[sigc] [PATCH] Fix for warnings when -W -Wall is used

[Andris Pavenis <pavenis latnet lv>]

Use of GCC command line options '-W -Wall' causes warnings from
libsigc++ header files about unused parameters (for 
operator()) in several places when recent GCC versions
like gcc-4.0.0 is being used.

This is a small nuisance in one uses -W -Wall -Werror to get rid 
of warnings.

Included patch (against libsigc++-2.0.13) fixes this problem (at least 
all such warnings, which I have encountered).

Andris

2005-06-11  Andris Pavenis <pavenis latnet lv>

 *sigc++/adaptors/lambda/macros/base.h.m4:
 *sigc++/adaptors/lambda/macros/select.h.m4
 * sigc++/adaptors/macros/hide.h.m4: Specify only a type (not a
 parameter name) for unused member function parameters

diff -ur3 libsigc++-2.0.13.orig/sigc++/adaptors/lambda/macros/base.h.m4 libsigc++-2.0.13/sigc++/adaptors/lambda/macros/base.h.m4
--- libsigc++-2.0.13.orig/sigc++/adaptors/lambda/macros/base.h.m4	2005-05-10 13:39:56.000000000 +0000
+++ libsigc++-2.0.13/sigc++/adaptors/lambda/macros/base.h.m4	2005-06-11 15:45:32.000000000 +0000
@@ -37,12 +37,12 @@
 ])dnl
 define([LAMBDA_DO_VALUE],[dnl
   template <LOOP(class T_arg%1, $1)>
-  result_type operator ()(LOOP(T_arg%1 _A_%1, $1)) const 
+  result_type operator ()(LOOP(T_arg%1, $1)) const 
     { return value_; }
 
   #ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
   template <LOOP(class T_arg%1, $1)>
-  result_type sun_forte_workaround(LOOP(T_arg%1 _A_%1, $1)) const
+  result_type sun_forte_workaround(LOOP(T_arg%1, $1)) const
     { return value_; }
   #endif //SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
 
diff -ur3 libsigc++-2.0.13.orig/sigc++/adaptors/lambda/macros/select.h.m4 libsigc++-2.0.13/sigc++/adaptors/lambda/macros/select.h.m4
--- libsigc++-2.0.13.orig/sigc++/adaptors/lambda/macros/select.h.m4	2004-08-03 17:58:20.000000000 +0000
+++ libsigc++-2.0.13/sigc++/adaptors/lambda/macros/select.h.m4	2005-06-11 15:45:32.000000000 +0000
@@ -21,12 +21,13 @@
 dnl Macros to make select arguments
 define([LAMBDA_SELECT_DO],[dnl
   template <LOOP(class T_arg%1, $2)>
-  T_arg$1 operator ()(LOOP(T_arg%1 _A_%1, $2)) const { return _A_$1; }
+dnl T_arg$1 operator ()(LOOP(T_arg%1 _A_%1, $2)) const { return _A_$1; }
+  T_arg$1 operator ()(LIST(FOR(1,eval($1-1),[T_arg%1,]),T_arg$1 _A_$1,FOR(eval($1+1),$2,[T_arg%1,]))) const { return _A_$1; }
 
   #ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
   template <LOOP(class T_arg%1, $2)>
   //Does not work: T_arg$1 sun_forte_workaround(LOOP(T_arg%1 _A_%1, $2)) const { return operator()( LOOP(_A_%1, $2) ); }
-  T_arg$1 sun_forte_workaround(LOOP(T_arg%1 _A_%1, $2)) const { return _A_$1; }
+  T_arg$1 sun_forte_workaround(LIST(FOR(1,eval($1-1),[T_arg%1,]),T_arg$1 _A_$1,FOR(eval($1+1),$2,[T_arg%1,]))) const { return _A_$1; }
   #endif
   
 ])
diff -ur3 libsigc++-2.0.13.orig/sigc++/adaptors/macros/hide.h.m4 libsigc++-2.0.13/sigc++/adaptors/macros/hide.h.m4
--- libsigc++-2.0.13.orig/sigc++/adaptors/macros/hide.h.m4	2005-02-01 11:02:20.000000000 +0000
+++ libsigc++-2.0.13/sigc++/adaptors/macros/hide.h.m4	2005-06-11 15:45:32.000000000 +0000
@@ -36,7 +36,7 @@
    */
   template <class T_arg1>
   typename deduce_result_type<T_arg1>::type
-  operator()(T_arg1 _A_a1)
+  operator()(T_arg1)
     { return this->functor_(); }
 
   #ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
@@ -55,14 +55,14 @@
    */
   template <LOOP([class T_arg%1], $2)>
   typename deduce_result_type<LOOP(T_arg%1, $2)>::type
-  operator()(LOOP(T_arg%1 _A_a%1, $2))
+  operator()(LOOP(T_arg%1 _A_a%1, eval($2-1)), T_arg$2)
     { return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($2-1),[_P_(T_arg%1),]))>
         (LIST(FOR(1,eval($2-1),[_A_a%1,]))); }
 
   #ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
   template <LOOP([class T_arg%1], $2)>
   typename deduce_result_type<LOOP(T_arg%1, $2)>::type
-  sun_forte_workaround(LOOP(T_arg%1 _A_a%1, $2))
+  sun_forte_workaround(LOOP(T_arg%1 _A_a%1, eval($2-1)), T_arg$2)
     { return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($2-1),[_P_(T_arg%1),]))>
         (LIST(FOR(1,eval($2-1),[_A_a%1,]))); }
   #endif
@@ -78,14 +78,14 @@
    */
   template <LOOP([class T_arg%1], $2)>
   typename deduce_result_type<LOOP(T_arg%1, $2)>::type
-  operator()(LOOP(T_arg%1 _A_a%1, $2))
+  operator()(LIST(FOR(1,eval($1-1),[T_arg%1 _A_a%1,]),T_arg$1,FOR(eval($1+1),$2,[T_arg%1 _A_a%1,])))
     { return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($1-1),[_P_(T_arg%1),]),FOR(eval($1+1), $2,[_P_(T_arg%1),]))>
         (LIST(FOR(1,eval($1-1),[_A_a%1,]),FOR(eval($1+1),$2,[_A_a%1,]))); }
 
   #ifndef SIGC_TEMPLATE_SPECIALIZATION_OPERATOR_OVERLOAD
   template <LOOP([class T_arg%1], $2)>
   typename deduce_result_type<LOOP(T_arg%1, $2)>::type
-  sun_forte_workaround(LOOP(T_arg%1 _A_a%1, $2))
+  sun_forte_workaround(LIST(FOR(1,eval($1-1),[T_arg%1 _A_a%1,]),T_arg$1,FOR(eval($1+1),$2,[T_arg%1 _A_a%1,]))
     { return this->functor_.SIGC_WORKAROUND_OPERATOR_PARENTHESES<LIST(FOR(1,eval($1-1),[_P_(T_arg%1),]),FOR(eval($1+1), $2,[_P_(T_arg%1),]))>
         (LIST(FOR(1,eval($1-1),[_A_a%1,]),FOR(eval($1+1),$2,[_A_a%1,]))); }
   #endif