new.delete]) when they cannot satisfy a request for additional storage.

Required behavior: A new_­handler shall perform one of the following:

• make more storage available for allocation and then return;

• throw an exception of type bad_­alloc or a class derived from bad_­alloc;

• terminate execution of the program without returning to the caller.

new_handler set_new_handler(new_handler new_p) noexcept;

Effects: Establishes the function designated by new_­p as the current new_­handler.

Returns: The previous new_­handler.

Remarks: The initial new_­handler is a null pointer.

new_handler get_new_handler() noexcept;

Returns: The current new_­handler. [ Note: This may be a null pointer value.  — end note ]

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