How to declare a wstring in a header file c++

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C++

Hi I am trying to use a wstring variable in various classes so I thought if I put it in a header file under public I would be able to use it.

I have got this ->

#ifndef _TWITTER_H_
#define _TWITTER_H_

class Twitter
{
public:
	void call();
	void run_internal();
	wstring newName;
};
#endif

But i get these errors ->

Error 20 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int engine\twitter.h 9 1 Engine

and

Error 19 error C2146: syntax error : missing ';' before identifier 'newName' \engine\twitter.h 9 1 Engine

I am quite confused as I don't know why.

Any help would be appreciated.

Mark