C++ 错误 C2440：“正在初始化”：无法从“初始化列表”转换
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error C2440: 'initializing' : cannot convert from 'initializer-list'
提问by Fatima Rashid
#include<iostream>
using namespace std;
struct TDate
{
int day, month, year;
void Readfromkb()
{
cout << "\n ENTER DAY MONTH YEAR\n";
cin >> day >> month >> year;
}
void print()
{
cout << day << month << year;
}
private:
int ID;
bool valid;
};
int main()
{
TDate t1, t2,t3={ 1, 2, 3 };
t1.Readfromkb();
t1.print();
cin.ignore();
cin.get();
return 0;
}
why i'm getting Error 1 error C2440: 'initializing' : cannot convert from 'initializer-list' to 'TDate' and 2 IntelliSense: too many initializer values. When I remove bool valid and int ID the programs works.Why is it so?
为什么我收到错误 1 错误 C2440：“正在初始化”：无法从“初始化列表”转换为“TDate”和 2 IntelliSense：初始化值太多。当我删除 bool valid 和 int ID 时，程序会工作。为什么会这样？
回答by Oblomov
You are getting the error because you are trying to initialize a TDatefrom an aggregate initialization list. This cannot be done when the type has private members (such as, in your case, IDand valid).
您收到错误是因为您试图TDate从聚合初始化列表中初始化 a 。当类型具有私有成员（例如，在您的情况下，ID和valid）时，这无法完成。
You can work around this by providing a constructor for your struct from three ints and using TDate t1, t2, t3(1, 2, 3).
您可以通过从三个ints为您的结构提供构造函数并使用TDate t1, t2, t3(1, 2, 3).
回答by vishal
To do t3={ 1, 2, 3 };you have to make constructor of TDate with takes three arguments, like this:
为此， t3={ 1, 2, 3 };您必须使用三个参数来制作 TDate 的构造函数，如下所示：
TDate(int i, int i1, int i2);
and implement it using:
并使用以下方法实现它：
TDate::TDate(int i, int i1, int i2) {
}
if you dont want to create constructor, then create object like this:
如果你不想创建构造函数，那么创建这样的对象：
TDate t1 = TDate();
