urgent help with operator overloading

[ambr]

need to know how to write definition to overload relational operators as a non member functions in c++ for e.g
friend bool operator ==(const dataType&,const dataType&)
friend bool operator <=(const dataType&,const dataType&

these are prototypes how do iwrite the definitionsof these two.

[Banfa]

Well that all rather depends on what dataType is and what logic you are using when defining the comparison

for instance taking the structure

class myType
{
friend bool operator ==(const myType &op1, const myType &op2);


proctected:
    char *m_Data;
    int size;

public:
    myType();
    ~myType();
}

are 2 instances of myTye equal when m_Data point to the same location or are 2 instances of myType equal when the data pointed to by the 2 m_Data members is the same?

By the way I don't think those friend keywords are required in the declarations.

A comparison operator for this type could be

bool operator ==(const myType &op1, const myType &op2)
{
    if (op1.size != op2.size)
        return false;

    return (memcmp(op1.m_data, op2.m_data, op1.size) == 0);
}