This library never throws exceptions to signal error. In general, the library returns a StatusOr if an error is possible. Some functions return objects that are not wrapped in a StatusOr<T> but will themselves return a StatusOr<T> to signal an error. For example, wrappers for asynchronous operations return future<StatusOr<T>>.
Applications should check if the StatusOr<T> contains a value before using it, much like how you might check that a pointer is not null before dereferencing it. Indeed, a StatusOr<T> object can be used like a smart-pointer to T, with the main difference being that when it does not hold a T it will instead hold a Status object with extra information about the error.
You can check that a StatusOr<T> contains a value by calling the .ok() method, or by using operator bool() (like with other smart pointers). If there is no value, you can access the contained Status object using the .status() member. If there is a value, you may access it by dereferencing with operator*() or operator->(). As with all smart pointers, callers must first check that the StatusOr<T> contains a value before dereferencing and accessing the contained value. Alternatively, callers may instead use the .value() member function which is defined to throw a RuntimeStatusError if there is no value.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-09 UTC."],[[["The library avoids throwing exceptions for errors, instead utilizing `StatusOr` to indicate if an operation was successful or encountered an error."],["Applications should check if a `StatusOr\u003cT\u003e` contains a value before using it, similar to checking if a pointer is not null, by using the `.ok()` method or `operator bool()`."],["If a `StatusOr\u003cT\u003e` does not contain a value, the `.status()` member can be used to retrieve the `Status` object detailing the error, otherwise, the contained value can be accessed using `operator*()` or `operator-\u003e()`."],["Alternatively, `.value()` can be used to retrieve the contained value, which will throw a `RuntimeStatusError` if there is no value, or terminate the program if exceptions are disabled."],["The documentation provides links to `google::cloud::StatusOr`, `google::cloud::Status`, and `google::cloud::future` for further details on error handling and asynchronous operations."]]],[]]
