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Standard library header <new> - cppreference.com

This header is part of the dynamic memory management library, in particular provides low level memory management features.

// all freestanding
namespace std {
  // storage allocation errors
  class bad_alloc;
  class bad_array_new_length;
 
  struct destroying_delete_t
  {
    explicit destroying_delete_t() = default;
  };
  inline constexpr destroying_delete_t destroying_delete{};
 
  // global operator new control
  enum class align_val_t : size_t
  {
  };
 
  struct nothrow_t
  {
    explicit nothrow_t() = default;
  };
  extern const nothrow_t nothrow;
 
  using new_handler = void (*)();
  new_handler get_new_handler() noexcept;
  new_handler set_new_handler(new_handler new_p) noexcept;
 
  // pointer optimization barrier
  template<class T> constexpr T* launder(T* p) noexcept;
 
  // hardware interference size
  inline constexpr size_t hardware_destructive_interference_size =
    /* implementation-defined */;
  inline constexpr size_t hardware_constructive_interference_size =
    /* implementation-defined */;
}
 
// storage allocation and deallocation
void*
operator new(std::size_t size);
void*
operator new(std::size_t size, std::align_val_t alignment);
void*
operator new(std::size_t size, const std::nothrow_t&) noexcept;
void*
operator new(std::size_t size,
             std::align_val_t alignment,
             const std::nothrow_t&) noexcept;
 
void
operator delete(void* ptr) noexcept;
void
operator delete(void* ptr, std::size_t size) noexcept;
void
operator delete(void* ptr, std::align_val_t alignment) noexcept;
void
operator delete(void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
void
operator delete(void* ptr, const std::nothrow_t&) noexcept;
void
operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
 
void*
operator new[](std::size_t size);
void*
operator new[](std::size_t size, std::align_val_t alignment);
void*
operator new[](std::size_t size, const std::nothrow_t&) noexcept;
void*
operator new[](std::size_t size,
               std::align_val_t alignment,
               const std::nothrow_t&) noexcept;
 
void
operator delete[](void* ptr) noexcept;
void
operator delete[](void* ptr, std::size_t size) noexcept;
void
operator delete[](void* ptr, std::align_val_t alignment) noexcept;
void
operator delete[](void* ptr, std::size_t size, std::align_val_t alignment) noexcept;
void
operator delete[](void* ptr, const std::nothrow_t&) noexcept;
void
operator delete[](void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept;
 
constexpr void*
operator new(std::size_t size, void* ptr) noexcept;
constexpr void*
operator new[](std::size_t size, void* ptr) noexcept;
void
operator delete(void* ptr, void*) noexcept;
void
operator delete[](void* ptr, void*) noexcept;

namespace std {
  class bad_alloc : public exception
  {
  public:
    // see description for the specification of the special member functions
    constexpr const char* what() const noexcept override;
  };
}

namespace std {
  class bad_array_new_length : public bad_alloc
  {
  public:
    // see description for the specification of the special member functions
    constexpr const char* what() const noexcept override;
  };
}

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