C++ stringstream 未在此范围内声明
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stringstream was not declared in this scope
提问by angela
I'm having problem with stringstream.my visual studio nor linux g++ can understand stingstream. I've added sstream but it does'nt solve anything. I've worked with it before and really don't know what's up with it now?
我在使用 stringstream 时遇到问题。我的 Visual Studio 和 linux g++ 都无法理解 stingstream。我添加了 sstream 但它没有解决任何问题。我以前用过它，现在真的不知道它是怎么回事？
#include <sstream>
#include <stdlib.h>
#include "SymbolTable.cpp"
#include "setjmp.h"
using namespace std;
jmp_buf *bfj;
int TOP , SP=3 ;
struct types{int int_val;float float_val;char char_val;bool bool_val;};
types DS[6400];
int main(){
...//some code here
label38 : stringstream s;
label39 : bfj = (jmp_buf *)"label65";
label40 : longjmp(*bfj,1);;
label41 : goto label43;
label42 : TOP=SP;
//some code here
}
I'm writing a compiler so the code is the output,that's why it may seams a bit odd.
我正在编写一个编译器，所以代码是输出，这就是为什么它可能接缝有点奇怪。
回答by Amardeep AC9MF
If you include #include <sstream>then you must also reference the class by:
如果包含，#include <sstream>则还必须通过以下方式引用该类：
std::stringstreamor declare using namespace std;before using it.
std::stringstream或using namespace std;在使用前声明。
If you post more information we could provide more detailed help.
如果您发布更多信息，我们可以提供更详细的帮助。
回答by jalf
This code compiles fine for me under G++:
这段代码在 G++ 下对我来说编译得很好：
#include <sstream>
#include <stdlib.h>
#include "setjmp.h"
using namespace std;
jmp_buf *bfj;
int TOP , SP=3 ;
struct types{int int_val;float float_val;char char_val;bool bool_val;};
types DS[6400];
int main(){
label38 : stringstream s;
label39 : bfj = (jmp_buf *)"label65";
label40 : longjmp(*bfj,1);;
label41 : goto label43;
label42 : TOP=SP;
label43 : (void)0;
//some code here
}
The only difference is that I removed #include "SymbolTable.cpp", and added a label43.
唯一的区别是我删除了#include "SymbolTable.cpp"，并添加了一个label43.
So apparently, if it doesn't work for you, the problem is in some of the code you omitted. The //some code hereparts or in SymbolTable.cpp
显然，如果它对您不起作用，则问题出在您省略的某些代码中。该//some code here零件或SymbolTable.cpp
Of course, it also seems verysuspicious that you're including a cpp file. That is most likely an error.
当然，您包含一个 cpp 文件似乎也很可疑。这很可能是一个错误。
