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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-18 UTC."],[[["The library uses `StatusOr\u003cT\u003e` to signal errors instead of throwing exceptions."],["`StatusOr\u003cT\u003e` can be checked for a value using `.ok()` or `operator bool()`, and if there is no value, the `Status` object can be accessed with `.status()`."],["If a `StatusOr\u003cT\u003e` contains a value, it can be accessed using `operator*()` or `operator-\u003e()`, similar to smart pointers, or using `.value()` which throws a `RuntimeStatusError` if there is no value, or terminates if exceptions are disabled."],["Asynchronous operations return a `future\u003cStatusOr\u003cT\u003e\u003e`, requiring checks to determine if the operation completed successfully."],["The documentation contains links to further information on `google::cloud::StatusOr`, `google::cloud::Status` and `google::cloud::future`."]]],[]]
