CODEWITHSUNDEEP
c++c++11types
Elijah Seed Arita
Elijah Seed Arita

Reputation: 799

Are char16_t and char32_t part of the std namespace?

I recently learned that using size_t as opposed to std::size_t in C++ is non-standard, and had to change my code because of it. I've read in some other answers that char16_t and char32_t are also introduced as typedefs, however intellisense only recognizes them without std::, and I don't know which header they come from, except the C header <uchar.h>, according to cppreference.com.

Should I prefix std:: for these types? And if so, which C++ header are they defined in?

Upvotes: 2

Views: 164

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 597860

In C++11 and later, char16_t and char32_t are built-in types of the C++ language itself, like char and wchar_t are. They are not part of the standard library, so no, they are not in the std:: namespace, or defined in any header file.

Upvotes: 2

Nicol Bolas
Nicol Bolas

Reputation: 474186

I've read in some other answers that char16_t and char32_t are also introduced as typedefs

Either these answers are wrong or you are misunderstanding what you read (or they were talking about C).

char16_t and char32_t are keywords in C++ (unlike size_t). They are fundamental types, just like int and float. They are types distinct from all other types, but they do have an underlying type (std::uint_least16_t and std::uint_least32_t respectively).

In C11, char16_t and char32_t are typedefs defined in the header <uchar.h>. Maybe the answer was talking about C.

Upvotes: 2

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