Cleanup: Include Order

A typical include order in C++ is:

- "module header" (local header)
- "own headers" (WarpX)
- <close library headers> (AMReX)
- <other third party headers> (e.g. omp)
- <stdlib headers>

This avoids that a "forgotten include" will silently compile
in some compilers and crash in others (because it will crash
in all).

References:
- https://llvm.org/docs/CodingStandards.html#include-style
- https://include-what-you-use.org

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/Initialization/InjectorDensity.cpp b/Source/Initialization/InjectorDensity.cpp
index 54df4b14d..21af95f04 100644
--- a/Source/Initialization/InjectorDensity.cpp
+++ b/Source/Initialization/InjectorDensity.cpp
@@ -1,3 +1,4 @@
+#include <InjectorDensity.H>
 #include <PlasmaInjector.H>
 
 using namespace amrex;