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A sink to receive log records.
Constructors LogSink Functions emptyReturn true if this object has no backends.
We want to avoid synchronization overhead when checking if a log message is enabled. Most of the time, most messages will be disabled, so incurring the locking overhead on each message would be too expensive and would discourage developers from creating logs. Furthermore, missing a few messages while the change of state "propagates" to other threads does not affect the correctness of the program.
Note that memory_order_relaxed does not provide a compiler barrier either, so in theory stores into the atomic could be reordered by the optimizer. We have no reason to worry about that because all the writes are done inside a critical section protected by a mutex. The compiler cannot (or should not) reorder operations around those.
bool is_enabled
Return true if severity is enabled.
We want to avoid synchronization overhead when checking if a log message is enabled. Most of the time, most messages will be disabled, so incurring the locking overhead on each message would be too expensive and would discourage developers from creating logs. Furthermore, missing a few messages while the change of state "propagates" to other threads does not affect the correctness of the program.
Note that memory_order_relaxed does not provide a compiler barrier either, so in theory stores into the atomic could be reordered by the optimizer. We have no reason to worry about that because all the writes are done inside a critical section protected by a mutex. The compiler cannot (or should not) reorder operations around those.
severity Severity
bool set_minimum_severity Parameter Name Description minimum Severity
void minimum_severity Returns Type Description Severity AddBackend Parameter Name Description backend std::shared_ptr< LogBackend >
BackendId RemoveBackend Parameter Name Description id BackendId
void ClearBackends Returns Type Description void BackendCount Returns Type Description std::size_t Log Parameter Name Description log_record LogRecord
void Flush
Flush all the current backends.
Returns Type Descriptionvoid CompileTimeEnabled
Return true if the severity is enabled at compile time.
Parameter Name Descriptionlevel Severity
bool constexpr Instance
Return the singleton instance for this application.
Returns Type DescriptionLogSink & EnableStdClog
Enable std::clog on LogSink::Instance().
This is also enabled if the "GOOGLE_CLOUD_CPP_ENABLE_CLOG" environment variable is set.
Parameter Name Descriptionmin_severity Severity
void DisableStdClog
Disable std::clog on LogSink::Instance().
Note that this will remove the default logging backend.
Returns Type Descriptionvoid
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Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This document provides the C++ reference documentation for the `LogSink` class, a component designed to receive and manage log records."],["The latest version of the `LogSink` class is `2.37.0-rc`, with a comprehensive list of previous versions also available for reference, ranging from `2.10.1` to `2.36.0`."],["`LogSink` offers functions such as `empty`, `is_enabled`, `set_minimum_severity`, `AddBackend`, `RemoveBackend`, and `Log`, enabling developers to manage log behaviors and backends effectively."],["Developers can control the output of logs, including the ability to enable or disable `std::clog` output with `EnableStdClog` and `DisableStdClog` methods."],["The `Instance` method provides access to the singleton instance of `LogSink` for application-wide log management."]]],[]]
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