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The below code explanation says that this structure inherits from several lambdas, can be constructed from those lambdas, and folds over the using expression.

template<typename... Lambdas>
struct overloaded : public Lambdas...
{
    explicit overloaded(Lambdas... lambdas) : Lambdas(lambdas)... {}

    using Lambdas::operator()...;
};

My doubt is that parentheses i.e () indicate a c++17 fold expression but I don't see any enclosing parentheses around the using statement. How will it fold?

回答

using L::operator();