Make unexpected time type in BCLog::LogMsg() a compile-time error

Author: martinus

src/logging/timer.h

@@ -9,6 +9,7 @@
 #include <logging.h>
 #include <util/macros.h>
 #include <util/time.h>
+#include <util/types.h>
 
 #include <chrono>
 #include <string>
@@ -58,14 +59,14 @@ class Timer
             return strprintf("%s: %s", m_prefix, msg);
         }
 
-        if (std::is_same<TimeType, std::chrono::microseconds>::value) {
+        if constexpr (std::is_same<TimeType, std::chrono::microseconds>::value) {
             return strprintf("%s: %s (%iμs)", m_prefix, msg, end_time.count());
-        } else if (std::is_same<TimeType, std::chrono::milliseconds>::value) {
+        } else if constexpr (std::is_same<TimeType, std::chrono::milliseconds>::value) {
             return strprintf("%s: %s (%.2fms)", m_prefix, msg, end_time.count() * 0.001);
-        } else if (std::is_same<TimeType, std::chrono::seconds>::value) {
+        } else if constexpr (std::is_same<TimeType, std::chrono::seconds>::value) {
             return strprintf("%s: %s (%.2fs)", m_prefix, msg, end_time.count() * 0.000001);
         } else {
-            return "Error: unexpected time type";
+            static_assert(ALWAYS_FALSE<TimeType>, "Error: unexpected time type");
         }
     }
 
@@ -81,7 +82,6 @@ class Timer
     //! Forwarded on to LogPrint if specified - has the effect of only
     //! outputting the timing log when a particular debug= category is specified.
     const BCLog::LogFlags m_log_category{};
-
 };
 
 } // namespace BCLog

src/test/logging_tests.cpp

@@ -28,11 +28,6 @@ BOOST_AUTO_TEST_CASE(logging_timer)
     auto sec_timer = BCLog::Timer<std::chrono::seconds>("tests", "end_msg");
     SetMockTime(2);
     BOOST_CHECK_EQUAL(sec_timer.LogMsg("test secs"), "tests: test secs (1.00s)");
-
-    SetMockTime(1);
-    auto minute_timer = BCLog::Timer<std::chrono::minutes>("tests", "end_msg");
-    SetMockTime(2);
-    BOOST_CHECK_EQUAL(minute_timer.LogMsg("test minutes"), "Error: unexpected time type");
 }
 
 BOOST_AUTO_TEST_SUITE_END()