Improved PIBlockingDeque constructors

- resolve creation from constant (see test construct_from_constant_is_max_size_eq_capacity)
- add tests for constructors

lib/main/thread/piblockingdequeue.h

@@ -41,7 +41,8 @@ public:
 	/**
 	 * @brief Copy constructor. Initialize queue with copy of other container elements. Not thread-safe for other queue.
 	 */
-	template<typename Iterable>
+	template<typename Iterable,
+			 typename std::enable_if<!std::is_arithmetic<Iterable>::value, int>::type = 0>
 	explicit PIBlockingDequeue(const Iterable& other): PIBlockingDequeue() {
 		mutex.lock();
 		for (const T& t : other) data_queue.push_back(t);
@@ -51,7 +52,7 @@ public:
 	/**
 	 * @brief Thread-safe copy constructor. Initialize queue with copy of other queue elements.
 	 */
-	inline PIBlockingDequeue(PIBlockingDequeue<T>& other): PIBlockingDequeue() {
+	explicit PIBlockingDequeue(PIBlockingDequeue<T>& other): PIBlockingDequeue() {
 		other.mutex.lock();
 		mutex.lock();
 		max_size = other.max_size;