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fix build

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This commit is contained in:
Nikolai Kochetov 2018-03-19 23:27:17 +03:00
parent 4d8f5f9c34
commit 51860191eb
1 changed files with 5 additions and 4 deletions
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9
dbms/src/Common/COWPtr.h
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@ -227,12 +227,13 @@ private:
Derived * derived() { return static_cast<Derived *>(this); }
const Derived * derived() const { return static_cast<const Derived *>(this); }
template<typename Class, typename... Args>
struct HasCreateImmutable<Args...> {
template<typename Class, typename Res, typename... Args>
struct HasCreateImmutable
{
private:
template<typename T>
static constexpr auto check(T *) -> typename std::is_same<
decltype( std::declval<T>().createImmutable( std::declval<Args>()... ) ), Ptr
decltype( std::declval<T>().createImmutable( std::declval<Args>()... ) ), Res
>::type;
template<typename>
@ -251,7 +252,7 @@ public:
template <typename... Args>
static auto create(Args &&... args)
{
if constexpr (HasCreateImmutable<Derived, args ...>)
if constexpr (HasCreateImmutable<Derived, Ptr, Args ...>::value)
return Derived::createImmutable(std::forward<Args>(args)...);
else
return MutablePtr(new Derived(std::forward<Args>(args)...));