The best replacement for operator overloading is operator overriding.

The best alternatives to operator overloading are rated as following:
★★★★★  operator overriding
★★★★  function overloading
★★★  method overloading

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Speaking about operator overloading, one probably shouldn't forget about friend function in c++.

Other search terms related to operator overloading and their ratings are:
★★★★★ friend function in c++
★★★★ friend function
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operator overloading
operator overriding
function overloading