聚合“std::stringstream out”的类型不完整，无法定义 [C++]
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aggregate 'std::stringstream out' has incomplete type and cannot be defined [C++]
提问by Technupe
I am new to c++ please help me figure out what is wrong with this
我是 C++ 新手，请帮我弄清楚这有什么问题
string c;
stringstream out; //aggregate 'std::stringstream out' has incomplete type and cannot be //defined
out << it->second;
out << end1;//'end1' was not declared in this scope
c = out.str();
采纳答案by nathan
You seem to be missing an include for stringstream. On top of that you have a typo
您似乎缺少 stringstream 的包含。最重要的是你有一个错字
out << end1;
should read
应该读
out << endl;
linstead of 1.
l而不是1.
回答by Alnitak
Did you:
你是否：
#include <sstream>
Also, the second to last line should be endl(nb: lower-case L) not end1(number one).
此外，倒数第二行应该是endl（nb：小写 L）而不是end1（第一）。
The code below compiles and works correctly with G++ 4.2.1 on MacOS X
下面的代码在 MacOS X 上使用 G++ 4.2.1 编译并正常工作
#include <iostream>
#include <sstream>
int main() {
std::stringstream out;
out << "foo" << std::endl;
std::string c = out.str();
std::cout << c;
}
Omitting the #include <sstream>causes exactly the same error on my system as your first error.
忽略#include <sstream>导致我系统上的错误与您的第一个错误完全相同的原因。
回答by karlphillip
It's an lowercase Land not 1:
这是一个小写L而不是1：
out << endl;
I think @Bo is right, (sorry and thanks) change it to std::stringstream out;
我认为@Bo 是对的，（抱歉和感谢）将其更改为 std::stringstream out;
