Define math constants for Visual Studio

kokosxD · kokosxD · commit cadb1cb40c97 · 2021-05-21T18:35:59.000+03:00
Like M_PI as mentioned in some examples
diff --git a/README.md b/README.md
@@ -26,8 +26,6 @@ int main() {
 A more comprehensive example:
 ```cpp
 #include "matplotlibcpp.h"
-#include <cmath>
-
 namespace plt = matplotlibcpp;
 
 int main()
@@ -67,9 +65,7 @@ int main()
 
 Alternatively, matplotlib-cpp also supports some C++11-powered syntactic sugar:
 ```cpp
-#include <cmath>
 #include "matplotlibcpp.h"
-
 using namespace std;
 namespace plt = matplotlibcpp;
 
@@ -104,8 +100,6 @@ Or some *funny-looking xkcd-styled* example:
 ```cpp
 #include "matplotlibcpp.h"
 #include <vector>
-#include <cmath>
-
 namespace plt = matplotlibcpp;
 
 int main() {
@@ -291,4 +285,4 @@ Todo/Issues/Wishlist
 in "".'
 
 * MacOS: `Unable to import matplotlib.pyplot`. Cause: In mac os image rendering back end of matplotlib (what-is-a-backend to render using the API of Cocoa by default). There is Qt4Agg and GTKAgg and as a back-end is not the default. Set the back end of macosx that is differ compare with other windows or linux os.
-Solution is described [here](https://stackoverflow.com/questions/21784641/installation-issue-with-matplotlib-python?noredirect=1&lq=1), additional information can be found there too(see links in answers).
+Solution is described [here](https://stackoverflow.com/questions/21784641/installation-issue-with-matplotlib-python?noredirect=1&lq=1), additional information can be found there too(see links in answers).
diff --git a/matplotlibcpp.h b/matplotlibcpp.h
@@ -1,5 +1,10 @@
 #pragma once
 
+// Define math constants for Visual Studio https://docs.microsoft.com/en-us/cpp/c-runtime-library/math-constants
+#if defined(_MSC_VER)
+#define _USE_MATH_DEFINES
+#endif
+
 // Python headers must be included before any system headers, since
 // they define _POSIX_C_SOURCE
 #include <Python.h>
