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From e91fb0618ce0a5d42f239d0fca602544858f0819 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 16 Aug 2022 08:44:18 -0700
Subject: [PATCH] Remove using std::binary_function

std::binary_function and std::unary_function are deprecated since c++11
and removed in c++17, therefore remove it and use lambda functions to get same
functionality implemented.

Upstream-Status: Submitted [https://salsa.debian.org/apt-team/apt/-/merge_requests/253]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 ftparchive/apt-ftparchive.cc | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/ftparchive/apt-ftparchive.cc b/ftparchive/apt-ftparchive.cc
index 0f6587281..0a253b12b 100644
--- a/ftparchive/apt-ftparchive.cc
+++ b/ftparchive/apt-ftparchive.cc
@@ -48,6 +48,11 @@
 using namespace std;
 unsigned Quiet = 0;
 
+auto ContentsCompare = [](const auto &a, const auto &b) { return a.ContentsMTime < b.ContentsMTime; };
+auto DBCompare = [](const auto &a, const auto &b) { return a.BinCacheDB < b.BinCacheDB; };
+auto SrcDBCompare = [](const auto &a, const auto &b) { return a.SrcCacheDB < b.SrcCacheDB; };
+
+
 static struct timeval GetTimevalFromSteadyClock()			/*{{{*/
 {
    auto const Time = std::chrono::steady_clock::now().time_since_epoch();
@@ -116,24 +121,6 @@ struct PackageMap
    bool SrcDone;
    time_t ContentsMTime;
    
-   struct ContentsCompare
-   {
-      inline bool operator() (const PackageMap &x,const PackageMap &y)
-      {return x.ContentsMTime < y.ContentsMTime;};
-   };
-    
-   struct DBCompare
-   {
-      inline bool operator() (const PackageMap &x,const PackageMap &y)
-      {return x.BinCacheDB < y.BinCacheDB;};
-   };  
-
-   struct SrcDBCompare
-   {
-      inline bool operator() (const PackageMap &x,const PackageMap &y)
-      {return x.SrcCacheDB < y.SrcCacheDB;};
-   };
-   
    void GetGeneral(Configuration &Setup,Configuration &Block);
    bool GenPackages(Configuration &Setup,struct CacheDB::Stats &Stats);
    bool GenSources(Configuration &Setup,struct CacheDB::Stats &Stats);
@@ -869,7 +856,7 @@ static bool DoGenerateContents(Configuration &Setup,
       else
 	 I->ContentsMTime = A.st_mtime;
    }
-   stable_sort(PkgList.begin(),PkgList.end(),PackageMap::ContentsCompare());
+   stable_sort(PkgList.begin(),PkgList.end(),ContentsCompare);
    
    /* Now for Contents.. The process here is to do a make-like dependency
       check. Each contents file is verified to be newer than the package files
@@ -941,8 +928,8 @@ static bool Generate(CommandLine &CmdL)
    LoadBinDir(PkgList,Setup);
 
    // Sort by cache DB to improve IO locality.
-   stable_sort(PkgList.begin(),PkgList.end(),PackageMap::DBCompare());
-   stable_sort(PkgList.begin(),PkgList.end(),PackageMap::SrcDBCompare());
+   stable_sort(PkgList.begin(),PkgList.end(),DBCompare);
+   stable_sort(PkgList.begin(),PkgList.end(),SrcDBCompare);
 
    // Generate packages
    if (_config->FindB("APT::FTPArchive::ContentsOnly", false) == false)
@@ -993,8 +980,8 @@ static bool Clean(CommandLine &CmdL)
    LoadBinDir(PkgList,Setup);
 
    // Sort by cache DB to improve IO locality.
-   stable_sort(PkgList.begin(),PkgList.end(),PackageMap::DBCompare());
-   stable_sort(PkgList.begin(),PkgList.end(),PackageMap::SrcDBCompare());
+   stable_sort(PkgList.begin(),PkgList.end(),DBCompare);
+   stable_sort(PkgList.begin(),PkgList.end(),SrcDBCompare);
 
    string CacheDir = Setup.FindDir("Dir::CacheDir");