小编use*_*120的帖子

我正在尝试学习C++,我不明白为什么以下代码不起作用:

class String
{
public:
    String();
    String(const String& other);
    String& operator = (const String& other);
    String& operator = (const wchar_t* other);
    String& operator () (const wchar_t* other);
    ~String();
    operator const wchar_t* ();
            ...

在主要功能的某处:

wchar_t* x = L"A test string";
String y = (String)x; //not working
String z = x;  //not working

VC++编译器告诉我这个:

Error   1   error C2440: 'type cast': cannot convert from 'wchar_t *' to 'String'   
Error   2   error C2440: 'initializing': cannot convert from 'wchar_t *' to 'String'    
IntelliSense: no …