In the C++ programming language, decltype (for "declared type") is a keyword used to query the type of an expression. Introduced in C++11, its primary intended use is in generic programming, where it is often difficult, or even impossible, to express types that depend on template parameters.
在C++程序设计语言中，decltype作为操作符，用于获取表达式的数据类型。C++11标准引入decltype，主要是为泛型编程而设计，以解决泛型编程中有些類型由模板参数决定而难以（甚至不可能）表示的问题。 从语义上说，decltype的设计适合於通用库编写者或编程新手。总体上说，对于变量或函数参数作为表达式，由decltype推导出的类型与源码中的定义可精确匹配。而正如sizeof操作符一样，decltype不对操作数求值。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).