Standard library header <new>

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

Functions
allocation functions
(function)
deallocation functions
(function)
(C++11)
 obtains the current new handler
(function)
registers a new handler
(function)
(C++17)
 pointer optimization barrier
(function template)
Classes
exception thrown when memory allocation fails
(class)
(C++11)
 exception thrown on allocation of array with invalid length
(class)
tag type used to select an non-throwing allocation function
(class)
(C++17)
 type used to pass alignment to alignment-aware allocation and deallocation functions
(class)
(C++20)
 tag type used to identify destroying-delete overloads of operator delete
(class)
Types
function pointer type of the new handler
(typedef)
Objects
an object of type nothrow_t used to select an non-throwing allocation function
(constant)
(C++17)
 min offset to avoid false sharing
max offset to promote true sharing
(constant)

Synopsis

namespace std {
  class bad_alloc;
  class bad_array_new_length;
  struct destroying_delete_t {
    explicit destroying_delete_t() = default;
  };
  inline constexpr destroying_delete_t destroying_delete{};
  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;
  template <class T> constexpr T* launder(T* p) noexcept;
  inline constexpr size_t
    hardware_destructive_interference_size = /*implementation-defined*/ ;
  inline constexpr size_t
    hardware_constructive_interference_size = /*implementation-defined*/ ;
}
 
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;
void* operator new (std::size_t size, void* ptr) noexcept;
void* operator new[](std::size_t size, void* ptr) noexcept;
void operator delete (void* ptr, void*) noexcept;
void operator delete[](void* ptr, void*) noexcept;

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