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c++pointersunsignedshortwchar

LPWSTR, wchar_t* and unsigned short pointer in C++

I'm trying to understand if these types are all the same. I have this function from windows.h: GetCommandLine(), in UNICODE mode, and it returns a LPWSTR. Now, if I dig deeper I can see how LPWSTR is wchar_t* and if I go even further, I find out that wchar_t is unsigned short (16 bytes) or unsigned long (32 bytes). Yet, if I do this:

unsigned short* SysComm = GetCommandLine();

I get this error:

cannot convert from 'LPWSTR {aka wchar_t*} to 'short unsigned int*' in initialization

So, does the compiler follow the same logic to find out that LPWSTR is unsigned short* in the end or am I wrong?

Solution

  • wchar_t is a distinct type that is defined to have the same properties as one of the other integer types.

    Type wchar_t is a distinct type [...]. Type wchar_t shall have the same size, signedness, and alignment requirements (3.11) as one of the other integral types, called its underlying type.

    So you can't implicitly convert from a wchar_t* to a short* just as much as from an int* to a short*.