[root@PC1 test]# gcc test.c-o kkk## 编译,出现警告test.c: In function ‘main’: test.c:7:9: warning: passing argument1of ‘print_array’fromincompatible pointer type [enabled bydefault] print_array(a);^test.c:2:6: note: expected ‘constint(*)[2]’ but argumentisof type ‘int(...
Explanation:In this example, a function named print_value is defined to take a const reference to an integer as its argument. Since the argument is declared as const, cannot modify within the function. The function simply prints the value of the argument to the console. In the main, an in...
传统的赋值操作： char *cp = "c"; const char *ccp; ccp = cp; printf("*ccp:%c",*ccp);...
输出: C:\Users\Windows\CLionProjects\Project1\main.cpp: In function 'int main()': C:\Users\Windows\CLionProjects\Project1\main.cpp:10:22: error: passing 'const Time' as 'this' argument discards qualifiers [-fpermissive] t1.set_time(2,2,2); ^ In file included from C:\Users\Windows\...
const_ref.cpp: In function `int main()': const_ref.cpp:14: error: invalid initialization of non-const reference of type ' int&' from a temporary of type 'int' const_ref.cpp:4: error: in passing argument 1 of `void f(int&)' 关于临时变量的内容,推荐博客: 临时变量不能作为非const类...
const成员函数, const member function 起源 上周在写talk的OnlineStatManager的时候(一个用于管理用户在线类型的类), 其中有个private member. private: OnlineType getStat(intuserId)const; 用来读出user的在线类型, 我把这个member声明为了const , 在读map的时候加读锁, 锁用到了自己定义的类成员 boost::...
Function arguments and return types Class Data members Class Member functions Objects 1) Constant Variables in C++ If you make any variable as constant, using const keyword, you cannot change its value. Also, the constant variables must be initialized while they are declared. ...
In my processing program, I added an object into a global ArrayList called items in my draw function. Here is the class. Here is my draw function. I tried printing the size of items in my mouseClicked... How to return an object that was deleted?
问如果constexpr()与元组一起使用，则为C++17EN从C++17开始，在编写C++代码时就可以在头文件中定义...
我知道如果你写void function_name(int& a),那么函数不会对传递的变量进行本地复制。我在文献中也遇到过应该写void function_name(const int & a)的情...Difference of function argument as (const int &) and (int & a) in C++