File ledger-3.1-fix-build-with-boost-1.58.patch of Package ledger

From a1cb25ad2d9a98ea9ec0bb3ee27fe3cde6046434 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johann=20Kl=C3=A4hn?= <kljohann@gmail.com>
Date: Sun, 10 May 2015 13:41:26 +0200
Subject: [PATCH] fix build for boost 1.58

---
 src/filters.cc   | 2 +-
 src/iterators.cc | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/filters.cc b/src/filters.cc
index 2f97a0e..b6530c0 100644
--- a/src/filters.cc
+++ b/src/filters.cc
@@ -707,7 +707,7 @@ namespace {
     insert_prices_in_map(price_map_t& _all_prices)
       : all_prices(_all_prices) {}
 
-    void operator()(datetime_t& date, const amount_t& price) {
+    void operator()(const datetime_t& date, const amount_t& price) {
       all_prices.insert(price_map_t::value_type(date, price));
     }
   };
diff --git a/src/iterators.cc b/src/iterators.cc
index 21bec5d..0225e21 100644
--- a/src/iterators.cc
+++ b/src/iterators.cc
@@ -96,7 +96,7 @@ namespace {
       TRACE_DTOR(create_price_xact);
     }
 
-    void operator()(datetime_t& date, const amount_t& price) {
+    void operator()(const datetime_t& date, const amount_t& price) {
       xact_t * xact;
       string   symbol = price.commodity().symbol();