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Standard library header <new>

From cppreference.com
< cpp‎ | header
 
C++
 
Standard library headers
 

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

Contents

 [hide] 

Classes

 exception thrown when memory allocation fails
(class) [edit]
(C++11)
 exception thrown on allocation of array with invalid length
(class) [edit]
(C++17)
 type used to pass alignment to alignment-aware allocation and deallocation functions
(enum) [edit]

Types

 function pointer type of the new handler
(typedef) [edit]

Tags

 a tag used to select a non-throwing allocation function
(tag)[edit]
(C++20)
 a tag used to select destroying-delete overloads of operator delete
(tag)[edit]

Constants

(C++17)
 min offset to avoid false sharing
max offset to promote true sharing
(constant) [edit]

Functions

 allocation functions
(function) [edit]
deallocation functions
(function) [edit]
(C++11)
 obtains the current new handler
(function) [edit]
registers a new handler
(function) [edit]
(C++17)
 pointer optimization barrier
(function template) [edit]

[edit] Synopsis

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;
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