[Ns-developers] Ipv4Address and Ipv4Mask, getting rid of "implicit" constructors

[Gustavo Carneiro]

Right now you can pass "1.2.3.4"  to a function expecting Ipv4Address or
Ipv4Mask, and since the constructors do not have an 'explicit' keyword C++
will call the constructor automatically for us.  This "feature" is used in
ns-3 src/routing/global-routing-manager, and extensively in examples.
However I always find it confusing, and it can accidentally disable some
useful type checking normally done by C++.

I would like to make all these constructors "explicit", thus you have to
type Ipv4Address ("1.2.3.4") instead of "1.2.3.4".

Comments?

-- 
Gustavo J. A. M. Carneiro
INESC Porto, Telecommunications and Multimedia Unit
"The universe is always one step beyond logic." -- Frank Herbert