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add input func check to octa::Function

master
Daniel Kolesa 2015-05-03 16:09:47 +01:00
parent 64f403011a
commit da69a57015
1 changed files with 43 additions and 16 deletions
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59
octa/functional.h
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@ -349,6 +349,46 @@ namespace octa {
typedef U second_argument_type;
};
template<typename, typename>
struct IsValidFunctor {
static constexpr bool value = false;
};
template<typename R, typename ...A>
struct IsValidFunctor<Function<R(A...)>, R(A...)> {
static constexpr bool value = false;
};
struct __OctaEmpty {
};
template<typename T>
T func_to_functor(T &&f) {
return forward<T>(f);
}
template<typename RR, typename T, typename ...AA>
auto func_to_functor(RR (T::*f)(AA...)) -> decltype(mem_fn(f)) {
return mem_fn(f);
}
template<typename RR, typename T, typename ...AA>
auto func_to_functor(RR (T::*f)(AA...) const) -> decltype(mem_fn(f)) {
return mem_fn(f);
}
template<typename T, typename R, typename ...A>
struct IsValidFunctor<T, R(A...)> {
template<typename U>
static decltype(func_to_functor(declval<U>())(declval<A>()...)) __octa_test(U *);
template<typename>
static __OctaEmpty __octa_test(...);
static constexpr bool value = IsConvertible<
decltype(__octa_test<T>(nullptr)), R
>::value;
};
template<typename R, typename ...A>
struct Function<R(A...)>: __OctaFunction<R, A...> {
Function( ) noexcept { initialize_empty(); }
@ -364,7 +404,9 @@ namespace octa {
}
template<typename T>
Function(T f) noexcept(__OctaFunctorInPlace<T>::value) {
Function(T f, EnableIf<IsValidFunctor<T, R(A...)>::value, __OctaEmpty>
= __OctaEmpty())
noexcept(__OctaFunctorInPlace<T>::value) {
if (func_is_null(f)) {
initialize_empty();
return;
@ -441,21 +483,6 @@ namespace octa {
static bool func_is_null(RR (T::* const &fptr)(AA...) const) {
return fptr == nullptr;
}
template<typename T>
T func_to_functor(T &&f) {
return forward<T>(f);
}
template<typename RR, typename T, typename ...AA>
auto func_to_functor(RR (T::*f)(AA...)) -> decltype(mem_fn(f)) {
return mem_fn(f);
}
template<typename RR, typename T, typename ...AA>
auto func_to_functor(RR (T::*f)(AA...) const) -> decltype(mem_fn(f)) {
return mem_fn(f);
}
};
template<typename T>