在上面的例子中,我们分别创建了ULL和Complex的别名,这样可以在代码中使用更简短和易于理解的名称。 2. 别名为结构体和类: typedefstruct{intage;std::stringname;}Person;// 创建名为 Person 的别名以表示这个结构体classMyCustomClass{// ...};typedefMyCustomClassMCC;// 创建名为 MCC 的别名来表示 MyCustom...
WikiMatrix The use of typedef and union handles alignment (given that sbrk supplies an appropriate pointer). Literature In the previous example, the use of a typedef for the std::map helps improve readability. Literature *begin) return false; ++begin; } return true; } }; Note the publ...
std::cout << "int is " << std::is_integral<int>::value << '\n'; // 输出 true std::cout << "double is " << std::is_integral<double>::value << '\n'; //输出 false 1. 2. 3. 4. 5. std::is_floating_point std::is_floating_point 用于检查一个类型是否为浮点类型。 temp...
/* 声明结构体类型complex;将其重新声明为COMPLEX; */ typedefstructcomplex{ intreal; floatimag; } COMPLEX; /*声明一个没有名字的结构体类型,将其声明为COMPLEX类型; *typedef声明时,结构体类型可以省略原标识符,只保留struct标识符;*/ typedefstruct{ intreal; floatimag; } COMPLEX; 2.3.2...
Both of these forms enable the creation of variables of typecounter. Something more useful would be a type alias like this one forstd::ios_base::fmtflags: C++ // C++11usingfmtfl =std::ios_base::fmtflags;// C++03 equivalent:// typedef std::ios_base::fmtflags fmtfl;fmtfl fl_orig =st...
1 typedef std::map<string, int> ScoreByName; Now it's clear that this map is designed to store the scores associated with different individuals. Moreover, if you decided that you wanted scores to be floating point numbers, you'd have no trouble changing it from mapping scores as integers...
Similarly, C++11 provides the ability to create reference-counted pointers that can hold any pointer type without having to resort to usingvoid*. This provides a powerful and generic facility that can be customized by clients to create type-safe shared pointers to any object, such asstd::shared...
Both of these forms enable the creation of variables of typecounter. Something more useful would be a type alias like this one forstd::ios_base::fmtflags: C++ // C++11usingfmtfl =std::ios_base::fmtflags;// C++03 equivalent:// typedef std::ios_base::fmtflags fmtfl;fmtfl fl_orig =st...
Both of these forms enable the creation of variables of typecounter. Something more useful would be a type alias like this one forstd::ios_base::fmtflags: C++ // C++11usingfmtfl =std::ios_base::fmtflags;// C++03 equivalent:// typedef std::ios_base::fmtflags fmtfl;fmtfl fl_orig =st...
Both of these forms enable the creation of variables of typecounter. Something more useful would be a type alias like this one forstd::ios_base::fmtflags: C++ // C++11usingfmtfl =std::ios_base::fmtflags;// C++03 equivalent:// typedef std::ios_base::fmtflags fmtfl;fmtfl fl_orig =st...