在c ++中，Netbeans IDE抛出“无法解析标识符字符串”

Question

I am getting a couple of errors that I am confused about

There is this function declaration that Netbeans IDE keeps throwing an error about

    string  GetValue(const std::string& key);

The error I am getting is-

Unable to resolve identifier String

What am I doing wrong here?

Answer 1

I assume you've remembered to include the header:

#include <string>

Then you can then use as indicated above

std::string GetValue(const std::string& key);

or

using namespace std;
string GetValue(const string& key);

Answer 2

#include <...> #include <...>

using namespace std;

...

string GetValue(const string& key);

...

That's all

Answer 3

The other answers are correct, but I would not recommend polluting your namespace by using using namespace std; instead, just rename all of the calls that use a string with std::string .

This is much more concise and helps with auto-completion.

Answer 4

Try this

std::string GetValue(const std::string& key);

Best if you added the namespace in the header file so you don't have to qualify the std namespace everywhere in your code.