Add a swap_global_state, to allow the use of multiple

simultaneous library states.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/libstate.cpp b/src/libstate.cpp
index 581345f76..2b7636cdf 100644
--- a/src/libstate.cpp
+++ b/src/libstate.cpp
@@ -34,6 +34,13 @@ void set_global_state(Library_State* new_state)
    global_lib_state = new_state;
    }
 
+Library_State* swap_global_state(Library_State* new_state)
+   {
+   Library_State* old_state = global_lib_state;
+   global_lib_state = new_state;
+   return old_state;
+   }
+
 namespace {
 
 /*************************************************
@@ -342,3 +349,4 @@ Library_State::~Library_State()
    }
 
 }
+n