push_back and assign function for rvalues passing with their test cas…

…es for rvalues

source/stdcpp/test/vector.d

@@ -7,13 +7,11 @@
 module stdcpp.test.vector;
 import stdcpp.vector;
 import stdcpp.allocator;
-int a = 42;
-int b = 9;
 allocator!int alloc_instance = allocator!(int).init;
 unittest
 {
     auto vec = vector!int(4, alloc_instance);
-    vec.push_back(a);
+    vec.push_back(42);
     assert(vec.length == 5);
     assert(vec[4] == 42);
 	assert(vec.at(3) == 0);
@@ -27,16 +25,19 @@ unittest
 
 unittest
 {
+	int b = 9;
 	auto p = vector!int(4, b, alloc_instance);
 	assert(p.capacity() == 4);
 	p.reserve(6);
 	assert(p.capacity() == 6);
 	//3 push backs to reallocate memory by 2 after initially capacity fills up
-	p.push_back(a);
-	p.push_back(a);//capacity is 6 now
-	p.push_back(a);
+	p.push_back(9);
+	p.push_back(9);//capacity is 6 now
+	p.push_back(9);
 	assert(p.capacity() == 12);
 	p.resize(5);
 	assert(p.length == 5);
 	assert(p.sizeof == 24);//verifying three pointers
+	p.assign(3,8);
+	assert(p.length == 3);
 }

source/stdcpp/vector.d

@@ -774,6 +774,15 @@ extern(D):
 			return size_type(this._M_finish - this._M_start);
 		}
 
+		extern(D) void push_back(const T item)
+		{
+			return this.push_back(item);
+		}
+
+		extern(D) void assign(size_t n, const T x)
+		{
+			return this.assign(n,x);
+		}
 
 		size_t capacity() const @safe nothrow pure @nogc
 		{