A C++ template library for embedded applications
Embedded Template Library
MIT licensed
Designed and
maintained by
John Wellbelove
Overload
20.14.0
For C++17 and above
Allows creation of a functor of overloaded lambdas
etl::overload<typename... TOverloads>
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Template deduction guide
template <typename... TOverloads>
overload(TOverloads...) -> overload<TOverloads...>;
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Non-member functions
template <typename... TOverloads>
constexpr overload<TOverloads...> make_overload(TOverloads&&... overloads)
Creates an etl::overload from a set of lambdas.
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Example
int result_int;
double result_double;
std::string result_string;
auto overloaded = etl::make_overload([](int i) { result_int = i; },
[](double d) { result_double = d; },
[](const std::string& s) { result_string = s; });
template <typename T, typename TOverload>
void Function(T value, TOverload&& ol)
{
ol(value);
}
Function(int(1), overloaded); // result_int == 1
Function(double(2.2), overloaded); // result_double == 2.2
Function(std::string("3"), overloaded); // result_string == "3"
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Alternative syntax
Function(int(1), etl::overload
{
[](int i) { result_int = i; },
[](double d) { result_double = d; },
[](const std::string& s) { result_string = s; }
});
overload.h
