xgboost::IntrusivePtr< T > 类模板参考

侵入式指针的实现。一种智能指针，指向带有嵌入式引用计数器的对象。底层对象必须实现一个友元函数 IntrusivePtrRefCount()，该函数返回引用计数器（类型为 IntrusivePtrCell）。侵入式指针比 std::shared_ptr<> 更快：std::shared_ptr<> 会为引用计数器进行额外的内存分配，而侵入式指针则不会。更多...

#include <intrusive_ptr.h>

xgboost::IntrusivePtr< T > 的协作图

类
struct	Hash

公共类型
using	元素类型 = T

公共成员函数
	IntrusivePtr (T *p)
	从裸指针构造一个 IntrusivePtr。IntrusivePtr 获得所有权。更多...
	IntrusivePtr () noexcept=default
	IntrusivePtr (IntrusivePtr const &that)
	IntrusivePtr (IntrusivePtr &&that) noexcept
	~IntrusivePtr ()
IntrusivePtr< T > &	operator= (IntrusivePtr< T > const &that)
IntrusivePtr< T > &	operator= (IntrusivePtr< T > &&that) noexcept
void	重置 ()
void	重置 (元素类型 *that)
元素类型 &	operator* () const noexcept
元素类型 *	operator-> () const noexcept
元素类型 *	get () const noexcept
	operator bool () const noexcept
int32_t	引用计数 () noexcept
void	交换 (IntrusivePtr< T > &that) noexcept

保护属性
T *	ptr_ {nullptr}

详细描述

template<typename T>
class xgboost::IntrusivePtr< T >

侵入式指针的实现。一种智能指针，指向带有嵌入式引用计数器的对象。底层对象必须实现一个友元函数 IntrusivePtrRefCount()，该函数返回引用计数器（类型为 IntrusivePtrCell）。侵入式指针比 std::shared_ptr<> 更快：std::shared_ptr<> 会为引用计数器进行额外的内存分配，而侵入式指针则不会。

class ForIntrusivePtrTest {
 public:
  mutable class IntrusivePtrCell ref;
  float data { 0 };
 
  friend IntrusivePtrCell &
  IntrusivePtrRefCount(ForIntrusivePtrTest const *t) noexcept { // NOLINT
    return t->ref;
  }
 
ForIntrusivePtrTest() = default;
ForIntrusivePtrTest(float a, int32_t b) : data{a + static_cast<float>(b)} {}
 
  explicit ForIntrusivePtrTest(NotCopyConstructible a) : data{a.data} {}
};
 
IntrusivePtr<ForIntrusivePtrTest> ptr {new ForIntrusivePtrTest};

成员类型定义文档

元素类型

template<typename T >

using xgboost::IntrusivePtr< T >::元素类型 = T

构造函数和析构函数文档

IntrusivePtr() [1/4]

template<typename T >

xgboost::IntrusivePtr< T >::IntrusivePtr ( T *  p )

inlineexplicit

从裸指针构造一个 IntrusivePtr。IntrusivePtr 获得所有权。

参数

p

指向对象的裸指针

IntrusivePtr() [2/4]

template<typename T >

xgboost::IntrusivePtr< T >::IntrusivePtr ( )

defaultnoexcept

IntrusivePtr() [3/4]

template<typename T >

xgboost::IntrusivePtr< T >::IntrusivePtr ( IntrusivePtr< T > const &  that )

inline

IntrusivePtr() [4/4]

template<typename T >

xgboost::IntrusivePtr< T >::IntrusivePtr ( IntrusivePtr< T > &&  that )

inlinenoexcept

~IntrusivePtr()

template<typename T >

xgboost::IntrusivePtr< T >::~IntrusivePtr ( )

inline

成员函数文档

get()

template<typename T >

元素类型* xgboost::IntrusivePtr< T >::get ( ) const

inlinenoexcept

operator bool()

template<typename T >

xgboost::IntrusivePtr< T >::operator bool ( ) const

inlineexplicitnoexcept

operator*()

template<typename T >

元素类型& xgboost::IntrusivePtr< T >::operator* ( ) const

inlinenoexcept

operator->()

template<typename T >

元素类型* xgboost::IntrusivePtr< T >::operator-> ( ) const

inlinenoexcept

operator=() [1/2]

template<typename T >

IntrusivePtr<T>& xgboost::IntrusivePtr< T >::operator= ( IntrusivePtr< T > &&  that )

inlinenoexcept

operator=() [2/2]

template<typename T >

IntrusivePtr<T>& xgboost::IntrusivePtr< T >::operator= ( IntrusivePtr< T > const &  that )

inline

重置() [1/2]

template<typename T >

void xgboost::IntrusivePtr< T >::重置 ( )

inline

重置() [2/2]

template<typename T >

void xgboost::IntrusivePtr< T >::重置 ( 元素类型 *  that )

inline

交换()

template<typename T >

void xgboost::IntrusivePtr< T >::交换 ( IntrusivePtr< T > &  that )

inlinenoexcept

引用计数()

template<typename T >

int32_t xgboost::IntrusivePtr< T >::引用计数 ( )

inlinenoexcept

成员数据文档

ptr_

template<typename T >

T* xgboost::IntrusivePtr< T >::ptr_ {nullptr}

protected

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