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Log: don't construct std::ostringstream for no-op messages

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This commit removes the existing m_IsNoOp bool and instead wraps the m_Buffer
std::ostringstream into std::optional. Functionally, this is pretty much the
same, with the exception that std::ostringstream is no longer constructed for
messages that will be discarded later.
This commit is contained in:
Julian Brost 2025-07-14 13:37:36 +02:00
parent ef0bc8366c
commit 8d74cc631c
2 changed files with 19 additions and 11 deletions
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18
lib/base/logger.cpp
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@ -247,21 +247,25 @@ void Logger::UpdateMinLogSeverity()
Log::Log(LogSeverity severity, String facility, const String& message) Log::Log(LogSeverity severity, String facility, const String& message)
: Log(severity, std::move(facility)) : Log(severity, std::move(facility))
{ {
if (!m_IsNoOp) { *this << message;
m_Buffer << message;
}
} }
Log::Log(LogSeverity severity, String facility) Log::Log(LogSeverity severity, String facility)
: m_Severity(severity), m_Facility(std::move(facility)), m_IsNoOp(severity < Logger::GetMinLogSeverity()) {
{ } // Only fully initialize the object if it's actually going to be logged.
if (severity >= Logger::GetMinLogSeverity()) {
m_Severity = severity;
m_Facility = std::move(facility);
m_Buffer.emplace();
}
}
/** /**
* Writes the message to the application's log. * Writes the message to the application's log.
*/ */
Log::~Log() Log::~Log()
{ {
if (m_IsNoOp) { if (!m_Buffer) {
return; return;
} }
@ -271,7 +275,7 @@ Log::~Log()
entry.Facility = m_Facility; entry.Facility = m_Facility;
{ {
auto msg (m_Buffer.str()); auto msg (m_Buffer->str());
msg.erase(msg.find_last_not_of("\n") + 1u); msg.erase(msg.find_last_not_of("\n") + 1u);
entry.Message = std::move(msg); entry.Message = std::move(msg);

12
lib/base/logger.hpp
View File

@ -6,6 +6,7 @@
#include "base/atomic.hpp" #include "base/atomic.hpp"
#include "base/i2-base.hpp" #include "base/i2-base.hpp"
#include "base/logger-ti.hpp" #include "base/logger-ti.hpp"
#include <optional>
#include <set> #include <set>
#include <sstream> #include <sstream>
@ -121,8 +122,8 @@ public:
template<typename T> template<typename T>
Log& operator<<(T&& val) Log& operator<<(T&& val)
{ {
if (!m_IsNoOp) { if (m_Buffer) {
m_Buffer << std::forward<T>(val); *m_Buffer << std::forward<T>(val);
} }
return *this; return *this;
@ -131,8 +132,11 @@ public:
private: private:
LogSeverity m_Severity; LogSeverity m_Severity;
String m_Facility; String m_Facility;
std::ostringstream m_Buffer; /**
bool m_IsNoOp; * Stream for incrementally generating the log message. If the message will be discarded as it's level currently
* isn't logged, it will be empty as the stream doesn't need to be initialized in this case.
*/
std::optional<std::ostringstream> m_Buffer;
}; };
extern template Log& Log::operator<<(const Value&); extern template Log& Log::operator<<(const Value&);