diff --git a/libs/optional/test/optional.cpp b/libs/optional/test/optional.cpp
index 6407ac14..37f5b9e9 100644
--- a/libs/optional/test/optional.cpp
+++ b/libs/optional/test/optional.cpp
@@ -17,28 +17,59 @@ namespace testspr {
 				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>();
 				TESTSPR_BOTH_ASSERT(!opt3);
 			}
-			{
-				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(1234);
-				TESTSPR_BOTH_ASSERT(!!opt3);
-			}
 			{
 				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(sprout::nullopt);
 				TESTSPR_BOTH_ASSERT(!opt3);
 			}
 			{
-				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(sprout::nullopt);
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(opt1);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(sprout::optional<int>(1234));
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto v = 1234;
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(v);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(1234);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(sprout::in_place, 1234);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto v = 1234;
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(false, v);
 				TESTSPR_BOTH_ASSERT(!opt3);
 			}
 			{
 				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(false, 1234);
 				TESTSPR_BOTH_ASSERT(!opt3);
-
-				SPROUT_STATIC_CONSTEXPR auto opt4 = sprout::optional<int>(true, 1234);
-				TESTSPR_BOTH_ASSERT(!!opt4);
-				TESTSPR_BOTH_ASSERT(opt4.get() == 1234);
 			}
 			{
-				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(opt1);
+				SPROUT_STATIC_CONSTEXPR auto v = 1234;
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(true, v);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(true, 1234);
+				TESTSPR_BOTH_ASSERT(!!opt3);
+				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
+			}
+			{
+				SPROUT_STATIC_CONSTEXPR auto v = sprout::optional<unsigned>(1234);
+				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::optional<int>(v);
 				TESTSPR_BOTH_ASSERT(!!opt3);
 				TESTSPR_BOTH_ASSERT(opt3.get() == 1234);
 			}
@@ -54,18 +85,38 @@ namespace testspr {
 				opt3 = sprout::nullopt;
 				TESTSPR_ASSERT(!opt3);
 			}
-			{
-				auto opt3 = sprout::optional<int>();
-				opt3 = 1234;
-				TESTSPR_ASSERT(!!opt3);
-				TESTSPR_ASSERT(opt3.get() == 1234);
-			}
 			{
 				auto opt3 = sprout::optional<int>();
 				opt3 = opt1;
 				TESTSPR_ASSERT(!!opt3);
 				TESTSPR_ASSERT(opt3.get() == 1234);
 			}
+			{
+				auto opt3 = sprout::optional<int>();
+				opt3 = sprout::optional<int>(1234);
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				auto v = 1234;
+				opt3 = v;
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				opt3 = 1234;
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				auto v = sprout::optional<unsigned>(1234);
+				opt3 = v;
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
 			{
 				auto opt3 = sprout::optional<int>();
 				opt3 = sprout::optional<unsigned>(1234);
@@ -73,12 +124,39 @@ namespace testspr {
 				TESTSPR_ASSERT(opt3.get() == 1234);
 			}
 
+			// emplace
+			{
+				auto opt3 = sprout::optional<int>();
+				opt3.emplace(1234);
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+
 			// assign
 			{
 				auto opt3 = sprout::optional<int>(1234);
 				opt3.assign(sprout::nullopt);
 				TESTSPR_ASSERT(!opt3);
 			}
+			{
+				auto opt3 = sprout::optional<int>();
+				opt3.assign(opt1);
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				opt3.assign(sprout::optional<int>(1234));
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				auto v = 1234;
+				opt3.assign(v);
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
 			{
 				auto opt3 = sprout::optional<int>();
 				opt3.assign(1234);
@@ -87,7 +165,8 @@ namespace testspr {
 			}
 			{
 				auto opt3 = sprout::optional<int>();
-				opt3.assign(opt1);
+				auto v = sprout::optional<unsigned>(1234);
+				opt3.assign(v);
 				TESTSPR_ASSERT(!!opt3);
 				TESTSPR_ASSERT(opt3.get() == 1234);
 			}
@@ -109,6 +188,13 @@ namespace testspr {
 				opt3.reset(sprout::nullopt);
 				TESTSPR_ASSERT(!opt3);
 			}
+			{
+				auto opt3 = sprout::optional<int>();
+				auto v = 1234;
+				opt3.reset(v);
+				TESTSPR_ASSERT(!!opt3);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+			}
 			{
 				auto opt3 = sprout::optional<int>();
 				opt3.reset(1234);
@@ -134,40 +220,6 @@ namespace testspr {
 				TESTSPR_ASSERT(opt4.get() == 1234);
 			}
 
-			// operator*
-			TESTSPR_BOTH_ASSERT(*opt1 == 1234);
-			{
-				auto opt3 = sprout::optional<int>(1234);
-				TESTSPR_ASSERT(*opt3 == 1234);
-
-				*opt3 = 12345;
-				TESTSPR_ASSERT(*opt3 == 12345);
-			}
-
-			// get
-			TESTSPR_BOTH_ASSERT(opt1.get() == 1234);
-			{
-				auto opt3 = sprout::optional<int>(1234);
-				TESTSPR_ASSERT(opt3.get() == 1234);
-
-				opt3.get() = 12345;
-				TESTSPR_ASSERT(opt3.get() == 12345);
-			}
-
-			// get_value_or
-			TESTSPR_BOTH_ASSERT(opt1.get_value_or(12345) == 1234);
-			TESTSPR_BOTH_ASSERT(opt2.get_value_or(12345) == 12345);
-			{
-				auto opt3 = sprout::optional<int>(1234);
-				int v = 12345;
-				TESTSPR_ASSERT(opt3.get_value_or(v) == 1234);
-			}
-			{
-				auto opt3 = sprout::optional<int>();
-				int v = 12345;
-				TESTSPR_ASSERT(opt3.get_value_or(v) == 12345);
-			}
-
 			// operator->
 			{
 				SPROUT_STATIC_CONSTEXPR auto opt3 = sprout::make_optional(testspr::is_odd<int>());
@@ -198,6 +250,64 @@ namespace testspr {
 				TESTSPR_ASSERT(*opt3.get_ptr() == 12345);
 			}
 
+			// operator*
+			TESTSPR_BOTH_ASSERT(*opt1 == 1234);
+			{
+				auto opt3 = sprout::optional<int>(1234);
+				TESTSPR_ASSERT(*opt3 == 1234);
+
+				*opt3 = 12345;
+				TESTSPR_ASSERT(*opt3 == 12345);
+			}
+
+			// value
+			TESTSPR_BOTH_ASSERT(opt1.value() == 1234);
+			{
+				auto opt3 = sprout::optional<int>(1234);
+				TESTSPR_ASSERT(opt3.value() == 1234);
+
+				opt3.value() = 12345;
+				TESTSPR_ASSERT(opt3.value() == 12345);
+			}
+
+			// get
+			TESTSPR_BOTH_ASSERT(opt1.get() == 1234);
+			{
+				auto opt3 = sprout::optional<int>(1234);
+				TESTSPR_ASSERT(opt3.get() == 1234);
+
+				opt3.get() = 12345;
+				TESTSPR_ASSERT(opt3.get() == 12345);
+			}
+
+			// value_or
+			TESTSPR_BOTH_ASSERT(opt1.value_or(12345) == 1234);
+			TESTSPR_BOTH_ASSERT(opt2.value_or(12345) == 12345);
+			{
+				auto opt3 = sprout::optional<int>(1234);
+				int v = 12345;
+				TESTSPR_ASSERT(opt3.value_or(v) == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				int v = 12345;
+				TESTSPR_ASSERT(opt3.value_or(v) == 12345);
+			}
+
+			// get_value_or
+			TESTSPR_BOTH_ASSERT(opt1.get_value_or(12345) == 1234);
+			TESTSPR_BOTH_ASSERT(opt2.get_value_or(12345) == 12345);
+			{
+				auto opt3 = sprout::optional<int>(1234);
+				int v = 12345;
+				TESTSPR_ASSERT(opt3.get_value_or(v) == 1234);
+			}
+			{
+				auto opt3 = sprout::optional<int>();
+				int v = 12345;
+				TESTSPR_ASSERT(opt3.get_value_or(v) == 12345);
+			}
+
 			// operator bool
 			TESTSPR_BOTH_ASSERT(static_cast<bool>(opt1));
 			TESTSPR_BOTH_ASSERT(!static_cast<bool>(opt2));
diff --git a/sprout/optional/optional.hpp b/sprout/optional/optional.hpp
index d8800af0..38a6654b 100644
--- a/sprout/optional/optional.hpp
+++ b/sprout/optional/optional.hpp
@@ -151,6 +151,23 @@ namespace sprout {
 			return *this;
 		}
 
+		template<
+			typename... Args,
+			typename = typename std::enable_if<std::is_constructible<T, Args&&...>::value>::type
+		>
+		void emplace(Args&&... args) {
+			optional temp(sprout::in_place, sprout::forward<Args>(args)...);
+			temp.swap(*this);
+		}
+		template<
+			typename U, typename... Args,
+			typename = typename std::enable_if<std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value>::type
+		>
+		void emplace(std::initializer_list<U> il, Args&&... args) {
+			optional temp(sprout::in_place, il, sprout::forward<Args>(args)...);
+			temp.swap(*this);
+		}
+
 		void assign(sprout::nullopt_t) SPROUT_NOEXCEPT {
 			destroy();
 		}