From 8240422a096c7f5ab285d36ec7051a31116df54c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Marjam=C3=A4ki?= <danielm77@spray.se>
Date: Sun, 4 Sep 2011 20:48:05 +0200
Subject: [PATCH] Fixed #3078 (vector::at using int causes false positive)

---
 lib/checkunusedvar.cpp |  5 +++--
 test/testunusedvar.cpp | 10 ++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/checkunusedvar.cpp b/lib/checkunusedvar.cpp
index 2e5c3e430..72102e612 100644
--- a/lib/checkunusedvar.cpp
+++ b/lib/checkunusedvar.cpp
@@ -1144,8 +1144,9 @@ void CheckUnusedVar::checkFunctionVariableUsage()
                 variables.readAll(tok->next()->varId());
 
             // assignment
-            else if (Token::Match(tok, "*| (| ++|--| %var% ++|--| )| =") ||
-                     Token::Match(tok, "*| ( const| %type% *| ) %var% ="))
+            else if (!Token::Match(tok->tokAt(-2), "[;{}.] %var% (") &&
+                     (Token::Match(tok, "*| (| ++|--| %var% ++|--| )| =") ||
+                      Token::Match(tok, "*| ( const| %type% *| ) %var% =")))
             {
                 bool dereference = false;
                 bool pre = false;
diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index d0811621b..5e84990ca 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -84,6 +84,7 @@ private:
         TEST_CASE(localvar34); // ticket #2368
         TEST_CASE(localvar35); // ticket #2535
         TEST_CASE(localvar36); // ticket #2805
+        TEST_CASE(localvar37); // ticket #3078
         TEST_CASE(localvaralias1);
         TEST_CASE(localvaralias2); // ticket #1637
         TEST_CASE(localvaralias3); // ticket #1639
@@ -1400,6 +1401,15 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void localvar37() // ticket #3078
+    {
+        functionVariableUsage("void f() {\n"
+                              "    int a = 2;\n"
+                              "    ints.at(a) = 0;\n"
+                              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void localvaralias1()
     {
         functionVariableUsage("void foo()\n"