Qt c++ 聚合“std::stringstream ss”的类型不完整，无法定义
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Qt c++ aggregate 'std::stringstream ss' has incomplete type and cannot be defined
提问by tyty5949
I have this function in my program that converts integers to strings:
我的程序中有这个函数可以将整数转换为字符串：
QString Stats_Manager::convertInt(int num)
{
stringstream ss;
ss << num;
return ss.str();
}
But when ever i run this i get the error:
但是当我运行这个时，我收到错误：
aggregate 'std::stringstream ss' has incomplete type and cannot be defined
Im not really sure what that means. But if you know how to fix it or need any more code please just comment. Thanks.
我不太确定这意味着什么。但是，如果您知道如何修复它或需要更多代码，请发表评论。谢谢。
回答by Luchian Grigore
You probably have a forward declaration of the class, but haven't included the header:
你可能有一个类的前向声明，但没有包含标题：
#include <sstream>
//...
QString Stats_Manager::convertInt(int num)
{
std::stringstream ss; // <-- also note namespace qualification
ss << num;
return ss.str();
}
回答by booiljoung
Like it's written up there, you forget to type #include <sstream>
就像写在那里一样，你忘记打字了 #include <sstream>
#include <sstream>
using namespace std;
QString Stats_Manager::convertInt(int num)
{
stringstream ss;
ss << num;
return ss.str();
}
You can also use some other ways to convert intto string, like
您还可以使用其他一些方式转换int为string，例如
char numstr[21]; // enough to hold all numbers up to 64-bits
sprintf(numstr, "%d", age);
result = name + numstr;
check this!
检查这个！
