char_traits

char_traits

struct char_traits<E> {
    typedef E char_type;
    typedef T1 int_type;
    typedef T2 pos_type;
    typedef T3 off_type;
    typedef T4 state_type;
    static void assign(E& x, const E& y);
    static E *assign(E *x, size_t n, const E& y);
    static bool eq(const E& x, const E& y);
    static bool lt(const E& x, const E& y);
    static int compare(const E *x, const E *y, size_t n);
    static size_t length(const E *x);
    static E *copy(E *x, const E *y, size_t n);
    static E *move(E *x, const E *y, size_t n);
    static const E *find(const E *x, size_t n, const E& y);
    static E to_char_type(const int_type& ch);
    static int_type to_int_type(const E& c);
    static bool eq_int_type(const int_type& ch1, const int_type& ch2);
    static int_type eof();
    static int_type not_eof(const int_type& ch);
    };

The template class describes various character traits for type E. The template class basic_string as well as several iostreams template classes, including basic_ios, use this information to manipulate elements of type E. Such an element type must not require explicit construction or destruction. A bitwise copy has the same effect as an assignment.