systemc: Use c++11 partial functions instead of boosts.

This creates a depenendency on c++11 which the headers otherwise avoid,
but gem5 itself already has a c++11 dependency and not a boost
dependency, and outside of having a local copy of boost (which
Accellera does) there isn't a good way to put the placeholder values
_1, _2, etc., into the custom sc_unnammed namespace.

Change-Id: I52ca4c1bc52bef6ff2c62e9f3c32af46f95244dc
Reviewed-on: https://gem5-review.googlesource.com/c/13193
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

2 files changed, 27 insertions, 29 deletions

diff --git a/src/systemc/core/sc_spawn.cc b/src/systemc/core/sc_spawn.cc
index 4618ea8c2..ed7f2f22b 100644
--- a/src/systemc/core/sc_spawn.cc
+++ b/src/systemc/core/sc_spawn.cc
@@ -224,18 +224,3 @@ sc_spawn_options::async_reset_signal_is(
 }
 
 } // namespace sc_core
-
-namespace sc_unnamed
-{
-
-ImplementationDefined _1;
-ImplementationDefined _2;
-ImplementationDefined _3;
-ImplementationDefined _4;
-ImplementationDefined _5;
-ImplementationDefined _6;
-ImplementationDefined _7;
-ImplementationDefined _8;
-ImplementationDefined _9;
-
-} // namespace sc_unnamed
diff --git a/src/systemc/ext/core/sc_spawn.hh b/src/systemc/ext/core/sc_spawn.hh
index 50378e23d..a37e48206 100644
--- a/src/systemc/ext/core/sc_spawn.hh
+++ b/src/systemc/ext/core/sc_spawn.hh
@@ -30,6 +30,7 @@
 #ifndef __SYSTEMC_EXT_CORE_SC_SPAWN_HH__
 #define __SYSTEMC_EXT_CORE_SC_SPAWN_HH__
 
+#include <functional>
 #include <vector>
 
 #include "sc_join.hh"
@@ -173,10 +174,6 @@ sc_spawn(typename T::result_type *r_p, T object, const char *name_p=nullptr,
     return sc_process_handle() = p;
 }
 
-#define sc_bind boost::bind
-#define sc_ref(r) boost::ref(r)
-#define sc_cref(r) boost::cref(r)
-
 #define SC_FORK \
 { \
     ::sc_core::sc_process_handle forkees[] = {
@@ -198,22 +195,38 @@ sc_spawn(typename T::result_type *r_p, T object, const char *name_p=nullptr,
     join.wait_clocked(); \
 }
 
+// This avoids boost introduces a dependency on c++11. If that's a problem,
+// we could imitate Accellera and pick which one to use on the fly.
+
+template <typename F, typename... Args>
+auto sc_bind(F &&f, Args && ...args) ->
+    decltype(std::bind(std::forward<F>(f), std::forward<Args>(args)...))
+{
+    return std::bind(std::forward<F>(f), std::forward<Args>(args)...);
+}
+
+template <typename T>
+auto sc_ref(T &&v) -> decltype(std::ref(std::forward<T>(v)))
+{
+    return std::ref(std::forward<T>(v));
+}
+
+template <typename T>
+auto sc_cref(T &&v) -> decltype(std::cref(std::forward<T>(v)))
+{
+    return std::cref(std::forward<T>(v));
+}
 
 } // namespace sc_core
 
+using sc_core::sc_bind;
+using sc_core::sc_ref;
+using sc_core::sc_cref;
+
 namespace sc_unnamed
 {
 
-typedef int ImplementationDefined;
-extern ImplementationDefined _1;
-extern ImplementationDefined _2;
-extern ImplementationDefined _3;
-extern ImplementationDefined _4;
-extern ImplementationDefined _5;
-extern ImplementationDefined _6;
-extern ImplementationDefined _7;
-extern ImplementationDefined _8;
-extern ImplementationDefined _9;
+using namespace std::placeholders;
 
 } // namespace sc_unnamed