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utility: simplify a bit tuple::apply

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Olivier Parcollet 2013-09-06 21:23:55 +02:00
parent e8bca45cd0
commit 1313566669
1 changed files with 8 additions and 11 deletions
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19
triqs/utility/tuple_tools.hpp
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@ -49,25 +49,22 @@ namespace triqs { namespace tuple {
* Returns : f(t[0], t[1], ...) * Returns : f(t[0], t[1], ...)
* Equivalent to f(*t) in python .... * Equivalent to f(*t) in python ....
*/ */
template<int pos, typename T> struct apply_impl { template<int pos> struct apply_impl {
template<typename F, typename ... Args> template<typename F, typename T, typename ... Args>
auto operator()(F && f, T const & t, Args && ... args) auto operator()(F && f, T const & t, Args && ... args)
DECL_AND_RETURN( apply_impl<pos-1,T>()(std::forward<F>(f),t, std::get<pos>(t), std::forward<Args>(args)...)); DECL_AND_RETURN( apply_impl<pos-1>()(std::forward<F>(f),t, std::get<pos>(t), std::forward<Args>(args)...));
}; };
template<typename T> struct apply_impl<-1,T> { template<> struct apply_impl<-1> {
template<typename F, typename ... Args> template<typename F, typename T, typename ... Args>
auto operator()(F && f, T const & t, Args && ... args) DECL_AND_RETURN( std::forward<F>(f)(std::forward<Args>(args)...)); auto operator()(F && f, T const & t, Args && ... args) DECL_AND_RETURN( std::forward<F>(f)(std::forward<Args>(args)...));
}; };
template<typename F, typename T> template<typename F, typename T>
auto apply (F && f, T const & t) DECL_AND_RETURN( apply_impl<std::tuple_size<T>::value-1,T>()(std::forward<F>(f),t)); auto apply (F && f, T const & t) DECL_AND_RETURN( apply_impl<std::tuple_size<T>::value-1>()(std::forward<F>(f),t));
//template <typename T, typename ClassType, typename ReturnType, typename... Args> //template <typename T, typename ReturnType, typename... Args>
//ReturnType apply(ReturnType(ClassType::*f)(Args...) const, T const & t) { return apply([f](Args const & ... args) { return (*f)(args...);} ,t);} //ReturnType apply( ReturnType(*f)(Args...), T const & t) { return apply([f](Args const & ... args) { return (*f)(args...);} ,t);}
template <typename T, typename ReturnType, typename... Args>
ReturnType apply( ReturnType(*f)(Args...), T const & t) { return apply([f](Args const & ... args) { return (*f)(args...);} ,t);}
/** /**
* apply_construct<F>(t) * apply_construct<F>(t)