未定义的函数或变量' sqt '。
这些标记引起的常见错误是:不正确的引用和取消引用,使用未定义的值,以及帮助判断输入错误,例如未使用的值或未定义的函数。
Common faults picked up by these pragmas are ambiguous references and de-references, use of undefined values, and some help identifying typos for unused or undefined functions.
如果二者都未定义,那么编译器会提供一种作为公共成员函数的隐式版本。
If neither of the two is defined, the compiler provides an implicit version that is a public member function.
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