moved ref_counter to separate source

It is rarely used and we don't need to spoil c++ sources using misc.h
with <optional> header.

src/utils/misc.h

@@ -75,25 +75,6 @@ void print_module_usage(const char *module_name, const struct key_val *options,
 
 #ifdef __cplusplus
 uint32_t parse_uint32(const char *value_str) noexcept(false);
-
-#include <optional>
-
-template<typename T> struct ref_count_init_once {
-        std::optional<T> operator()(T (*init)(void), int &i) {
-                if (i++ == 0) {
-                        return std::optional<T>(init());
-                }
-                return std::nullopt;
-        }
-};
-
-struct ref_count_terminate_last {
-        void operator()(void (*terminate)(void), int &i) {
-                if (--i == 0) {
-                        terminate();
-                }
-        }
-};
 #endif //__cplusplus
 
 #endif// UTILS_MISC_H_

src/utils/ref_count.hpp

@@ -0,0 +1,61 @@
+/**
+ * @file   utils/ref_count.hpp
+ * @author Martin Pulec     <pulec@cesnet.cz>
+ */
+/*
+ * Copyright (c) 2022 CESNET z.s.p.o.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, is permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. 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 with the distribution.
+ *
+ * 3. Neither the name of CESNET nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
+#define UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
+
+#include <optional>
+
+template<typename T> struct ref_count_init_once {
+        std::optional<T> operator()(T (*init)(void), int &i) {
+                if (i++ == 0) {
+                        return std::optional<T>(init());
+                }
+                return std::nullopt;
+        }
+};
+
+struct ref_count_terminate_last {
+        void operator()(void (*terminate)(void), int &i) {
+                if (--i == 0) {
+                        terminate();
+                }
+        }
+};
+
+#endif // defined UTILS_REF_COUNT_H_0FC2C86B_8E95_45EF_AADE_F0A5C4ECBC31
+

src/video_display/gl.cpp

@@ -79,7 +79,7 @@
 #include "module.h"
 #include "utils/color_out.h"
 #include "utils/macros.h" // OPTIMIZED_FOR
-#include "utils/misc.h"
+#include "utils/ref_count.hpp"
 #include "video.h"
 #include "video_display.h"
 #include "video_display/splashscreen.h"