error: ‘S’ does not name a type error: ‘S’ does not name a type error: ‘Real’ does not name a type error: ‘Real’ does not name a type error: ‘Real’ does not name a type error: ‘Real’ does not name a type error: ‘Real’ does not name a type error: ‘constants...
template<classT>classA{public:typedefT* pointer; };template<classT>classB:publicA<T> {public: pointer b; }; 当定义一个B对象时,上述代码在g++中会报错:pointer does not name a type。 查阅资料后了解到: N4567 § 14.6.2[temp.dep]p3 In the definition of a class or class template, the...
在这两种情况下，`LengthType`都是`int`的别名。不同点 语法：`using`的语法通常被认为更清晰和易读...
Atypedef-name does not introduce a new type the way aclassdeclaration (9.1) orenumdeclaration does.Example: after 1 typedefintMILES ,*KLICKSP; the constructions 1 2 MILES distance; externKLICKSP metricp; are all correct declarations; the type of distance is int that ofmetricpis"pointer toint...
说个真事，同事n年c++开发经验，c++特别溜。有一次我拿typedef和#define反过来覆过去问他，一分钟不到他...
A typedef declaration does not reserve storage. The names you define using typedef are not new data types, but synonyms for the data types or combinations of data types they represent. The name space for a typedef name is the same as other identifiers. When an object is defined using a ...
typedef enum {/* using typedef */ FALSE = 0, TRUE = 1 } bool; enum bool {/* preferred alternative */ FALSE = 0, TRUE = 1 }; This syntax is preferred because one does not have to go to the end of a declaration to learn the name of the new type....
A typedef declaration does not reserve storage. The names you define using typedef are not new data types, but synonyms for the data types or combinations of data types they represent. The namespace for a typedef name is the same as other identifiers. The exception to this rule is if ...
/opt/ros/kinetic/include/moveit/macros/declare_ptr.h:53:16: error: ‘shared_ptr’ in namespace ‘std’ does not name a template type typedef std::shared_ptr<const Type> Name##ConstPtr; 用G++编译项目的时候发生标题上的错误,原因是,这是c++ 11标准的。在给g++传递命令行的时候加上-std=c++...
在C++编程语言中,typedef是一种用于为现有类型创建别名的关键字。它可以用于简化复杂的类型声明,提高代码的可读性和可维护性。然而,如果在使用typedef时出现无效使用,可能会导致编译错误或意外...