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#### charT Requirements

Type `charT` used a template argument to class template `basic_regex`, must have a trivial default constructor, copy constructor, assignment operator, and destructor. In addition the following requirements must be met for objects; c of type `charT`, c1 and c2 of type `charT const`, and i of type `int`:

Expression | Return type | Assertion / Note / Pre- / Post-condition
--- | --- | ---
charT c | charT | Default constructor (must be trivial).
charT c(c1) | charT | Copy constructor (must be trivial).
c1 = c2 | charT | Assignment operator (must be trivial).
c1 == c2 | bool | true if c1 has the same value as c2.
c1 != c2 | bool | true if c1 and c2 are not equal.
c1 < c2 | bool | true if the value of c1 is less than c2.
c1 > c2 | bool | true if the value of c1 is greater than c2.
c1 <= c2 | bool | true if c1 is less than or equal to c2.
c1 >= c2 | bool | true if c1 is greater than or equal to c2.
intmax_t i = c1 | int | charT must be convertible to an integral type. Note: type charT is not required to support this operation, if the traits class used supports the full Boost-specific interface, rather than the minimal standardised-interface (see traits class requirements below).
charT c(i); | charT | charT must be constructable from an integral type.