deprecated and deprecatedreason

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C++14 introduced a standard way of deprecating functions via attributes. [[deprecated]] can be used to indicate that a function is deprecated. [[deprecated("reason")]] allows adding a specific reason which can be shown by the compiler.

void function(std::unique_ptr<A> &&a);

// Provides specific message which helps other programmers fixing there code
[[deprecated("Use the variant with unique_ptr instead, this function will be removed in the next release")]]
void function(std::auto_ptr<A> a);

// No message, will result in generic warning if called.
void function(A *a);

This attribute may be applied to:

(ref. c++14 standard draft: 7.6.5 Deprecated attribute)

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