This specialization of Switch for a value of 2 of the parameterized t_SWITCH_SELECTOR selects the parameterized t_T2 as Type.
Synopsis
Declared in <bslmf_switch.h>
template<
class t_T0,
class t_T1,
class t_T2,
class... t_TYPES>
struct Switch<2U, t_T0, t_T1, t_T2, t_TYPES...>;