Checking policies

Collaboration diagram for Checking policies:

Classes
struct	Loki::NoCheck< P >
struct	Loki::AssertCheck< P >
struct	Loki::AssertCheckStrict< P >
struct	Loki::RejectNullStatic< P >
struct	Loki::RejectNull< P >
struct	Loki::RejectNullStrict< P >