Question

I have the following class declaration:

class DepthDescriptor
{
public:
    DepthDescriptor(DepthType depth);
    bool operator==(DepthDescriptor& type);
    bool operator>=(DepthDescriptor& type);
    bool operator<=(DepthDescriptor& type);
...
}

Why does the following line not perform an implicit conversion to the DepthDescriptor object so that the operator comparison can take place?

if (depth == Depth_8U)
{
...
}

Note that depth is a DepthDescriptor object, DepthType is an enum, and Depth_8U is one of the enum values. I was hoping that lines like the one above would first call the implicit constructor DepthDescriptor(DepthType depth) and then the appropriate operator, but I’m getting no operator "==" matches these operands.

Answer 1

Try

bool operator==(const DepthDescriptor& type) const;
bool operator>=(const DepthDescriptor& type) const;
bool operator<=(const DepthDescriptor& type) const;