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C++ Language/Variables/DecomposingAuto
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The statement auto[iDesti,fDesti] = oSource; simultaneously defines two variables (iDesti and fDesti), initializing each of them to some corresponding value from the right-hand-side.
The right-hand-side could be a std::tuple<int,float> or it could be an object (whose first data member is a int, and second data member is a float).
Additional information about decomposing-auto (includes interactive examples)