1 files changed, 19 insertions, 1 deletions
diff --git a/base/string_util.cc b/base/string_util.cc
index 5990ef4..a66dae6 100644
--- a/base/string_util.cc
+++ b/base/string_util.cc
@@ -1182,6 +1182,24 @@ struct IntToStringT {
     }
   };
 
+  // This set of templates is very similar to the above templates, but
+  // for testing whether an integer is negative.
+  template <typename INT2, bool NEG2>
+  struct TestNegT { };
+  template <typename INT2>
+  struct TestNegT<INT2, false> {
+    static bool TestNeg(INT2 value) {
+      // value is unsigned, and can never be negative.
+      return false;
+    }
+  };
+  template <typename INT2>
+  struct TestNegT<INT2, true> {
+    static bool TestNeg(INT2 value) {
+      return value < 0;
+    }
+  };
+
   static STR IntToString(INT value) {
     // log10(2) ~= 0.3 bytes needed per bit or per byte log10(2**8) ~= 2.4.
     // So round up to allocate 3 output characters per byte, plus 1 for '-'.
@@ -1191,7 +1209,7 @@ struct IntToStringT {
     // then return the substr of what we ended up using.
     STR outbuf(kOutputBufSize, 0);
 
-    bool is_neg = value < 0;
+    bool is_neg = TestNegT<INT, NEG>::TestNeg(value);
     // Even though is_neg will never be true when INT is parameterized as
     // unsigned, even the presence of the unary operation causes a warning.
     UINT res = ToUnsignedT<INT, UINT, NEG>::ToUnsigned(value);