Determine if a Type is a Character

is_char is a metafunction that detects if a given type is a character.

#include <boost/spirit/home/support/string_traits.hpp>

	Note
	This header file does not need to be included directly by any user program as it is normally included by other Spirit header files relying on its content.

Name
`boost::spirit::traits`

template <typename T>
struct is_char
{
    <unspecified>;
};

Parameter	Description	Default
`T`	The type to detect.	none

Notation

Expression	Semantics
`is_char<T>::type`	`mpl::true_` if T should be treated as a character type, and `mpl::false_` otherwise. Generally, any implementation of `is_char` needs to behave as if if was a MPL Boolean Constant.

This customization point needs to be implemented for any strings that use a type other than char or `wchar_t to store character data.

If this customization point is implemented, the following other customization points need to be implemented as well.

Name	When to implement
`traits::is_string`	Whenever `is_char` is implemented.
`traits::char_type_of`	Whenever `is_char` is implemented.