What is scope resolution operator?

Scope resolution operator, symbol ::, is an operator in C++ which specifies that the scope of the function is restricted to the particular class.
Use of scope resolution operator:
Return-type Class-name :: function-name (parameter list)
{
function body
}

Example:

float calc :: sum(float a, float b)
{
    float sum;
    sum = a + b;
    return sum;
}

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