Can anyone explain why does non-single parameter constructor marked as explicit compile? As far as I understand this is absolutely useless keyword here, so why does this compile without error?
class X
{
public:
explicit X(int a, int b) { /* ... */}
};
In C++03, and in this particular case, it makes no sense for a two parameter constructor to be marked explicit
. But it could make sense here:
explicit X(int i, int j=42);
So, marking a two parameter constructor with explicit
does not have to be an error.
In C++11, this use of explicit would prevent you from doing this:
X x = {1,2};
Not entirely true.
In C++11, constructors with multiple arguments can be implicitly converted using brace initialisation.
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