changing so only iip=true copy

Author: Deltadahl

.gitignore

@@ -23,3 +23,10 @@ docs/site/
 # environment.
 Manifest.toml
 docs/src/assets/Project.toml
+
+.vscode
+TEST1.jl
+TEST2.jl
+TEST3.jl
+trustRegion copy.jl
+trustRegionHOLDER.jl

src/trustRegion.jl

@@ -309,8 +309,8 @@ function trust_region_step!(cache::TrustRegionCache)
     if r > alg.step_threshold
 
         # Take the step.
-        cache.u = copy(u_tmp)
-        cache.fu = copy(fu_new)
+        take_step!(cache)
+
         cache.loss = cache.loss_new
 
         # Update the trust region radius.
@@ -356,6 +356,16 @@ function dogleg!(cache::TrustRegionCache)
     cache.step_size = δsd + τ * N_sd
 end
 
+function take_step!(cache::TrustRegionCache{true})
+    cache.u = copy(cache.u_tmp)
+    cache.fu = copy(cache.fu_new)
+end
+
+function take_step!(cache::TrustRegionCache{false})
+    cache.u = cache.u_tmp
+    cache.fu = cache.fu_new
+end
+
 function SciMLBase.solve!(cache::TrustRegionCache)
     while !cache.force_stop && cache.iter < cache.maxiters &&
               cache.shrink_counter < cache.alg.max_shrink_times