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type-traits(#985): better solution to detect string-like types

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we need this to branch into lexical conversion, which
should always take precedence over a string conversion.

The existing solution overlooked both the conversion paths
for char*, as well as the fact that chars and c-strings
can be handled directly (pass-through) by lexical conversion
This commit is contained in:
Fischlurch 2016-01-06 01:48:34 +01:00
parent 5be35a407f
commit e443fd79fd
1 changed files with 16 additions and 7 deletions
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23
research/try.cpp
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@ -112,21 +112,30 @@ stringz (P<X> ptr)
namespace {
using lib::meta::Strip;
using std::__or_;
using std::__and_;
using std::is_convertible;
using std::is_arithmetic;
using std::is_same;
using std::__not_;
using std::__and_;
using std::__or_;
template<typename T, typename U>
struct is_basically
: std::is_same <typename Strip<T>::TypeReferred
,typename Strip<U>::TypeReferred>
: is_same <typename Strip<T>::TypeReferred
,typename Strip<U>::TypeReferred>
{ };
template<typename X>
struct is_StringLike
: __or_< is_basically<X, string>
, is_convertible<X, const char*>
>
{ };
template<typename X>
struct can_lexical2string
: __or_< std::is_arithmetic<X>
, is_basically<X, string>
, is_basically<typename std::remove_all_extents<X>::type, char>
: __or_< is_arithmetic<X>
, is_StringLike<X>
>
{ };
}