std::string_view can be used in map and unordered map

This avoids some unecessary dynamic allocations.
Also applies some review advice.

apps/openmw/mwmechanics/aifollow.cpp

@@ -36,7 +36,6 @@ namespace MWMechanics
         , mX(x)
         , mY(y)
         , mZ(z)
-        , mCellId("")
         , mActive(false)
         , mFollowIndex(mFollowIndexCounter++)
     {
@@ -67,7 +66,6 @@ namespace MWMechanics
         , mX(0)
         , mY(0)
         , mZ(0)
-        , mCellId("")
         , mActive(false)
         , mFollowIndex(mFollowIndexCounter++)
     {
@@ -170,7 +168,7 @@ namespace MWMechanics
             {
                 if (actor.getCell()->isExterior()) // Outside?
                 {
-                    if (mCellId == "") // No cell to travel to
+                    if (mCellId.empty()) // No cell to travel to
                     {
                         mRemainingDuration = mDuration;
                         return true;

apps/openmw/mwworld/store.cpp

@@ -515,14 +515,13 @@ namespace MWWorld
     }
     const ESM::Cell* Store<ESM::Cell>::search(std::string_view name) const
     {
-        const std::string nameString = std::string(name);
+        DynamicInt::const_iterator it = mInt.find(name);
-        DynamicInt::const_iterator it = mInt.find(nameString);
         if (it != mInt.end())
         {
             return &(it->second);
         }
 
-        DynamicInt::const_iterator dit = mDynamicInt.find(nameString);
+        DynamicInt::const_iterator dit = mDynamicInt.find(name);
         if (dit != mDynamicInt.end())
         {
             return &dit->second;
@@ -815,8 +814,7 @@ namespace MWWorld
     }
     bool Store<ESM::Cell>::erase(std::string_view name)
     {
-        const std::string nameString = std::string(name);
+        auto it = mDynamicInt.find(name);
-        auto it = mDynamicInt.find(nameString);
 
         if (it == mDynamicInt.end())
         {

apps/openmw/mwworld/store.hpp

@@ -332,7 +332,8 @@ namespace MWWorld
             }
         };
 
-        typedef std::unordered_map<std::string, ESM::Cell, Misc::StringUtils::CiHash> DynamicInt;
+        typedef std::unordered_map<std::string, ESM::Cell, Misc::StringUtils::CiHash, Misc::StringUtils::CiEqual>
+            DynamicInt;
 
         typedef std::map<std::pair<int, int>, ESM::Cell, DynamicExtCmp> DynamicExt;
 

apps/openmw/mwworld/worldimp.cpp

@@ -1399,7 +1399,7 @@ namespace MWWorld
             esmPos.pos[0] = traced.x();
             esmPos.pos[1] = traced.y();
             esmPos.pos[2] = traced.z();
-            std::string_view cell = "";
+            std::string_view cell;
             if (!actor.getCell()->isExterior())
                 cell = actor.getCell()->getCell()->mName;
             MWWorld::ActionTeleport(cell, esmPos, false).execute(actor);

apps/openmw/mwworld/worldmodel.cpp

@@ -64,7 +64,7 @@ MWWorld::CellStore* MWWorld::WorldModel::getCellStore(const ESM::Cell* cell)
 {
     if (cell->mData.mFlags & ESM::Cell::Interior)
     {
-        auto result = mInteriors.find(std::string(cell->mName));
+        auto result = mInteriors.find(cell->mName);
 
         if (result == mInteriors.end())
             result = mInteriors.emplace(cell->mName, CellStore(cell, mStore, mReaders)).first;
@@ -198,7 +198,7 @@ MWWorld::CellStore* MWWorld::WorldModel::getExterior(int x, int y)
 
 MWWorld::CellStore* MWWorld::WorldModel::getInterior(std::string_view name)
 {
-    auto result = mInteriors.find(std::string(name));
+    auto result = mInteriors.find(name);
 
     if (result == mInteriors.end())
     {

apps/openmw_test_suite/detournavigator/tilecachedrecastmeshmanager.cpp

@@ -175,7 +175,7 @@ namespace
             .mEnd = TilePosition(1, 1),
         };
         manager.setRange(range, nullptr);
-        manager.setWorldspace(mWorldspace, nullptr);
+        manager.setWorldspace("worldspace", nullptr);
 
         const btBoxShape boxShape(btVector3(20, 20, 100));
         const btTransform transform(

components/misc/strings/algorithm.hpp

@@ -94,6 +94,8 @@ namespace Misc::StringUtils
 
     struct CiComp
     {
+        using is_transparent = void;
+
         bool operator()(std::string_view left, std::string_view right) const { return ciLess(left, right); }
     };