Instantiates a specialized lexer for the given input type.
The default error handler just asserts 0.
If the type of the allocator is specified as template parameter, but no instance of it
is passed as runtime parameter, then the static method instance of the allocator type is
used.
Instantiates a specialized lexer for the given input type.
The default error handler just asserts 0. If the type of the allocator is specified as template parameter, but no instance of it is passed as runtime parameter, then the static method instance of the allocator type is used.