cpp conversion: fix One-Definition-Rule violations

Defining struct pj_opaque with different definitions is a violation
of the C++ One-Definition-Rule. When using link-time optimizations, this
could break badly.
The solution adopted here is to wrap those structures into a C++
anonymous namespace so they are considered different

1 files changed, 4 insertions, 0 deletions

diff --git a/src/PJ_nsper.cpp b/src/PJ_nsper.cpp
index e6ecb852..beace3d9 100644
--- a/src/PJ_nsper.cpp
+++ b/src/PJ_nsper.cpp
@@ -4,13 +4,16 @@
 #include "projects.h"
 #include "proj_math.h"
 
+namespace { // anonymous namespace
 enum Mode {
     N_POLE = 0,
     S_POLE = 1,
     EQUIT  = 2,
     OBLIQ  = 3
 };
+} // anonymous namespace
 
+namespace { // anonymous namespace
 struct pj_opaque {
     double  height;
     double  sinph0;
@@ -27,6 +30,7 @@ struct pj_opaque {
     enum Mode mode;
     int     tilt;
 };
+} // anonymous namespace
 
 PROJ_HEAD(nsper, "Near-sided perspective") "\n\tAzi, Sph\n\th=";
 PROJ_HEAD(tpers, "Tilted perspective") "\n\tAzi, Sph\n\ttilt= azi= h=";