[v3] N3669

[Paolo Carlini]

Hi,

I went through the items noticed by Nico in the paper and voted to the 
wp, and we are missing only the following, I think we can do the change now.

Tested x86_64-linux.

Thanks,
Paolo.

/////////////////////////
2013-04-22  Paolo Carlini  <paolo.carl...@oracle.com>

        N3669
        * include/std/complex (complex<float>::real, complex<float>::imag,
        complex<double>::real, complex<double>::imag,
        complex<long double>::real, complex<long double>::imag): Declare
        as const member functions.
        * include/std/type_traits (integral_constant<>::operator value_type):
        Likewise.
Index: include/std/complex
===================================================================
--- include/std/complex (revision 198124)
+++ include/std/complex (working copy)
@@ -1066,11 +1066,11 @@
       // DR 387. std::complex over-encapsulated.
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr float 
-      real() { return __real__ _M_value; }
+      real() const { return __real__ _M_value; }
 
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr float 
-      imag() { return __imag__ _M_value; }
+      imag() const { return __imag__ _M_value; }
 #else
       float& 
       real() { return __real__ _M_value; }
@@ -1217,11 +1217,11 @@
       // DR 387. std::complex over-encapsulated.
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr double 
-      real() { return __real__ _M_value; }
+      real() const { return __real__ _M_value; }
 
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr double 
-      imag() { return __imag__ _M_value; }
+      imag() const { return __imag__ _M_value; }
 #else
       double& 
       real() { return __real__ _M_value; }
@@ -1369,11 +1369,11 @@
       // DR 387. std::complex over-encapsulated.
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr long double 
-      real() { return __real__ _M_value; }
+      real() const { return __real__ _M_value; }
 
       __attribute ((__abi_tag__ ("cxx11")))
       constexpr long double 
-      imag() { return __imag__ _M_value; }
+      imag() const { return __imag__ _M_value; }
 #else
       long double& 
       real() { return __real__ _M_value; }
Index: include/std/type_traits
===================================================================
--- include/std/type_traits     (revision 198124)
+++ include/std/type_traits     (working copy)
@@ -59,7 +59,7 @@
       static constexpr _Tp                  value = __v;
       typedef _Tp                           value_type;
       typedef integral_constant<_Tp, __v>   type;
-      constexpr operator value_type() { return value; }
+      constexpr operator value_type() const { return value; }
     };
   
   template<typename _Tp, _Tp __v>