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From cppreference.com < cpp | keyword . C++. Compiler support: Freestanding and hosted: Language: Standard library: Standard library headers: Named requirements: ... auto placeholder type specifier; Function declaration with trailing return type (since C++11) Structured binding declaration (since C++17)
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Betaauto was a keyword that C++ "inherited" from C that had been there nearly forever, but virtually never used because there were only two possible conditions: either it wasn't allowed, or else it was assumed by default.. The use of auto to mean a deduced type was new with C++11.. At the same time, auto x = initializer deduces the type of x from the type of initializer the same way as template ...
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BetaExplanation. 1) When declaring variables in block scope, in namespace scope, in init statements of for loops, etc, the type of the variable may be omitted and the keyword auto may be used instead.. Once the type of the initializer has been determined, the compiler determines the type that will replace the keyword auto as if using the rules for template argument deduction from a function call.
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Betaa declaration with the auto specifier could define two variables with types T and std:: initializer_list < T > respectively prohibited CWG 1852: C++14 the auto specifier in decltype (auto) was also a placeholder not a placeholder in this case CWG 1892: C++11 the return type of a function pointer type-id could be auto: prohibited CWG 2476: C++11
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BetaRetrieved from "https://en.cppreference.com/mwiki/index.php?title=c/keyword/auto&oldid=153927"
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BetaIn short, auto deduces core type, while decltype deduces exact type. That is, auto will remove the const and & modifiers when deducing types. const int ci = 0, &cr = ci; auto y = ci; //(top-level) const is removed, so the type of y is int auto y2 = cr; //both & and (top-level) const is removed, so the type of y2 is still int
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BetaThe auto keyword can be used as either a storage class specifier or for type inference (since C23).
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Beta自动存储期说明符 (until C++11) auto 占位符类型说明符; 具有尾随返回类型的函数声明 (since C++11) 结构化绑定声明 (since C++17) 缩写函数模板
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BetaC++11 introduces the keyword auto as a new type specifier.auto acts as a placeholder for a type to be deduced from the initializer expression of a variable. With auto type deduction enabled, you no longer need to specify a type while declaring a variable. Instead, the compiler deduces the type of an auto variable from the type of its initializer expression.
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Betacppreference.com > C/C++ Keywords > auto. auto . The keyword auto is used to declare local variables, and is purely optional. Related topics: register. previous page start next page. Menu. Homepage; Table of contents. www.cppreference.com. General C/C++. Keywords.
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