From f0c3526a6cefacc581003e9e5d13c6df02b7613a Mon Sep 17 00:00:00 2001
From: "Tod D. Romo" <drtromo@gmail.com>
Date: Tue, 23 Jan 2024 13:16:50 -0500
Subject: [PATCH] Removing std::binary_function() since it is deprecated in
 c++17 and beyond

---
 Tools/fcontacts.cpp | 2 +-
 src/Atom.hpp        | 4 ++--
 src/AtomicGroup.hpp | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Tools/fcontacts.cpp b/Tools/fcontacts.cpp
index 8db5b27a1..509de40d4 100644
--- a/Tools/fcontacts.cpp
+++ b/Tools/fcontacts.cpp
@@ -174,7 +174,7 @@ class ToolOptions : public opts::OptionsPackage
 
 // Check for atom equality only through atomid...
 
-struct IdEquals : public binary_function<pAtom, pAtom, bool> 
+struct IdEquals
 {
     bool operator()(const pAtom& a, const pAtom& b) const 
         {
diff --git a/src/Atom.hpp b/src/Atom.hpp
index f68dbcdf6..8fa826076 100644
--- a/src/Atom.hpp
+++ b/src/Atom.hpp
@@ -282,7 +282,7 @@ namespace loos {
 
 #if !defined(SWIG)
   //! Compares two atoms based solely on name, id, resid, resname, and segid
-  struct AtomEquals : public std::binary_function<pAtom, pAtom, bool> {
+  struct AtomEquals {
     bool operator()(const pAtom& a, const pAtom& b) const;
   };
 
@@ -291,7 +291,7 @@ namespace loos {
   /**
    * The default distance threshold is 1e-3 Angstroms
    */
-  struct AtomCoordsEquals : public std::binary_function<pAtom, pAtom, bool> {
+  struct AtomCoordsEquals {
     AtomCoordsEquals(const double d) : threshold(d*d) { }
     AtomCoordsEquals() : threshold(1e-6) { }
 
diff --git a/src/AtomicGroup.hpp b/src/AtomicGroup.hpp
index 6d159e0e1..628ad67b9 100644
--- a/src/AtomicGroup.hpp
+++ b/src/AtomicGroup.hpp
@@ -256,7 +256,7 @@ namespace loos
      *
      * Or as another example, comparing only residue numbers...
      * \code
-     * struct ResidEquals : public std::binary_function<pAtom, pAtom, bool> {
+     * struct ResidEquals {
      *   bool operator()(const pAtom& a, const pAtom& b) { return(a.resid() == b.resid()); }
      * };
      *