Hashtable.h will not compile with flag "-std=c++14" due to lack of class template argument deduction

[mrkita]

Tried this with the latest 3.27.00 version on GCC 11.4.0.

If C++14 is enforced with "-std=c++14" then eastl will not compile with the following errors:

In file included from eastl/source/hashtable.cpp:6:
EASTL/internal/hashtable.h: In member function ‘eastl::hashtable<Key, Value, Allocator, ExtractKey, Equal, H1, H2, H, RehashPolicy, bCacheHashCode, bMutableIterators, bUniqueKeys>::node_type* eastl::hashtable<Key, Value, Allocator, ExtractKey, Equal, H1, H2, H, RehashPolicy, bCacheHashCode, bMutableIterators, bUniqueKeys>::DoAllocateNodeFromKey(const key_type&)’:
EASTL/internal/hashtable.h:1759:163: error: missing template arguments before ‘{’ token
1759 | detail::allocator_construct(mAllocator, eastl::addressof(pNode->mValue), piecewise_construct, eastl::make_tuple(key), eastl::tuple{});
| ^
EASTL/internal/hashtable.h: In member function ‘eastl::hashtable<Key, Value, Allocator, ExtractKey, Equal, H1, H2, H, RehashPolicy, bCacheHashCode, bMutableIterators, bUniqueKeys>::node_type* eastl::hashtable<Key, Value, Allocator, ExtractKey, Equal, H1, H2, H, RehashPolicy, bCacheHashCode, bMutableIterators, bUniqueKeys>::DoAllocateNodeFromKey(eastl::hashtable<Key, Value, Allocator, ExtractKey, Equal, H1, H2, H, RehashPolicy, bCacheHashCode, bMutableIterators, bUniqueKeys>::key_type&&)’:
EASTL/internal/hashtable.h:1785:182: error: missing template arguments before ‘{’ token
1785 | detail::allocator_construct(mAllocator, eastl::addressof(pNode->mValue), piecewise_construct, eastl::forward_as_tuple(eastl::move(key)), eastl::tuple{});

This is due to the lack of CTAD, so the empty tuple must be declared fully with:

eastl::tuple<>{} in order to compile.

I have confirmed this on godbolt here: https://godbolt.org/z/TeGT55PG9

[mrkita]

Fixed here:
#586