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Constructor Acquires, Destructor Releases Resource Acquisition Is Initialization

w https://zh.wikipedia.org/wiki/RAII RAII要求,资源的有效期与持有资源的对象的生命期严格绑定,即由对象的构造函数完成资源的分配(获取),同时由析构函数完成资源的释放.在这种要求下,只要对象能正确地析构,就不会出现资源泄露问题. https://en.wikipedia.org/wiki/Resource_acquisition_is_initialization Resource acquisition is initialization (RAII)[1…

Resource Acquisition Is Initialization(RAII Idiom)

原文链接:http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Resource_Acquisition_Is_Initialization Intent To guarantee release of resource(s) at the end of a scope To provide basic exception safety guarantee Also Known As Execute-Around Object Resource Rel…

RAII（Resource Acquisition Is Initialization）简介

RAII(Resource Acquisition Is Initialization),也称为“资源获取就是初始化”,是C++语言的一种管理资源.避免泄漏的惯用法.C++标准保证任何情况下,已构造的对象最终会销毁,即它的析构函数最终会被调用.简单的说,RAII 的做法是使用一个对象,在其构造时获取资源,在对象生命期控制对资源的访问使之始终保持有效,最后在对象析构的时候释放资源. 详见:http://developer.51cto.com/art/201106/267946.htm…

RAII(Resource Acquisition Is Initialization)资源获得式初始化

当在编写代码中用到异常,非常重要的一点是:“如果异常发生,程序占用的资源都被正确地清理了吗?” 大多数情况下不用担心,但是在构造函数里有一个特殊的问题:如果一个对象的构造函数在执行过程中抛出异常,那么这个对象的析构函数就不会被调用. 困难的事情是在构造函数中分配资源.如果在构造函数中发生异常,析构函数将没有机会释放这些资源. 这个问题经常伴随着”悬挂“指针出现. 例如: // Naked pointers. #include <iostream> #include <cstddef>…

__attribute__中constructor和destructor

1.前言 最近看到一份代码,看到一个函数前面用__attribute__((destructor))修饰,当时感觉有点怪怪的,搜了整个程序,也没发现哪个地方调用这个函数.于是从字面意思猜想,该函数会在程序结束后自动调用,与C++中的析构函数类似.第一次接触GNU下的attribute,总结一下. 2.__attribute__介绍 __attribute__可以设置函数属性(Function Attribute).变量属性(Variable Attribute)和类型属性(Type Attrib…

Constructor and destructor -- Initialization & Cleanup in C++

Why need initialization and cleanup? A large segment of C bugs occur when the programmer forgets to initialize or clean up a variable. The class designer can guarantee initialization of every object by providing a special function called the construc…

__attribute__中constructor和destructor[总结]

1.前言 最近看到一份代码,看到一个函数前面用__attribute__((destructor))修饰,当时感觉有点怪怪的,搜了整个程序,也没发现哪个地方调用这个函数.于是从字面意思猜想,该函数会在程序结束后自动调用,与C++中的析构函数类似.第一次接触GNU下的attribute,总结一下. 2.__attribute__介绍 __attribute__可以设置函数属性(Function Attribute).变量属性(Variable Attribute)和类型属性(Type Attrib…

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring-mybatis.xml]: Initialization of bean failed

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<Effective C++>读书摘要--Resource Management<一>

1.除了内存资源以外,Other common resources include file descriptors, mutex locks, fonts and brushes in graphical user interfaces (GUIs), database connections, and network sockets. Regardless of the resource, it's important that it be released when you're fini…

C++ Core Guidelines

C++ Core Guidelines September 9, 2015 Editors: Bjarne Stroustrup Herb Sutter This document is a very early draft. It is inkorrekt, incompleat, and pµøoorly formatted. Had it been an open source (code) project, this would have been release 0.6. Copy…