Movatterモバイル変換


[0]ホーム

URL:


cppreference.com
Namespaces
Variants
    Actions

      std::make_signed

      From cppreference.com
      <cpp‎ |types
       
       
      Metaprogramming library
      Type traits
      Type categories
      (C++11)
      (C++11)(DR*)
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      (C++11) 
      Type properties
      (C++11)
      (C++11)
      (C++14)
      (C++11)(deprecated in C++26)
      (C++11)(until C++20*)
      (C++11)(deprecated in C++20)
      (C++11)
      Type trait constants
      Metafunctions
      (C++17)
      Supported operations
      Relationships and property queries
      Type modifications
      (C++11)(C++11)(C++11)
      make_signed
      (C++11)
      Type transformations
      (C++11)(deprecated in C++23)
      (C++11)(deprecated in C++23)
      (C++11)
      (C++11)(until C++20*)(C++17)

      Compile-time rational arithmetic
      Compile-time integer sequences
       
      Defined in header<type_traits>
      template<class T>
      struct make_signed;
      (since C++11)

      IfT is an integral (exceptbool) or enumeration type, provides the member typedeftype which is the signed integer type corresponding toT, with the same cv-qualifiers.

      IfT is signed or unsignedchar,short,int,long,longlong, the signed type from this list corresponding toT is provided.

      IfT is an enumeration type orchar,wchar_t,char8_t(since C++20),char16_t,char32_t, the signed integer type with the smallestrank having the samesizeof asT is provided.

      Otherwise, the behavior is undefined.

      (until C++20)

      Otherwise, the program is ill-formed.

      (since C++20)

      If the program adds specializations forstd::make_signed, the behavior is undefined.

      Contents

      [edit]Member types

      Name Definition
      type the signed integer type corresponding toT

      [edit]Helper types

      template<class T>
      using make_signed_t=typename make_signed<T>::type;
      (since C++14)

      [edit]Example

      Run this code
      #include <type_traits> enumstruct E:unsignedshort{}; int main(){using char_type= std::make_signed_t<unsignedchar>;using int_type= std::make_signed_t<unsignedint>;using long_type= std::make_signed_t<volatileunsignedlong>;using enum_type= std::make_signed_t<E>;     static_assert(std::is_same_v<char_type,signedchar> andstd::is_same_v<int_type,signedint> andstd::is_same_v<long_type,volatilesignedlong> andstd::is_same_v<enum_type,signedshort>);}

      [edit]See also

      (C++11)
      checks if a type is a signed arithmetic type
      (class template)[edit]
      checks if a type is an unsigned arithmetic type
      (class template)[edit]
      obtains the corresponding signed type for the given integral type
      (class template)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/types/make_signed&oldid=153278"

      [8]ページ先頭

      ©2009-2025 Movatter.jp