Use the empty method to check for emptiness instead of comparing to an empty object

src/commands/CmdChart.cpp

@@ -241,7 +241,7 @@ static void determineHourRange (
     last_hour = 23;
 
     // If there is no data, show the whole day.
-    if (tracked.size ())
+    if (! tracked.empty ())
     {
       // Get the extreme time range for the filtered data.
       first_hour = 23;
@@ -562,7 +562,7 @@ static void renderInterval (
 
     for (auto& tag : track.tags ())
     {
-      if (label != "")
+      if (! label.empty ())
         label += ' ';
 
       label += tag;

src/commands/CmdConfig.cpp

@@ -126,8 +126,7 @@ static bool setConfigVariable (Database& database, const Rules& rules, std::stri
                            value)))
       {
         // Add blank line required by rules.
-        if (lines.size () &&
-            lines.back () != "")
+        if (lines.empty () || lines.back ().empty ())
           lines.push_back ("");
 
         // Add new line.
@@ -150,8 +149,7 @@ static bool setConfigVariable (Database& database, const Rules& rules, std::stri
       //      new leaf/value properly. But that's non-trivial.
 
       // Add blank line required by rules.
-      if (lines.size () &&
-          lines.back () != "")
+      if (lines.empty () || lines.back ().empty ())
         lines.push_back ("");
 
       // Add new line.
@@ -272,7 +270,7 @@ int CmdConfig (
   //   task config name value    # set name to value
   //   task config name ""       # set name to blank
   //   task config name          # remove name
-  if (words.size ())
+  if (! words.empty ())
   {
     bool confirmation = rules.getBoolean ("confirmation");
     std::string name = words[0];
@@ -290,7 +288,7 @@ int CmdConfig (
       }
     }
 
-    if (name != "")
+    if (! name.empty ())
     {
       bool change = false;
 

src/commands/CmdDiagnostics.cpp

@@ -197,7 +197,7 @@ int CmdDiagnostics (
       << "       Location: " << describeFile (extDir) << '\n';
 
   auto exts = extensions.all ();
-  if (exts.size ())
+  if (! exts.empty ())
   {
     unsigned int longest = 0;
     for (auto& e : exts)

src/commands/CmdHelp.cpp

@@ -67,7 +67,7 @@ int CmdHelpUsage (const Extensions& extensions)
             << "       timew week [<interval>] [<tag> ...]\n"
             << '\n';
 
-  if (extensions.all ().size ())
+  if (!extensions.all ().empty ())
   {
     std::cout << "Extensions (extensions do not provide help):\n";
 
@@ -120,7 +120,8 @@ int CmdHelp (
   const Extensions& extensions)
 {
   auto words = cli.getWords ();
-  if (words.size ())
+
+  if (! words.empty ())
   {
     // Ruler                 1         2         3         4         5         6         7         8
     //              12345678901234567890123456789012345678901234567890123456789012345678901234567890

src/commands/CmdReport.cpp

@@ -47,7 +47,7 @@ static std::string findExtension (
   std::vector <std::string> matches;
   autoComplete (partial, options, matches);
 
-  if (matches.size () == 0)
+  if (matches.empty ())
     throw format ("The report '{1}' is not recognized.", partial);
 
   if (matches.size () > 1)
@@ -75,7 +75,7 @@ int CmdReport (
     if (arg.hasTag ("EXT"))
       script = findExtension (extensions, arg.attribute ("canonical"));
 
-  if (script == "")
+  if (script.empty ())
     throw std::string ("Specify which report to run.");
 
   // Compose Header info.

src/commands/CmdStop.cpp

@@ -84,7 +84,7 @@ int CmdStop (
 
   // If tags are specified, but are not a full set of tags, remove them
   // before closing the interval.
-  if (filter.tags ().size () &&
+  if (! filter.tags ().empty () &&
       setIntersect (filter.tags (), latest.tags ()).size () != latest.tags ().size ())
   {
     for (auto& tag : filter.tags ())
@@ -95,7 +95,7 @@ int CmdStop (
   }
 
   // Open a new interval with remaining tags, if any.
-  if (filter.tags ().size () &&
+  if (! filter.tags ().empty () &&
       modified.tags ().size () != latest.tags ().size ())
   {
     modified.range.start = modified.range.end;

src/commands/CmdSummary.cpp

@@ -65,7 +65,7 @@ int CmdSummary (
           std::cout << " - " << filter.range.end.toISOLocalExtended ();
       }
 
-      if (filter.tags ().size ())
+      if (! filter.tags ().empty ())
       {
         std::cout << " tagged with " << joinQuotedIfNeeded (", ", filter.tags ());
       }

src/commands/CmdTags.cpp

@@ -48,7 +48,7 @@ int CmdTags (
       tags.insert (tag);
 
   // Shows all tags.
-  if (tags.size ())
+  if (! tags.empty ())
   {
     Table t;
     t.width (1024);