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Utils::transform with using keyword

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Change-Id: I98274bbd78a629854dd1774698158d9bdadc4096
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
This commit is contained in:
Nikita Baryshnikov
2016-06-01 10:00:00 +03:00
parent 25120b2f59
commit 2fbf126e4e
1 changed files with 13 additions and 23 deletions
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34
src/libs/utils/algorithm.h
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@@ -211,6 +211,9 @@ inserter(QSet<X> &container)
template<typename T> template<typename T>
using decay_t = typename std::decay<T>::type; using decay_t = typename std::decay<T>::type;
template<typename T>
using result_of_t = typename std::result_of<T>::type;
// abstraction to treat Container<T> and QStringList similarly // abstraction to treat Container<T> and QStringList similarly
template<typename T> template<typename T>
struct ContainerType struct ContainerType
@@ -220,26 +223,13 @@ struct ContainerType
// specialization for qt container T_Container<T_Type> // specialization for qt container T_Container<T_Type>
template<template<typename> class T_Container, typename T_Type> template<template<typename> class T_Container, typename T_Type>
struct ContainerType<T_Container<T_Type>> { struct ContainerType<T_Container<T_Type>>
typedef T_Type ElementType;
template<class NewElementType>
struct WithElementType
{ {
typedef T_Container<NewElementType> type;
};
template<class F, template<typename> class C = T_Container> template<class F, template<typename> class C = T_Container>
struct ResultOfTransform using ResultOfTransform = C<decay_t<result_of_t<F (T_Type)>>>;
{
typedef C<decay_t<typename std::result_of<F (ElementType)>::type>> type;
};
template<class R> template<class R>
struct ResultOfTransformPMF using ResultOfTransformPMF = T_Container<decay_t<R>>;
{
typedef typename WithElementType<decay_t<R>>::type type;
};
}; };
// specialization for QStringList // specialization for QStringList
@@ -280,10 +270,10 @@ template<typename C, // container
typename F> typename F>
Q_REQUIRED_RESULT Q_REQUIRED_RESULT
auto transform(const C &container, F function) auto transform(const C &container, F function)
-> typename ContainerType<C>::template ResultOfTransform<F>::type -> typename ContainerType<C>::template ResultOfTransform<F>
{ {
return TransformImpl< return TransformImpl<
typename ContainerType<C>::template ResultOfTransform<F>::type, typename ContainerType<C>::template ResultOfTransform<F>,
C C
>::call(container, function); >::call(container, function);
} }
@@ -294,10 +284,10 @@ template<typename C,
typename S> typename S>
Q_REQUIRED_RESULT Q_REQUIRED_RESULT
auto transform(const C &container, R (S::*p)() const) auto transform(const C &container, R (S::*p)() const)
->typename ContainerType<C>::template ResultOfTransformPMF<R>::type ->typename ContainerType<C>::template ResultOfTransformPMF<R>
{ {
return TransformImpl< return TransformImpl<
typename ContainerType<C>::template ResultOfTransformPMF<R>::type, typename ContainerType<C>::template ResultOfTransformPMF<R>,
C C
>::call(container, p); >::call(container, p);
} }
@@ -308,10 +298,10 @@ template<template<typename> class C, // result container type
typename F> // function type typename F> // function type
Q_REQUIRED_RESULT Q_REQUIRED_RESULT
auto transform(const SC &container, F function) auto transform(const SC &container, F function)
-> typename ContainerType<SC>::template ResultOfTransform<F, C>::type -> typename ContainerType<SC>::template ResultOfTransform<F, C>
{ {
return TransformImpl< return TransformImpl<
typename ContainerType<SC>::template ResultOfTransform<F, C>::type, typename ContainerType<SC>::template ResultOfTransform<F, C>,
SC SC
>::call(container, function); >::call(container, function);
} }