Replace math.h with cmath

src/win32-math.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 // Extra POSIX/ANSI routines for Win32 when using Visual Studio C++. Please
 // refer to The Open Group Base Specification for specification of the correct
 // semantics for these functions.
 // (http://www.opengroup.org/onlinepubs/000095399/)
 #ifdef _MSC_VER
 
 #undef V8_WIN32_LEAN_AND_MEAN
 #define V8_WIN32_HEADERS_FULL
 #include "win32-headers.h"
 #include <limits.h>        // Required for INT_MAX etc.
-#include <math.h>
 #include <float.h>         // Required for DBL_MAX and on Win32 for finite()
+#include <cmath>
 #include "win32-math.h"
 
 #include "checks.h"
 
-namespace v8 {
 
-// Test for finite value - usually defined in math.h
-int isfinite(double x) {
-  return _finite(x);
-}
-
-}  // namespace v8
-
+namespace std {
 
 // Test for a NaN (not a number) value - usually defined in math.h
 int isnan(double x) {
   return _isnan(x);
 }
 
 
 // Test for infinity - usually defined in math.h
 int isinf(double x) {
   return (_fpclass(x) & (_FPCLASS_PINF | _FPCLASS_NINF)) != 0;
 }
 
 
+// Test for finite value - usually defined in math.h
+int isfinite(double x) {
+  return _finite(x);
+}
+
+
 // Test if x is less than y and both nominal - usually defined in math.h
 int isless(double x, double y) {
   return isnan(x) || isnan(y) ? 0 : x < y;
 }
 
 
 // Test if x is greater than y and both nominal - usually defined in math.h
 int isgreater(double x, double y) {
   return isnan(x) || isnan(y) ? 0 : x > y;
 }
@@ skipping 20 matching lines @@
 // Test sign - usually defined in math.h
 int signbit(double x) {
   // We need to take care of the special case of both positive
   // and negative versions of zero.
   if (x == 0)
     return _fpclass(x) & _FPCLASS_NZ;
   else
     return x < 0;
 }
 
+}  // namespace std
+
 #endif  // _MSC_VER