How to obtain a typedef for the unsigned version of a signed character type

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From: red floyd on 7 Mar 2010 12:07

---

On 3/7/2010 2:01 PM, JohnW wrote:
> I want to obtain a typedef for the unsigned version of a signed
> character type. The example below demonstrates the problem, I have a
> typedef for a signed character type but don't know how to obtain the
> corresponding unsigned type.
>
> template< class string_t>
> struct Example
> {
> typedef typename string_t::value_type char_t;
> typedef unsigned char_t uchar_t; // doesn't compile
>
> // ...
> };
>

template<typename T> struct to_unsigned;
template<>
struct to_unsigned<char>
{
typedef unsigned char unsigned_t;
};

template<>
struct to_unsigned<wchar_t>
{
typedef unsigned wchar_t unsigned_t;
};

template<>
struct to_unsigned<short>
{
typedef unsigned short unsigned_t;
};

template<>
struct to_unsigned<int>
{
typedef unsigned int unsigned_t;
}

template<>
struct to_unsigned<long>
{
typedef unsigned long unsigned_t;
};

struct Example
{
typedef typename string_t::value_type char_t;
typedef typename to_unsigned<char_t>::unsigned_t uchar_t;

// ...
};


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