From 2d0fcd9a4d1646edabf9e62ec73d346aed352819 Mon Sep 17 00:00:00 2001
From: DeckerSU <deckersu@protonmail.com>
Date: Sat, 1 Jul 2023 18:50:02 +0200
Subject: [PATCH] build: fix the comparsion object error with gcc 11

This commit fixes the error below when trying to compile with GCC 11.3.0.

```
/usr/include/c++/12/bits/stl_tree.h:770:15: error: static assertion failed: comparison object must be invocable as const
  770 |               is_invocable_v<const _Compare&, const _Key&, const _Key&>,
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~IteratorComparator::operator()
```
---
 src/main.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index cd3d63c25e0f..7b3baa77e7da 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -94,7 +94,7 @@ FeeFilterRounder filterRounder(::minRelayTxFee);
 struct IteratorComparator
 {
     template<typename I>
-    bool operator()(const I& a, const I& b)
+    bool operator()(const I& a, const I& b) const
     {
         return &(*a) < &(*b);
     }