auto c++
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The auto keyword is a declaration specifier. However, the C++ standard defines an original and a revised meaning for this keyword. Before Visual C++ 2010, the auto keyword declares a variable in the automatic storage class; that is, a variable that has a local lifetime. Starting with Visual C++ 2010, the auto keyword declares a variable whose type is deduced from the initialization expression in its declaration. The /Zc:auto[-] compiler option controls the meaning of the auto keyword.
從2010起 auto用在聲明一個變量 由whose type is deduced from the initialization expression in its declaration(在auto聲明變量的初始化語句 ,也就是new語句)
編譯時記得加/Zc:auto[-]
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