This is a constant value that identifies the proximate cause of the error. Error reasons are unique within a particular domain of errors. This should be at most 63 characters and match a regular expression of [A-Z][A-Z0-9_]+[A-Z0-9], which represents UPPER_SNAKE_CASE.
Returns
Type
Description
std::string const &
domain() const
The logical grouping to which the "reason" belongs.
The error domain is typically the registered service name of the tool or product that generates the error. Example: "pubsub.googleapis.com". If the error is generated by some common infrastructure, the error domain must be a globally unique value that identifies the infrastructure. For Google API infrastructure, the error domain is "googleapis.com".
For errors generated by the C++ client libraries the domain is gcloud-cpp.
Returns
Type
Description
std::string const &
metadata() const
Additional structured details about this error.
Keys should match the regular expression [a-zA-Z0-9-_] and be limited to 64 characters in length.
When identifying the current value of an exceeded limit, the units should be contained in the key, not the value. For example, if the client exceeds the number of instances that can be created in a single (batch) request return {"instanceLimitPerRequest": "100"} rather than {"instanceLimit": "100/request"}.
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe provided content details the \u003ccode\u003eErrorInfo\u003c/code\u003e class in the Google Cloud C++ client library, which is used to describe the cause of an error with structured details, as specified by the error information design.\u003c/p\u003e\n"],["\u003cp\u003eThis page contains documentation for the \u003ccode\u003eErrorInfo\u003c/code\u003e class across multiple versions, ranging from the latest release candidate (2.37.0-rc) down to version 2.10.1.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eErrorInfo\u003c/code\u003e class can be constructed using either a default constructor or a constructor that takes \u003ccode\u003ereason\u003c/code\u003e, \u003ccode\u003edomain\u003c/code\u003e, and \u003ccode\u003emetadata\u003c/code\u003e parameters to provide context to the error.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eErrorInfo\u003c/code\u003e class provides functions \u003ccode\u003ereason()\u003c/code\u003e, \u003ccode\u003edomain()\u003c/code\u003e, and \u003ccode\u003emetadata()\u003c/code\u003e to retrieve specific information about an error, such as its cause, logical grouping, and additional structured details.\u003c/p\u003e\n"],["\u003cp\u003eThe error domain for errors generated by the C++ client libraries is \u003ccode\u003egcloud-cpp\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,[]]
