effective c#

C. Why does the destructor not declare itself as virtual, and why the implementation details must be in the definition of today's class? Not doing so will result in a loss of performance. Efficiency is very important. Why is C + + not able to detect initialization dependencies between non-local static objects? Because C + + support is compiled separately (that i

details:1) If The argument is either the unparenthesised name of an object/function,sion ( object.member or pointer-> or is a member access Expres member ), then the decltype specifies the declared type of the entity specified by this expression. 2) If The argument is any other expression of type T and thena) If the value category of expression is xvalueand then the decltype specifies T b) If the value category of expression is lvalueand then the decltype specifies T

racing Form (race conditions).Of course, using the reference-return function method prevents the initialization order problem, assuming that the object that needs to be initialized must first have a reasonable initialization order. If object A must be initialized in a system before object B is initialized, and object A's initialization depends on object B, there is a problem. If you can avoid this morbid scenario, the method described here can serve you well, at least in a single-threaded appli

Write high-quality iOS code--effective objective-c 2.0 Reading notesThis book was finished at the beginning of the year, feeling good, introduced a lot of small points, are not very concerned about the weekdays.The 1th chapter is familiar with Objective-cThis chapter is nothing to introduce.1th: Understand the origin of the Objective-c language 2nd: Minimize the

If the object you want to define for your class is unique, that is, the object cannot be copied, or assigned to another object using an assignment operation, the best way is to disable the copy constructor and the assignment operator. Several disabled methods are described below. (method from effective C + +, similar to if you want to disable other functions of the class) 1. Defined as private and does not

Brief introduction:Recently the company project close, you can have time to read the book. "52 Effective ways to write high-quality iOS and OS X code" this book explains many of the skills and specifications of iOS development, highly recommended!Here are the notes that you took when reading your book, as usual, first on the list:Directory:Chapter One: Familiarity with objective-cChapter II: Object, Message, RuntimeChapter III: interface and API desig

"Effective C + +" chapter Seventh: template and generic programming Learn about implicit interfaces and compile-time polymorphism. Object-oriented programming always uses an explicit declaration of an interface, and provides a special implementation in subclasses, thus realizing the run-time polymorphism. The interfaces in a template class are often implicit, implicitly meaning that when writing a templ

swap is to help class provide strong exception security. This technique is based on the assumption that the swap of the member version never throws an exception. This constraint only applies to the member version, not to the non-member version, because the default version of Swap is based on copying, while the general conditions are allowed to throw exceptions.Summarize:1) When Std::swap is not efficient for your type, provide a swap member function and make sure that the function does not thro

Have to say, effective C + + is really a C + + advanced Good book, just browse through the second time,It is now a summary of the general, and appropriate deployment, as a reference to the C + + review.(a). Make yourself accustomed to C + +___________________________________

replaced by virtual functions.Good C + + code should seldom be used for transformation, but it is impractical to be completely free of transformation. In the beginning it will int be double a reasonable use, although we can initially declare it as a double type to avoid transformation. As with many constructors, it is common to isolate transformations, hide transformations within functions, and interface to ensure that callers are unaffected by the t

the above example to illustrate the problem. b b (2); A a=b;//Call copy constructor a=b;//Call operator= The above two lines of code, the first one to instantiate an object B, the second line B to give a, then how to assign B to a, where the actual call is not operator=, but copy constructor, because the construction of an object must call constructor, or copy Constructor, then here must be called copy constructor,operator= is just an assignment action, an object has not yet been constructed ho

"Effective C + +""Original title" Effective C + +, third Edition"Former publishing house" Addison Wesley/pearson"Author" (US) Scott Meyers"Publishing House" electronic industry publishing house"More effective C + +""Original title

of a base class). The use of pass-by-reference can avoid this situation.c) When pass-by-reference, it is generally necessary to use the Const keyword to qualify parameters, that is, within the function can not be passed in the parameters to modify. Of course, if you need to return a result by reference, you don't have to use Const.d) Of course, although pass-by-reference is so useful, it's not always a good time to use this. When the parameter that we are passing is a built-in data type, it may

both, the Namevalue type is string not a built-in type, and the standard string has a copy constructor, so no2.namevalue initialization is the copy constructor that calls string and takes No1.namevalue as an argument.The other member type is the built-in type int, so no2.objectvalue is initialized with "copy every bits within No1.objectvalue".For the copy assignment operator, the following two conditions are met, consistent with the copy constructor.① generated code is legal② has the right oppo

Effective Modern C ++ translation-Clause 3: Understanding decltype Clause 3: Understand decltype Decltype is a very interesting monster. If a name or expression is provided, the decltype keyword will tell you the name or type of the expression. Generally, the results are consistent with your expectations. However, in some cases, the results produced by decltype lead you to seek answers in reference books or

square body (the width should always be the same as the height).However, the public inherits the proposition that everything can be done on the base class object, and everything may be implemented on derived class.and the most important point: ☆ Code by compiling does not mean that it can operate properly ☆ 3. Finally Is-a is not the only relationship that exists in class. Another two common relationships are has-a (with one) and is-implemented-in-terms-of (based on physical implementation). It

) = = (c*d) written for the comparison of rational objects ) {//The product is equal, dosomething ();} else//Product Unequal Time {dootherthing ();}The above expression (a*b) = = (C*d) always returns TRUE. Because the objects returned by operator* are static objects that are defined inside operator*. This object has only one, when the latter is computed, the former is overwritten. So there is always a compa

After reading effective C + + only feel the usual programming needs to pay attention to some of the problems, there is a certain harvest, but because there is no project practice,Do not have a deep understanding of the situation, but also the follow-up practice ~List 55 clauses:1. Consider C + + as a language federation.2. Replace # define with const, enum, inlin

exception SpecificationstemplateThis template defines an operator function operator== for all types. For any pair of objects of the same type, the function returns True if the object has the same address, otherwise false is returned.This template contains exception specifications that indicate that a template-generated function cannot throw an exception. However, this may not be the case because the opertor (address operator, see effective

, and if it is unfortunate for some efficiency reason, the compiler considers the order 1, 3, 2 to be, namely: Implementation new Widget ; Called priority() . Structure shared_ptr ; So if priority throws an exception, the new widget will never find it back." Although we use smart pointers everywhere, the resources are leaking! So in a more robust implementation, you should separate the statements that create the resource and initialize the smart pointer: shared_ptr widget > PW