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Without these the return type could be wrong (e.g. supposed to return a reference but returns a value).
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
#ifndef LLARP_UTIL_MEMFN
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#define LLARP_UTIL_MEMFN
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#include <type_traits>
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#include <utility>
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#include <memory>
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namespace llarp
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{
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namespace util
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{
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// Wraps a member function and instance into a callable object that invokes
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// the method (non-const overload).
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template <
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typename Return, typename Class, typename Derived, typename... Arg,
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typename =
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std::enable_if_t< std::is_base_of< Class, Derived >::value > >
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auto
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memFn(Return (Class::*f)(Arg...), Derived* self)
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{
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return [f, self](Arg... args) -> Return {
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return (self->*f)(std::forward< Arg >(args)...);
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};
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}
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// Wraps a member function and instance into a lambda that invokes the
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// method (const overload).
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template <
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typename Return, typename Class, typename Derived, typename... Arg,
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typename =
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std::enable_if_t< std::is_base_of< Class, Derived >::value > >
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auto
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memFn(Return (Class::*f)(Arg...) const, const Derived* self)
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{
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return [f, self](Arg... args) -> Return {
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return (self->*f)(std::forward< Arg >(args)...);
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};
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}
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// Wraps a member function and shared pointer to an instance into a lambda
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// that invokes the method.
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template <
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typename Return, typename Class, typename Derived, typename... Arg,
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typename =
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std::enable_if_t< std::is_base_of< Class, Derived >::value > >
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auto
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memFn(Return (Class::*f)(Arg...), std::shared_ptr< Derived > self)
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{
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return [f, self = std::move(self)](Arg... args) -> Return {
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return (self.get()->*f)(std::forward< Arg >(args)...);
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};
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}
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// Wraps a member function and shared pointer to an instance into a lambda
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// that invokes the method (const method overload).
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template <
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typename Return, typename Class, typename Derived, typename... Arg,
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typename =
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std::enable_if_t< std::is_base_of< Class, Derived >::value > >
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auto
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memFn(Return (Class::*f)(Arg...) const, std::shared_ptr< Derived > self)
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{
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return [f, self = std::move(self)](Arg... args) -> Return {
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return (self.get()->*f)(std::forward< Arg >(args)...);
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};
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}
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} // namespace util
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} // namespace llarp
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#endif
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