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refs #628 Use expression SFINAE and the void_t trick to simplify some type traits.

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This commit is contained in:
Mathew Sutcliffe
2016-03-25 19:01:07 +00:00
parent f159bdb5bf
commit 7ce1b268df
8 changed files with 117 additions and 85 deletions
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18
src/blackmisc/logcategorylist.h
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@@ -16,6 +16,7 @@
#include "logcategory.h"
#include "sequence.h"
#include "collection.h"
#include "typetraits.h"
#include <QObject>
#include <QThreadStorage>
#include <type_traits>
@@ -23,21 +24,6 @@
namespace BlackMisc
{
namespace Private
{
//! \private Trait to detect whether a class T has a member function called getLogCategories
template <class T> class HasGetLogCategories
{
struct Base { int getLogCategories; };
struct Derived : T, Base {};
template <typename U, U> struct TypeCheck {};
template <typename U> static std::false_type test(TypeCheck<decltype(&Base::getLogCategories), &U::getLogCategories> *);
template <typename U> static std::true_type test(...);
public:
using type = decltype(test<Derived>(nullptr));
};
}
/*!
* A sequence of log categories.
*/
@@ -117,7 +103,7 @@ namespace BlackMisc
static QThreadStorage<CLogCategoryList> list;
if (! list.hasLocalData())
{
list.localData().appendCategoriesFromMemberFunction(tag<T>(), typename Private::HasGetLogCategories<T>::type());
list.localData().appendCategoriesFromMemberFunction(tag<T>(), HasGetLogCategories<T>());
list.localData().appendCategoriesFromMetaType(tag<T>(), std::integral_constant<bool, QMetaTypeId<T>::Defined>());
list.localData().appendCategoriesFromMetaObject(tag<T>(), std::is_base_of<QObject, T>());
if (list.localData().isEmpty()) { list.localData().push_back(CLogCategory::uncategorized()); }