CODEWITHSUNDEEP
c++
Girija Ram
Girija Ram

Reputation: 61

Is wstring::npos equal to -1 in cpp definitions?

int FDString::
ReverseFind(const FDString& searchString, int rend) const
 { 
return static_cast(mString.rfind(searchString.mString), rend == nPos ? String::npos : rend);
 }

Here i have defined

ifdef UNICODE
#define String std::wstring
#else
#define String std::string
#endif

I am sure std::string::npos is defined in cpp reference as -1 but in wstring i am not sure if its explicitly defined as -1? so can i assume std::wstring::npos is also -1?

Upvotes: 2

Views: 2050

Answers (2)

Axalo
Axalo

Reputation: 2953

npos is defined in std::basic_string which is the base class of std::string and std::wstring.
So it is the same in both classes.

Upvotes: 1

ANjaNA
ANjaNA

Reputation: 1426

Yes, you can.

wstring is a typedef to basic_string

typedef basic_string<wchar_t> wstring;

On the other hand, string is also typedef to basic_string

typedef basic_string<char> string;

nops is defined in basic_string, so is should be same in both types.

and it is defined as,

static const size_type npos = -1;

refer

Upvotes: 3

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