From eeb2c53b560f76a96e1e05b366c8c2828df29286 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaakko=20J=C3=A4rvi?= <jarvi@cs.tamu.edu>
Date: Tue, 14 May 2002 16:59:33 +0000
Subject: [PATCH] added dummy uses of arguments to prevent unused argument
 errors

[SVN r13860]
---
 .../boost/lambda/detail/lambda_functor_base.hpp  |  8 ++++++--
 include/boost/lambda/detail/lambda_functors.hpp  |  7 ++++---
 include/boost/lambda/detail/lambda_fwd.hpp       | 16 ++++++++++++++++
 include/boost/lambda/detail/select_functions.hpp |  4 ++--
 4 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/include/boost/lambda/detail/lambda_functor_base.hpp b/include/boost/lambda/detail/lambda_functor_base.hpp
index 7f534a1..01ed220 100644
--- a/include/boost/lambda/detail/lambda_functor_base.hpp
+++ b/include/boost/lambda/detail/lambda_functor_base.hpp
@@ -44,7 +44,7 @@ public:
   struct sig { typedef element_t type; };
 
   template<class RET, CALL_TEMPLATE_ARGS>
-  RET call(CALL_FORMAL_ARGS) const { return elem; }
+  RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return elem; }
 };
 
 template <class T> 
@@ -293,6 +293,7 @@ public:
   template<class RET, CALL_TEMPLATE_ARGS>
   RET call(CALL_FORMAL_ARGS) const 
   {
+     CALL_USE_ARGS;
      return boost::tuples::get<0>(args);
   }
 
@@ -311,7 +312,9 @@ class lambda_functor_base<do_nothing_action, Args> {
 public:
   explicit lambda_functor_base(const Args& a) {}
 
-  template<class RET, CALL_TEMPLATE_ARGS> RET call(CALL_FORMAL_ARGS) const {}
+  template<class RET, CALL_TEMPLATE_ARGS> RET call(CALL_FORMAL_ARGS) const {
+    CALL_USE_ARGS;
+  }
 
   template<class SigArgs> struct sig { typedef void type; };
 };  
@@ -345,6 +348,7 @@ public:
   
   template<class RET, CALL_TEMPLATE_ARGS>  
   RET call(CALL_FORMAL_ARGS) const {  
+    CALL_USE_ARGS;
     return Act::template apply<RET>();
   }
 };
diff --git a/include/boost/lambda/detail/lambda_functors.hpp b/include/boost/lambda/detail/lambda_functors.hpp
index b34ccb7..4f9e851 100644
--- a/include/boost/lambda/detail/lambda_functors.hpp
+++ b/include/boost/lambda/detail/lambda_functors.hpp
@@ -63,6 +63,7 @@ template<> struct placeholder<FIRST> {
   template<class RET, CALL_TEMPLATE_ARGS> 
   RET call(CALL_FORMAL_ARGS) const { 
     BOOST_STATIC_ASSERT(boost::is_reference<RET>::value); 
+    CALL_USE_ARGS; // does nothing, prevents warnings for unused args
     return a; 
   }
 };
@@ -74,7 +75,7 @@ template<> struct placeholder<SECOND> {
   };
 
   template<class RET, CALL_TEMPLATE_ARGS> 
-  RET call(CALL_FORMAL_ARGS) const { return b; }
+  RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return b; }
 };
 
 template<> struct placeholder<THIRD> {
@@ -84,7 +85,7 @@ template<> struct placeholder<THIRD> {
   };
 
   template<class RET, CALL_TEMPLATE_ARGS> 
-  RET call(CALL_FORMAL_ARGS) const { return c; }
+  RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return c; }
 };
 
 template<> struct placeholder<EXCEPTION> {
@@ -94,7 +95,7 @@ template<> struct placeholder<EXCEPTION> {
   };
 
   template<class RET, CALL_TEMPLATE_ARGS> 
-  RET call(CALL_FORMAL_ARGS) const { return env; }
+  RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return env; }
 };
    
 typedef const lambda_functor<placeholder<FIRST> >  placeholder1_type;
diff --git a/include/boost/lambda/detail/lambda_fwd.hpp b/include/boost/lambda/detail/lambda_fwd.hpp
index 0130a52..8f06a89 100644
--- a/include/boost/lambda/detail/lambda_fwd.hpp
+++ b/include/boost/lambda/detail/lambda_fwd.hpp
@@ -59,5 +59,21 @@ class lambda_functor_base;
 #define CALL_REFERENCE_TYPES A&, B&, C&, Env&
 #define CALL_PLAIN_TYPES A, B, C, Env
 
+namespace boost {
+namespace lambda {
+namespace detail {
+
+template<class A1, class A2, class A3, class A4>
+void do_nothing(A1&, A2&, A3&, A4&) {}
+
+} // detail
+} // lambda
+} // boost
+
+// prevent the warnings from unused argumetns
+#define CALL_USE_ARGS \
+::boost::lambda::detail::do_nothing(a, b, c, env)
+
+
 
 #endif
diff --git a/include/boost/lambda/detail/select_functions.hpp b/include/boost/lambda/detail/select_functions.hpp
index 0f7f33a..10e047d 100644
--- a/include/boost/lambda/detail/select_functions.hpp
+++ b/include/boost/lambda/detail/select_functions.hpp
@@ -24,7 +24,7 @@ namespace detail {
 
 // select functions -------------------------------
 template<class Any, CALL_TEMPLATE_ARGS>
-inline Any& select(Any& any, CALL_FORMAL_ARGS) { return any; }
+inline Any& select(Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; }
 
 
 template<class Arg, CALL_TEMPLATE_ARGS>
@@ -57,7 +57,7 @@ template<class RET> struct r_select {
 // Any == RET
   template<class Any, CALL_TEMPLATE_ARGS>
   static 
-  inline RET go (Any& any, CALL_FORMAL_ARGS) { return any; }
+  inline RET go (Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; }
 
 
   template<class Arg, CALL_TEMPLATE_ARGS>