HRESULTlike

HRESULTlike refers to error-reporting conventions that resemble the Windows HRESULT system. It describes a family of 32-bit status codes used to communicate both success or failure and metadata about the source or category of the result. The term is often used when discussing cross-language bindings, wrappers, or custom return-value schemes that adopt the same general idea as HRESULT.

Structure and semantics

A typical HRESULTlike value encodes three pieces of information: a severity or success flag, a facility or subsystem indicator, and a specific error or status code. In the Windows HRESULT scheme, for example, the high bit indicates failure when interpreted as a signed value; zero indicates success (S_OK), while other nonzero values can denote distinct opinions such as S_FALSE or specific error codes. The facility field helps categorize the source of the error (for instance, a particular subsystem or component), and the code field identifies the exact condition within that category.

Common examples and conventions

Real-world use often mirrors Windows conventions. Examples include S_OK (0x00000000) for success, S_FALSE (0x00000001) for a successful operation with a non-true result, and error codes such as E_NOTIMPL (0x80004001), E_FAIL (0x80004005), E_ABORT (0x80004004), and E_ACCESSDENIED (0x80070005). In code, helper macros or functions such as SUCCEEDED(hr) and FAILED(hr) are used to test the overall outcome, while tools may provide facilities to extract the facility or translate codes to messages.

Usage and considerations

HRESULTlike codes are common in Windows APIs and COM-related interop, and they appear in some cross-platform libraries and language bindings that aim to preserve rich status information. When designing or using such a scheme in other environments, considerations include consistency of mappings to exceptions or error objects, ease of logging and debugging, and clear documentation of the meaning of each facility and code.