Re: How to obtain a typedef for the unsigned version of a signed character type
On 7 Mrz., 23:01, JohnW <john.wilkinso...@yahoo.com> 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
// ...
};
You need a mapping for this.
Either you define one by your self,
e.g.
template<typename T>
struct make_unsigned;
template<>
struct make_unsigned<char> {
typedef unsigned char type;
};
....
or you use std::make_unsigned from
a library of a C++0x-compatible
compiler or use boost::make_signed
provided by the boost library
which does the same for you.
HTH & Greetings from Bremen,
Daniel Kr?gler
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