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…

条款6 当推断意外类型时使用显式的类型初始化语句 基础知识 当使用std::vector<bool>的时候,类型推断会出现问题: std::vector<bool> features(const Widget& w); // OK ]; processWidget(w, highPriority); // ERROR auto highPriority = features(w)[]; processWidget(w, highPriority); // undefined…

参考:https://en.wikipedia.org/wiki/Initialization-on-demand_holder_idiom idiom - 一个线程安全的.无需synchronization的.且比无竞争的同步高效的单例模式 public class Something { private Something() {} private static class LazyHolder { private static final Something INSTANCE = new…

//############################################################################ /* Named Parameter Idiom */ /* 主要解决的问题 C++函数只支持位置参数,不支持像Python那样的命名参数 */ class OpenFile { public: OpenFile(string filename, bool readonly=true, bool appendWhenWriting=fals…

Idiom: a Lot on my Plate Share Tweet Share Tagged With: Idioms I’ve got a lot on my plate.  Americans love idioms: this is just another way to say “I’m really busy!”  Learn how to pronounce this idiom and start using it in conversation. I know I use…

How to Pronounce the Idiom: ‘Out Like a Light’ Share Tweet Share Tagged With: Idioms English is full of idioms.  Learn how to use and pronounce ‘Out like a Light’ comfortably in conversational English:  what words or syllables to reduce, how to link…

pimpl idiom flyfish 2014-9-30 pimpl是Pointer to implementation的缩写 为什么要使用pimpl 1最小化编译依赖 2接口与实现分离 3可移植 pimpl idiom也被称作Cheshire Cat , Compiler Firewall idiom.,d-pointer 这个技术在设计模式中作为桥接模式(Bridge pattern.)来描写叙述 看MSDN的演示样例 Pimpl header // my_class.h class my…

在读<Effective C++>和项目源代码时,看到pImpl Idiom.它可以用来降低文件间的编译依赖关系,通过把一个Class分成两个Class,一个只提供接口,另一个负责实现该接口,实现接口与实现的分离.这个分离的关键在于“以声明的依赖性”替换“定义的依赖性”,而编译依赖性最小化的本质是:让头文件尽可能的自我满足,万一做不到,则让它与其他文件内的声明式(而非定义式)相依. 引用这里的一些描述:The Pimpl idiom, also known as the compilation…

有些时候我们需要upcast为多种类型,这种情况下除了可以使用multiply inherits还可以inner class. 以下为例子: //: C10:InnerClassIdiom.cpp // Example of the "inner class" idiom. #include <iostream> #include <string> using namespace std; class Poingable { public: ; }; void…

This answer is from https://stackoverflow.com/a/3279550/10133369 Overview Why do we need the copy-and-swap idiom? Any class that manages a resource (a wrapper, like a smart pointer) needs to implement The Big Three. While the goals and implementation…