Merge pull request #343 from SpM-lab/terasaki/pi

Define `M_PI` as necessary

Author: terasakisatoshi

include/sparseir/freq.hpp

@@ -7,6 +7,7 @@
 #include <stdexcept>
 #include <type_traits>
 
+#include "sparseir/sparseir-fwd.hpp"
 #include "sparseir/utils.hpp"
 
 namespace sparseir {

include/sparseir/sparseir-fwd.hpp

@@ -1,8 +1,15 @@
 #pragma once
 #include "version.h"
 
+
 namespace sparseir {
 
+// Some compiler for windows does not support M_PI
+// https://learn.microsoft.com/en-us/cpp/c-runtime-library/math-constants?view=msvc-170&redirectedfrom=MSDN
+#ifndef M_PI
+    #define M_PI 3.14159265358979323846
+#endif
+
 // Forward defitions
 // class PowerOfTwo;
 // class ExDouble;

include/sparseir/version.h

@@ -1,3 +1,3 @@
 #define SPARSEIR_VERSION_MAJOR 0
 #define SPARSEIR_VERSION_MINOR 3
-#define SPARSEIR_VERSION_PATCH 1
+#define SPARSEIR_VERSION_PATCH 2