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, 2 insertions, 0 deletions

diff --git a/src/PJ_sch.cpp b/src/PJ_sch.cpp
index 4a0b1fb8..23b6c4c2 100644
--- a/src/PJ_sch.cpp
+++ b/src/PJ_sch.cpp
@@ -39,6 +39,7 @@
 #include "projects.h"
 #include "geocent.h"
 
+namespace { // anonymous namespace
 struct pj_opaque {
     double plat; /*Peg Latitude */
     double plon; /*Peg Longitude*/
@@ -50,6 +51,7 @@ struct pj_opaque {
     GeocentricInfo sph;
     GeocentricInfo elp_0;
 };
+} // anonymous namespace
 
 PROJ_HEAD(sch, "Spherical Cross-track Height") "\n\tMisc\n\tplat_0= plon_0= phdg_0= [h_0=]";