Tutorial by Examples: caluse



Unions are useful for minimizing memory usage for exclusive data, such as when implementing mixed data types. struct AnyType { enum { IS_INT, IS_FLOAT } type; union Data { int as_int; float as_float; } value; AnyType(int i) : type...
SELECT E.EMPLOYEE_ID,E.LAST_NAME,E.MANAGER_ID FROM HR.EMPLOYEES E CONNECT BY PRIOR E.EMPLOYEE_ID = E.MANAGER_ID; The CONNECT BY clause to define the relationship between employees and managers.
Deconstructing the use of an unsafe pointer in the Swift library method; public init?(validatingUTF8 cString: UnsafePointer<CChar>) Purpose: Creates a new string by copying and validating the null-terminated UTF-8 data referenced by the given pointer. This initializer does not try to rep...

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