From 3fdd76bd14ff122c6881d7f15ec5cb2629241e7a Mon Sep 17 00:00:00 2001
From: Ismael <ismaelJimenez@users.noreply.github.com>
Date: Fri, 3 Jun 2016 18:33:17 +0200
Subject: [PATCH] fix issue 235 (#236)

---
 src/complexity.cc       | 4 ++--
 test/complexity_test.cc | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/complexity.cc b/src/complexity.cc
index 24f1cf4e..93833f96 100644
--- a/src/complexity.cc
+++ b/src/complexity.cc
@@ -35,9 +35,9 @@ BigOFunc* FittingCurve(BigO complexity) {
     case oNCubed:
       return [](int n) -> double { return n * n * n; };
     case oLogN:
-      return [](int n) { return log2(n); };
+      return [](int n) { return std::log2(n); };
     case oNLogN:
-      return [](int n) { return n * log2(n); };
+      return [](int n) { return n * std::log2(n); };
     case o1:
     default:
       return [](int) { return 1.0; };
diff --git a/test/complexity_test.cc b/test/complexity_test.cc
index ee242021..8ab88f97 100644
--- a/test/complexity_test.cc
+++ b/test/complexity_test.cc
@@ -10,6 +10,7 @@
 #include <vector>
 #include <utility>
 #include <algorithm>
+#include <cmath>
 
 namespace {
 
@@ -220,7 +221,7 @@ static void BM_Complexity_O_N_log_N(benchmark::State& state) {
   state.SetComplexityN(state.range_x());
 }
 BENCHMARK(BM_Complexity_O_N_log_N) -> RangeMultiplier(2) -> Range(1<<10, 1<<16) -> Complexity(benchmark::oNLogN);
-BENCHMARK(BM_Complexity_O_N_log_N) -> RangeMultiplier(2) -> Range(1<<10, 1<<16) -> Complexity([](int n) {return n * log2(n); });
+BENCHMARK(BM_Complexity_O_N_log_N) -> RangeMultiplier(2) -> Range(1<<10, 1<<16) -> Complexity([](int n) {return n * std::log2(n); });
 BENCHMARK(BM_Complexity_O_N_log_N) -> RangeMultiplier(2) -> Range(1<<10, 1<<16) -> Complexity();
 
 const char* big_o_n_lg_n_test_name = "BM_Complexity_O_N_log_N_BigO";