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49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
Overload
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20.14.0
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For C++17 and above
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Allows creation of a functor of overloaded lambdas
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etl::overload<typename... TOverloads>
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____________________________________________________________________________________________________
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Template deduction guide
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template <typename... TOverloads>
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overload(TOverloads...) -> overload<TOverloads...>;
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____________________________________________________________________________________________________
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Non-member functions
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template <typename... TOverloads>
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constexpr overload<TOverloads...> make_overload(TOverloads&&... overloads)
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Creates an etl::overload from a set of lambdas.
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____________________________________________________________________________________________________
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Example
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int result_int;
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double result_double;
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std::string result_string;
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auto overloaded = etl::make_overload([](int i) { result_int = i; },
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[](double d) { result_double = d; },
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[](const std::string& s) { result_string = s; });
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template <typename T, typename TOverload>
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void Function(T value, TOverload&& ol)
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{
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ol(value);
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}
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Function(int(1), overloaded); // result_int == 1
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Function(double(2.2), overloaded); // result_double == 2.2
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Function(std::string("3"), overloaded); // result_string == "3"
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____________________________________________________________________________________________________
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Alternative syntax
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Function(int(1), etl::overload
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{
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[](int i) { result_int = i; },
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[](double d) { result_double = d; },
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[](const std::string& s) { result_string = s; }
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});
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