* Use convert_cast instead of static_cast where feasible

cmake/config.h.in

@@ -1,3 +1,10 @@
 #pragma once
 
 #cmakedefine CPPCURL_HAS_CPPCORE
+
+#ifdef CPPCURL_HAS_CPPCORE
+    #include <cppcore/conversion/convert_cast.h>
+    #define cppcurl_convert_cast ::cppcore::convert_cast
+#else
+    #define cppcurl_convert_cast static_cast
+#endif

include/cppcurl/easy.inl

@@ -26,7 +26,7 @@ namespace cppcurl
             static inline void write(CURL* handle, CURLoption opt, bool val)
             {
                 easy_exception::throw_error(
-                    curl_easy_setopt(handle, opt, static_cast<long>(val)),
+                    curl_easy_setopt(handle, opt, cppcurl_convert_cast<long>(val)),
                     "Unable to set option on easy handle.");
             }
         };

include/cppcurl/exception.inl

@@ -55,7 +55,7 @@ namespace cppcurl
     {
         os  << error_str
             << '('
-            << static_cast<int>(error)
+            << cppcurl_convert_cast<int>(error)
             << "): "
             << message;
     }
@@ -63,7 +63,7 @@ namespace cppcurl
     template<typename T_error>
     exception<T_error>
         ::exception(T_error err, const std::string& msg)
-        : _what     (__impl::get_error_str<T_error>()(err) + "(" + std::to_string(static_cast<int>(err)) + "): " + msg)
+        : _what     (__impl::get_error_str<T_error>()(err) + "(" + std::to_string(cppcurl_convert_cast<int>(err)) + "): " + msg)
         , error     (err)
         , error_str (__impl::get_error_str<T_error>()(err))
         { }

test/CMakeLists.txt

@@ -45,7 +45,7 @@ ForEach                     ( FILE IN LISTS CPPCURL_TEST_SOURCE_FILES )
 
     # test
     If                          ( HAS_CMAKE_TESTS )
-        Add_CMake_Test              ( NAME ${TEST_NAME} TARGET ${TEST_NAME} )
+        Add_CMake_Test              ( NAME ${TEST_NAME} TARGET ${TEST_NAME} GROUP cppcurl )
     Else                        ( )
         Add_Test                    ( NAME ${TEST_NAME} COMMAND ${TEST_NAME} WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} )
     EndIf                       ( )