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    Standard library header <new>

    From zh.cppreference.net
    C++
    Standard library headers

    此头文件属于 动态内存管理 库的一部分，特别提供了 底层内存管理 功能。

    目录

    类

    		内存分配失败时抛出的异常
    (类)
    (C++11)
    		分配长度无效的数组时抛出的异常
    (类)
    (C++17)
    		用于将对齐方式传递给对齐感知分配和释放函数的类型
    (枚举)

    类型

    		新处理函数的函数指针类型
    (类型定义)

    标签

    		用于选择不抛异常的 分配函数 的标签
    (标签)
    (C++20)
    		用于选择 operator delete 的销毁删除重载的标签
    (标签)

    常量

    (C++17)
    		避免伪共享的最小偏移量
    促进真共享的最大偏移量
    (常量)

    函数

    		分配函数
    (函数)
    		释放函数
    (函数)
    (C++11)
    		获取当前的新处理函数
    (函数)
    		注册新处理函数
    (函数)
    (C++17)
    		指针优化屏障
    (函数模板)

    概要

    // 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;
constexpr void
operator delete(void* ptr, void*) noexcept;
constexpr void
operator delete[](void* ptr, void*) noexcept;