Changeset 3404

Timestamp:

Apr 3, 2015, 9:36:12 AM (8 years ago)

Author:

Peter

Message:

new function to reduce capacity in a vector

Location:

trunk

Files:

• test/utility.cc (modified) (1 diff)
• yat/utility/stl_utility.h (modified) (1 diff)

trunk/test/utility.cc

@@ -219 +219 @@
   long double xld = 8.0;
   suite.add(suite.equal(utility::log2(xld), 3.0));
+
+  std::vector<std::string> vec(1, "text");
+  utility::clear(vec);
+  suite.add(vec.size()==0);
 
   test_basename(suite);

trunk/yat/utility/stl_utility.h

@@ -466 +466 @@
 
   /**
+     \brief reduce size and capacity to zero
+
+     The standard provides a member function clear(void), which clears
+     the contents of the vector i.e. sets the size to zero. However,
+     the member function might leave the capacity unchanged and
+     sometimes, when it's desiribale to save memory usage e.g., it
+     preferable to use this function, which reduces the capacity to zero.
+
+     \since new in yat 0.13
+   */
+  template<typename T>
+  void clear(std::vector<T>& vec)
+  {
+    std::vector<T> other;
+    vec.swap(other);
+  }
+
+
+  /**
      Same functionality as map::operator[] but the function does not
      modify the map and the function throws if key does not exist in