在需要与C语言库交互的场景或者系统底层代码中【需要程序员手动管理内存】。#include<iostream>voiduseRaw...
对于shared pointer，这个内部指针所指向的对象，并不是实际的对象(Widget indirectly)，而是再包了一层。
Created a shared Derived (as a pointer to Base) p.get() =0x2299b30, p.use_count() =1Shared ownership between3threads and released ownership from main: p.get() =0, p.use_count() =0local pointer in a thread: lp.get() =0x2299b30, lp.use_count() =5local pointer in a thread:...
Unique Pointer The second type of Smart Pointer available in C++. The difference between the Unique Pointer and the shared Pointer is that unlike shared, where an object can have multiple shared pointers, only one unique pointer can be pointing to an object at any given time. Hence the name...
unique_ptr的赋值机制允许在特定情况下安全地重用指针，通过std::move()函数实现所有权转移。它不能像常规指针那样调用delete，因为所有权由智能指针自动管理。shared_ptr提供了丰富的成员函数，如use_count()查看引用计数、swap交换对象所有权等。其线程安全特性使其在多线程环境中尤其有用。weak_ptr旨在...
}intmain(){// std::make_unique是c++14才有std::unique_ptr<Foo> pf =std::make_unique<Foo>(10);// unique_ptr的复制构造函数和拷贝构造函数是删除了的,这样保证了对象独占,如果不是独占,那么跟shared_ptr// 就是一样的功能了。// std::unique_ptr<Foo> pf1 = pf; // compile error// 按值...
std::cout << "local pointer in a thread:\n" << " lp.get() = " << lp.get() << ", lp.use_count() = " << lp.use_count() << '\n'; } } int main() { std::shared_ptr p = std::make_shared(); std::cout << "Created a shared Derived (as a pointer to Base)\n...
voidprocess(shared_ptr<int>ptr) { cout<<"in process use_count:"<<ptr.use_count()<<endl; } cout<<"don't mix shared_ptr and normal pointer:"<<endl; shared_ptr<int>p5(newint(1024)); process(p5); intv5=*p5; cout<<"v5: "<<v5<<endl; ...
Flag initialization of a naked pointer with the result of a new 提示使用new的结果初始化裸指针的情况。 Flag delete of local variable 标记销毁局部变量的情况。 原文链接: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c149-use-unique_ptr-or-shared_ptr-to-avoid-forge...
C++11中的智能指针分为共享型的shared_ptr和独占型的unique_ptr,C++11提供了make_shared函数来创建shared_ptr指针,使用起来更方便,有了make_shared...函数,就可以完全摆脱new操作了,可以写出完全没有new/delete的程序。...但是unique_ptr却不...