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use fold expression if C++17

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orignal 2020-02-28 14:05:51 -05:00
parent b02c9fb118
commit 1893127e84
1 changed files with 6 additions and 0 deletions
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6
libi2pd/Log.h
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@ -161,6 +161,7 @@ void LogPrint (std::stringstream& s, TValue&& arg) noexcept
s << std::forward<TValue>(arg); s << std::forward<TValue>(arg);
} }
#if (__cplusplus < 201703L) // below C++ 17
/** internal usage only -- folding args array to single string */ /** internal usage only -- folding args array to single string */
template<typename TValue, typename... TArgs> template<typename TValue, typename... TArgs>
void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
@ -168,6 +169,7 @@ void LogPrint (std::stringstream& s, TValue&& arg, TArgs&&... args) noexcept
LogPrint (s, std::forward<TValue>(arg)); LogPrint (s, std::forward<TValue>(arg));
LogPrint (s, std::forward<TArgs>(args)...); LogPrint (s, std::forward<TArgs>(args)...);
} }
#endif
/** /**
* @brief Create log message and send it to queue * @brief Create log message and send it to queue
@ -184,7 +186,11 @@ void LogPrint (LogLevel level, TArgs&&... args) noexcept
// fold message to single string // fold message to single string
std::stringstream ss(""); std::stringstream ss("");
#if (__cplusplus >= 201703L) // C++ 17 or higher
(LogPrint (ss, std::forward<TArgs>(args)), ...);
#else
LogPrint (ss, std::forward<TArgs>(args)...); LogPrint (ss, std::forward<TArgs>(args)...);
#endif
auto msg = std::make_shared<i2p::log::LogMsg>(level, std::time(nullptr), ss.str()); auto msg = std::make_shared<i2p::log::LogMsg>(level, std::time(nullptr), ss.str());
msg->tid = std::this_thread::get_id(); msg->tid = std::this_thread::get_id();