每个人都有秘密，但在好与坏，真与假之间的界限模糊不清，你要如何面对永久的、也是最致命的后果呢？
Everyone has secrets, but when the lines between right and wrong, good and bad, true and false, become blurred, how do you cope with the lasting and deadly consequences?
在使用函数模板时，如果你定义了多个重载的特例化函数，可能导致模糊不清的调用，所以这时编译器会从中选择最特例的那个函数定义来调用。
A function template specialization might be ambiguous because template argument deduction might associate the specialization with more than one of the overloaded definitions .
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