From 4e44539a590aac37ed70f5463b39959187d06cb2 Mon Sep 17 00:00:00 2001
From: "Jiangang (Jeff) Zhuang" <jgzhuang@users.noreply.github.com>
Date: Wed, 4 Jan 2017 15:09:05 -0500
Subject: [PATCH] export symbols on Windows

---
 tz.h | 50 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 20 deletions(-)

diff --git a/tz.h b/tz.h
index 1a74435..2a02801 100644
--- a/tz.h
+++ b/tz.h
@@ -4,6 +4,7 @@
 // The MIT License (MIT)
 //
 // Copyright (c) 2015, 2016 Howard Hinnant
+// Copyright (c) 2017 Jiangang Zhuang
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -73,6 +74,15 @@ static_assert(HAS_REMOTE_API == 0 ? AUTO_DOWNLOAD == 0 : true,
 #  define USE_SHELL_API 1
 #endif
 
+
+#ifdef _WIN32
+  #ifdef DATE_BUILD_DLL
+    #define DATE_API __declspec(dllexport)
+  #else
+    #define DATE_API __declspec(dllimport)
+  #endif
+#endif
+
 #include "date.h"
 
 #if defined(_MSC_VER) && (_MSC_VER < 1900)
@@ -351,7 +361,7 @@ public:
     time_zone& operator=(time_zone&& src);
 #endif  // defined(_MSC_VER) && (_MSC_VER < 1900)
 
-    explicit time_zone(const std::string& s, detail::undocumented);
+    DATE_API explicit time_zone(const std::string& s, detail::undocumented);
 
     const std::string& name() const NOEXCEPT;
 
@@ -372,15 +382,15 @@ public:
 
     friend bool operator==(const time_zone& x, const time_zone& y) NOEXCEPT;
     friend bool operator< (const time_zone& x, const time_zone& y) NOEXCEPT;
-    friend std::ostream& operator<<(std::ostream& os, const time_zone& z);
+    friend DATE_API std::ostream& operator<<(std::ostream& os, const time_zone& z);
 
-    void add(const std::string& s);
-    void adjust_infos(const std::vector<detail::Rule>& rules);
+    DATE_API void add(const std::string& s);
+    DATE_API void adjust_infos(const std::vector<detail::Rule>& rules);
 
 private:
-    sys_info   get_info_impl(sys_seconds tp) const;
-    local_info get_info_impl(local_seconds tp) const;
-    sys_info   get_info_impl(sys_seconds tp, int timezone) const;
+    DATE_API sys_info   get_info_impl(sys_seconds tp) const;
+    DATE_API local_info get_info_impl(local_seconds tp) const;
+    DATE_API sys_info   get_info_impl(sys_seconds tp, int timezone) const;
 
     void parse_info(std::istream& in);
 
@@ -525,7 +535,7 @@ private:
     std::string name_;
     std::string target_;
 public:
-    explicit link(const std::string& s);
+    DATE_API explicit link(const std::string& s);
 
     const std::string& name() const {return name_;}
     const std::string& target() const {return target_;}
@@ -533,7 +543,7 @@ public:
     friend bool operator==(const link& x, const link& y) {return x.name_ == y.name_;}
     friend bool operator< (const link& x, const link& y) {return x.name_ < y.name_;}
 
-    friend std::ostream& operator<<(std::ostream& os, const link& x);
+    friend DATE_API std::ostream& operator<<(std::ostream& os, const link& x);
 };
 
 inline bool operator!=(const link& x, const link& y) {return !(x == y);}
@@ -547,7 +557,7 @@ private:
     sys_seconds date_;
 
 public:
-    explicit leap(const std::string& s, detail::undocumented);
+    DATE_API explicit leap(const std::string& s, detail::undocumented);
 
     sys_seconds date() const {return date_;}
 
@@ -578,7 +588,7 @@ public:
         return x < y.date_;
     }
 
-    friend std::ostream& operator<<(std::ostream& os, const leap& x);
+    friend DATE_API std::ostream& operator<<(std::ostream& os, const leap& x);
 };
 
 inline bool operator!=(const leap& x, const leap& y) {return !(x == y);}
@@ -751,25 +761,25 @@ struct TZ_DB
 #endif  // !defined(_MSC_VER) || (_MSC_VER >= 1900)
 };
 
-std::ostream&
+DATE_API std::ostream&
 operator<<(std::ostream& os, const TZ_DB& db);
 
-const TZ_DB& get_tzdb();
-const TZ_DB& reload_tzdb();
+DATE_API const TZ_DB& get_tzdb();
+DATE_API const TZ_DB& reload_tzdb();
 
 #if HAS_REMOTE_API
-std::string remote_version();
-bool        remote_download(const std::string& version);
-bool        remote_install(const std::string& version);
+DATE_API std::string remote_version();
+DATE_API bool        remote_download(const std::string& version);
+DATE_API bool        remote_install(const std::string& version);
 #endif
 
-const time_zone* locate_zone(const std::string& tz_name);
+DATE_API const time_zone* locate_zone(const std::string& tz_name);
 #ifdef TZ_TEST
 #  if _WIN32
-const time_zone* locate_native_zone(const std::string& native_tz_name);
+DATE_API const time_zone* locate_native_zone(const std::string& native_tz_name);
 #  endif // _WIN32
 #endif // TZ_TEST
-const time_zone* current_zone();
+DATE_API const time_zone* current_zone();
 
 // zoned_time