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Ensure AutoInit can only be used with std::shared_ptr (#266)

This commit is contained in:
Daniel Mensinger 2019-10-02 19:47:51 +02:00 committed by An Tao
parent ffb8a9d0e4
commit daf72d3059
1 changed files with 12 additions and 10 deletions
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22
lib/inc/drogon/IOThreadStorage.h
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@ -57,31 +57,33 @@ namespace drogon
* @endcode
*/
template <class C,
bool ConstructorInitialize = true,
bool AutoInit = true,
template <class> class StoragePtrType = std::shared_ptr>
class IOThreadStorage
{
private:
using IsSharedPtr = std::is_same<StoragePtrType<C>, std::shared_ptr<C>>;
static_assert(!AutoInit || (AutoInit && IsSharedPtr::value),
"Default initialization only works with std::shared_ptr");
public:
static const bool isConstructorInitialized = ConstructorInitialize;
static const bool isConstructorInitialized = AutoInit;
using StoragePtr = StoragePtrType<C>;
using CreatorCallback = std::function<StoragePtr(size_t idx)>;
template <typename U = C,
typename = typename std::enable_if<
std::is_default_constructible<U>::value &&
std::is_same<StoragePtrType<U>, std::shared_ptr<U>>::value &&
ConstructorInitialize>::type>
IsSharedPtr::value && AutoInit>::type>
IOThreadStorage()
: IOThreadStorage([](size_t) { return std::make_shared<C>(); })
{
}
template <
typename U = C,
typename = typename std::enable_if<
!ConstructorInitialize ||
!std::is_same<StoragePtrType<U>, std::shared_ptr<U>>::value>::type,
typename = U>
template <typename U = C,
typename = typename std::enable_if<!AutoInit, U>::type,
typename = U>
IOThreadStorage() : IOThreadStorage([](size_t) { return nullptr; })
{
}