了解隱型介面，以及編譯時期的多型 。
item 42：Understand the two meanings of typename
了解 typename 兩種不同的意義。
item 43：Know how to access names in templatized base classes
item 44：Factor parameter-independent code out of template
item 45：Use member function templates to accept all compatible types
item 46：Define non-member functions inside templates when type conversions are desired
item 47：Use traits classes for information about type
以 traits classes 來對型別做分類及辨視型別。
item 48：Be aware of template metaprogramming
了解 meta-programming，將執行時期的運算提早至編譯期，以提高效率。
item 49：Understand the behavior of the new-handler
item 50：Understand when it makes sense to replace new and delete
item 51：Adhere to convention when writing new and delete
item 52：Write placement delete if you write placement new
item 53：Pay attention to compiler warnings
item 54：Familiarize yourself with the standard library, include TR1
item 55：Familiarize yourself with Boost
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