diff --git a/src/yu/container/cirularqueue.d b/src/yu/container/cirularqueue.d
index 73c3fb5..54aa5c0 100644
--- a/src/yu/container/cirularqueue.d
+++ b/src/yu/container/cirularqueue.d
@@ -16,7 +16,7 @@ import yu.container.common;
         Allocator = which type Allocator will used
 */
 
-@trusted struct CirularQueue(T, Allocator = GCAllocator, bool autoExten = false, bool addInGC = true) {
+@trusted struct CirularQueue(T, Allocator = GCAllocator, bool autoExten = false, bool addInGC = true)  if(is(T == Unqual!T)) {
     enum TSize = T.sizeof;
     enum addToGC = addInGC && hasIndirections!T && !is(Unqual!Allocator == GCAllocator);
     static if (hasIndirections!T)
diff --git a/src/yu/container/common.d b/src/yu/container/common.d
index 720f643..4608a06 100644
--- a/src/yu/container/common.d
+++ b/src/yu/container/common.d
@@ -1,6 +1,7 @@
 module yu.container.common;
 
 import core.atomic;
+import std.traits : Unqual;
 import std.experimental.allocator;
 
 
@@ -78,7 +79,7 @@ mixin template Refcount()
 }
 
 /// Array Cow Data
-struct ArrayCOWData(T, Allocator,bool inGC = false)
+struct ArrayCOWData(T, Allocator,bool inGC = false)  if(is(T == Unqual!T))
 {
     import core.memory : GC;
     import std.exception : enforce;
diff --git a/src/yu/container/string.d b/src/yu/container/string.d
index 2a06517..d606ec5 100644
--- a/src/yu/container/string.d
+++ b/src/yu/container/string.d
@@ -16,7 +16,8 @@ alias WString   = IWString!(Mallocator);
 alias DString   = IDString!(Mallocator);
 
 // The Cow String
-@trusted struct StringImpl(Char, Allocator)
+@trusted struct StringImpl(Char, Allocator) 
+                if(is(Char == Unqual!Char) && isSomeChar!Char)
 {
     alias Data = ArrayCOWData!(Char, Allocator);
     static if (StaticAlloc!Allocator)
diff --git a/src/yu/container/vector.d b/src/yu/container/vector.d
index 045c424..f4c67cf 100644
--- a/src/yu/container/vector.d
+++ b/src/yu/container/vector.d
@@ -17,7 +17,7 @@ import yu.array;
     2. 不允许copy： 对于引用类型 和 指针
 */
 
-@trusted struct Vector(T, Allocator = Mallocator, bool addInGC = true) //if(!(hasIndirections!T))
+@trusted struct Vector(T, Allocator = Mallocator, bool addInGC = true) if(is(T == Unqual!T))
 {
     enum addToGC = addInGC && hasIndirections!T && !is(Unqual!Allocator == GCAllocator);
     enum needDestroy = (is(T == struct) && hasElaborateDestructor!T);
@@ -462,4 +462,6 @@ unittest {
         1541515, 15415, 1545, 1545, 1545, 1545, 15454, 0, 54154]);
 
     vec22 ~=  [0, 1, 2, 1, 212];
+
+    //Vector!(shared int) vec2;
 }