diff --git a/src/sled/futures/future.h b/src/sled/futures/future.h
index b874cec..9cedbed 100644
--- a/src/sled/futures/future.h
+++ b/src/sled/futures/future.h
@@ -1,6 +1,7 @@
 #ifndef SLED_FUTURES_FUTURE_H
 #define SLED_FUTURES_FUTURE_H
 
+#include <exception>
 #pragma once
 #include "sled/exec/detail/invoke_result.h"
 #include "sled/futures/internal/failure_handling.h"
@@ -82,6 +83,28 @@ public:
     Future<T, FailureT> &operator=(Future<T, FailureT> &&) noexcept      = default;
     ~Future()                                                            = default;
 
+    Future(const T &value) noexcept
+    {
+        static_assert(!std::is_same<T, FailureT>::value, "T and FailureT must be different types");
+        data_ = Future<T, FailureT>::Create().data_;
+        FillSuccess(value);
+    }
+
+    Future(T &&value) noexcept
+    {
+        static_assert(!std::is_same<T, FailureT>::value, "T and FailureT must be different types");
+        data_ = Future<T, FailureT>::Create().data_;
+        FillSuccess(std::move(value));
+    }
+
+    template<typename = typename std::enable_if<!std::is_same<T, FailureT>::value>>
+    Future(const FailureT &failure) noexcept
+    {
+        static_assert(!std::is_same<T, FailureT>::value, "T and FailureT must be different types");
+        data_ = Future<T, FailureT>::Create().data_;
+        FillFailure(failure);
+    }
+
     bool operator==(const Future<T, FailureT> &other) const noexcept { return data_ == other.data_; }
 
     bool operator!=(const Future<T, FailureT> &other) const noexcept { return !operator==(other); }
@@ -359,7 +382,7 @@ public:
         return result;
     }
 
-    static Future<T, FailureT> successful(const T &value) noexcept
+    static Future<T, FailureT> Successful(const T &value) noexcept
     {
         Future<T, FailureT> result = Future<T, FailureT>::Create();
         result.FillSuccess(value);
diff --git a/src/sled/futures/future_test.cc b/src/sled/futures/future_test.cc
index 36ba3c9..67a1878 100644
--- a/src/sled/futures/future_test.cc
+++ b/src/sled/futures/future_test.cc
@@ -115,5 +115,13 @@ TEST_SUITE("future")
         CHECK_FALSE(f2.IsFailed());
         auto f3 = sled::Future<std::string>::AsyncValue("11");
         CHECK_EQ(f3.Result(), "11");
+    TEST_CASE("Constructor")
+    {
+        sled::Future<int, std::string> f1 = 1;
+        sled::Future<int, std::string> f2 = std::string("1");
+        REQUIRE(f1.IsCompleted());
+        REQUIRE(f2.IsFailed());
+        REQUIRE_EQ(f1.Result(), 1);
+        REQUIRE_EQ(f2.FailureReason(), "1");
     }
 }
diff --git a/src/sled/futures/internal/promise.h b/src/sled/futures/internal/promise.h
index 642f727..79201ca 100644
--- a/src/sled/futures/internal/promise.h
+++ b/src/sled/futures/internal/promise.h
@@ -11,32 +11,32 @@ template<typename T, typename FailureT>
 class Future;
 
 template<typename T, typename FailureT = std::exception>
-class Promise {
+class Promise final {
     static_assert(!std::is_same<T, void>::value, "Promise<void, _> is not allowed. Use Promise<bool, _> instead");
     static_assert(!std::is_same<FailureT, void>::value,
                   "Promise<_, void> is not allowed. Use Promise<_, bool> instead");
 
 public:
-    using Value                                  = T;
-    Promise()                                    = default;
-    Promise(const Promise &) noexcept            = default;
-    Promise(Promise &&) noexcept                 = default;
-    Promise &operator=(const Promise &) noexcept = default;
-    Promise &operator=(Promise &&) noexcept      = default;
-    ~Promise()                                   = default;
+    using Value                             = T;
+    Promise()                               = default;
+    Promise(const Promise &)                = default;
+    Promise(Promise &&) noexcept            = default;
+    Promise &operator=(const Promise &)     = default;
+    Promise &operator=(Promise &&) noexcept = default;
+    ~Promise()                              = default;
 
     Future<T, FailureT> GetFuture() const { return future_; };
 
     bool IsFilled() const noexcept { return future_.IsCompleted(); }
 
-    void Failure(const FailureT &reason) { return future_.FillFailure(reason); }
+    void Failure(const FailureT &reason) const noexcept { return future_.FillFailure(reason); }
 
-    void Success(const T &value) { return future_.FillSuccess(value); }
+    void Success(const T &value) const noexcept { return future_.FillSuccess(value); }
 
-    void Success(T &&value) { return future_.FillSuccess(std::move(value)); }
+    void Success(T &&value) const noexcept { return future_.FillSuccess(std::move(value)); }
 
 private:
-    Future<T, FailureT> future_ = Future<T, FailureT>::Create();
+    mutable Future<T, FailureT> future_ = Future<T, FailureT>::Create();
 };
 }// namespace sled
 
diff --git a/src/sled/nonstd/fsm.h b/src/sled/nonstd/fsm.h
index ba482ad..2e72ba6 100644
--- a/src/sled/nonstd/fsm.h
+++ b/src/sled/nonstd/fsm.h
@@ -61,7 +61,8 @@ struct is_invocable_test {
 };
 
 template<class F, class... Args>
-using is_invocable = typename std::integral_constant<bool, sizeof(is_invocable_test::test<F, Args...>(0)) == 1>::type;
+using fsm_is_invocable =
+    typename std::integral_constant<bool, sizeof(is_invocable_test::test<F, Args...>(0)) == 1>::type;
 #else
 #error "fsmlite requires C++11 support."
 #endif
@@ -101,10 +102,10 @@ invoke(M T::*f, T1 &&obj, Args &&...args)
 template<class F,
          class Arg1,
          class Arg2,
-         bool f1 = is_invocable<F>::value,
-         bool f2 = is_invocable<F, Arg1>::value,
-         bool f3 = is_invocable<F, Arg2>::value,
-         bool f4 = is_invocable<F, Arg1, Arg2>::value>
+         bool f1 = fsm_is_invocable<F>::value,
+         bool f2 = fsm_is_invocable<F, Arg1>::value,
+         bool f3 = fsm_is_invocable<F, Arg2>::value,
+         bool f4 = fsm_is_invocable<F, Arg1, Arg2>::value>
 struct binary_fn_helper;
 
 template<class F, class Arg1, class Arg2>
diff --git a/src/sled/uri.h b/src/sled/uri.h
index 1658988..82c7322 100644
--- a/src/sled/uri.h
+++ b/src/sled/uri.h
@@ -70,6 +70,11 @@ private:
 
     bool has_authority_ = false;
 };
+
+#undef __SLED_URI_GETTER_AND_SETTER
+#undef __SLED_URI_GETTER
+#undef __SLED_URI_SETTER
+
 }// namespace sled
 
 #endif//  SLED_URI_H