[libsigcplusplus/variadic_mem_fun3: 30/148] Use C++14.

[Murray Cumming <murrayc src gnome org>]

commit ba8903793a70ecd041850573f1db3e642f60fcfe
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Jan 8 11:16:36 2016 +0100

    Use C++14.
    
    By using the MM_AX_CXX_COMPILE_STDCXX() m4 macro that I just
    added to mm-common.
    
    This lets us use std::integer_sequence (and std::index_sequence) with
    std::tuple.
    
    We probably also want to use decltype(auto) return types for template
    methods, as long as that doesn't slow down compile times.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d89b139..9c862e5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,7 +35,7 @@ MM_INIT_MODULE([sigc++-2.0])
 MM_CONFIG_DOCTOOL_DIR([docs])
 
 AC_PROG_CXX
-MM_AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
+MM_AX_CXX_COMPILE_STDCXX([14],[noext],[mandatory])
 
 AC_DISABLE_STATIC
 LT_INIT([win32-dll])