The Integer concept fails for char

[Joel Lathrop <jal6806@…>]

The Integer concept fails for char (e.g. BOOST_CONCEPT_ASSERT((Integer<char>)) results in a compiler error). However, Section 3.9.1 paragraph 7 of the C++ standard states, "Types bool, char, wchar_t, and the signed and unsigned integer types are collectively called integral types. A synonym for integral type is integer type." So while char is not a signed integer type nor is it an unsigned integer type (and therefore is rightly rejected by the SignedInteger and UnsignedInteger concepts), it is an integer type and should be accepted by the Integer concept.

This bug can be easily fixed by adding an instantiation for char to the Integer template in concept_check.hpp.

[Jeremiah Willcock]

(In [62612]) Added char as an integral type; fixes #2629