From ec72c70684cf380070d4020a46cec7f9b3832af3 Mon Sep 17 00:00:00 2001
From: Tim Ebbeke <Tim06TR@gmail.com>
Date: Sat, 30 Nov 2024 23:54:20 +0100
Subject: [PATCH] Fixed scope exit class.

---
 nui/include/nui/utility/scope_exit.hpp        | 30 ++++++-------------
 .../nui/backend/environment_variables_win.cpp |  2 +-
 ...mac_webview_config_from_window_options.ipp |  2 --
 nui/src/nui/backend/window.cpp                |  6 ++--
 nui/src/nui/backend/window_impl_linux.ipp     | 10 +++----
 5 files changed, 18 insertions(+), 32 deletions(-)

diff --git a/nui/include/nui/utility/scope_exit.hpp b/nui/include/nui/utility/scope_exit.hpp
index 7324812b..79a962dd 100644
--- a/nui/include/nui/utility/scope_exit.hpp
+++ b/nui/include/nui/utility/scope_exit.hpp
@@ -3,36 +3,26 @@
 #include <nui/utility/unique_identifier.hpp>
 
 #include <functional>
+#include <type_traits>
 #include <utility>
 
 namespace Nui
 {
-    template <typename EF>
     class ScopeExit
     {
       public:
-        ScopeExit(EF&& func)
-            : onExit_(std::forward<EF>(func))
+        template <typename FunctionT>
+        requires std::is_nothrow_invocable_v<FunctionT>
+        explicit ScopeExit(FunctionT&& func)
+            : onExit_(std::forward<FunctionT>(func))
         {}
         ~ScopeExit()
         {
             if (onExit_)
                 onExit_();
         }
-        ScopeExit(ScopeExit&& other)
-            : onExit_(std::move(other.onExit_))
-        {
-            other.onExit_ = {};
-        }
-        ScopeExit& operator=(ScopeExit&& other)
-        {
-            if (this != &other)
-            {
-                onExit_ = std::move(other.onExit_);
-                other.onExit_ = {};
-            }
-            return *this;
-        }
+        ScopeExit(ScopeExit&& other) = delete;
+        ScopeExit& operator=(ScopeExit&& other) = delete;
         ScopeExit(const ScopeExit&) = delete;
         ScopeExit& operator=(const ScopeExit&) = delete;
         void disarm()
@@ -43,8 +33,6 @@ namespace Nui
       private:
         std::function<void()> onExit_;
     };
-    template <typename T>
-    ScopeExit(T) -> ScopeExit<T>;
 
     namespace Detail
     {
@@ -53,10 +41,10 @@ namespace Nui
             template <typename FunctionT>
             auto operator->*(FunctionT&& fn) const
             {
-                return ScopeExit<FunctionT>(std::forward<FunctionT>(fn));
+                return ScopeExit{std::forward<FunctionT>(fn)};
             }
         };
     }
 
-#define NUI_ON_SCOPE_EXIT auto NUI_UNIQUE_IDENTIFIER = ::Nui::Detail::MakeScopeExitImpl{}->*[&]
+#define NUI_ON_SCOPE_EXIT auto NUI_UNIQUE_IDENTIFIER = ::Nui::Detail::MakeScopeExitImpl{}->*[&]() noexcept
 }
\ No newline at end of file
diff --git a/nui/src/nui/backend/environment_variables_win.cpp b/nui/src/nui/backend/environment_variables_win.cpp
index 6b19dd83..be6c634f 100644
--- a/nui/src/nui/backend/environment_variables_win.cpp
+++ b/nui/src/nui/backend/environment_variables_win.cpp
@@ -12,7 +12,7 @@ namespace Nui
         auto* envStrings = GetEnvironmentStrings();
         if (envStrings == nullptr)
             return {};
-        auto remover = ScopeExit{[&envStrings]() {
+        auto remover = ScopeExit{[&envStrings]() noexcept {
             FreeEnvironmentStrings(envStrings);
         }};
         // var1=value1\0var2=value2\0\0
diff --git a/nui/src/nui/backend/mac_webview_config_from_window_options.ipp b/nui/src/nui/backend/mac_webview_config_from_window_options.ipp
index c10de383..27147a0c 100644
--- a/nui/src/nui/backend/mac_webview_config_from_window_options.ipp
+++ b/nui/src/nui/backend/mac_webview_config_from_window_options.ipp
@@ -158,8 +158,6 @@ namespace Nui::MacOs
 
     id wkWebViewConfigurationFromOptions(HostNameMappingInfo const* mappingInfo, WindowOptions const& options)
     {
-        std::vector<Nui::ScopeExit<std::function<void()>>> cleaners;
-
         auto const* opts = &options;
         std::optional<WindowOptions> optCopy;
         if (options.folderMappingScheme)
diff --git a/nui/src/nui/backend/window.cpp b/nui/src/nui/backend/window.cpp
index 4daef5f4..280ccc3d 100644
--- a/nui/src/nui/backend/window.cpp
+++ b/nui/src/nui/backend/window.cpp
@@ -461,8 +461,8 @@ namespace Nui
             }
             if (msg.message == WM_APP)
             {
-                auto f = reinterpret_cast<std::function<void()>*>(msg.lParam);
-                ScopeExit se{[f]() {
+                auto* f = reinterpret_cast<std::function<void()>*>(msg.lParam);
+                ScopeExit se{[f]() noexcept {
                     // yuck! but this is from webview internals
                     delete f;
                 }};
@@ -679,7 +679,7 @@ namespace Nui
 
         if (wv23 == nullptr)
             throw std::runtime_error("Could not get interface to set mapping.");
-        auto releaseInterface = Nui::ScopeExit{[wv23] {
+        auto releaseInterface = Nui::ScopeExit{[wv23]() noexcept {
             wv23->Release();
         }};
 
diff --git a/nui/src/nui/backend/window_impl_linux.ipp b/nui/src/nui/backend/window_impl_linux.ipp
index c0678324..17258237 100644
--- a/nui/src/nui/backend/window_impl_linux.ipp
+++ b/nui/src/nui/backend/window_impl_linux.ipp
@@ -57,10 +57,10 @@ extern "C" {
         // const auto scheme = std::string_view{webkit_uri_scheme_request_get_scheme(request)};
         const auto uri = std::string_view{webkit_uri_scheme_request_get_uri(request)};
 
-        auto exitError = Nui::ScopeExit{[&] {
+        auto exitError = Nui::ScopeExit{[&]() noexcept {
             auto* error =
                 g_error_new(WEBKIT_DOWNLOAD_ERROR_DESTINATION, 1, "Invalid custom scheme / Host name mapping.");
-            auto freeError = Nui::ScopeExit{[error] {
+            auto freeError = Nui::ScopeExit{[error]() noexcept {
                 g_error_free(error);
             }};
             webkit_uri_scheme_request_finish_error(request, error);
@@ -84,7 +84,7 @@ extern "C" {
                 auto* stream = webkit_uri_scheme_request_get_http_body(request);
                 if (stream == nullptr)
                     return std::string{};
-                Nui::ScopeExit deleteStream = Nui::ScopeExit{[stream] {
+                Nui::ScopeExit deleteStream = Nui::ScopeExit{[stream]() noexcept {
                     g_input_stream_close(stream, nullptr, nullptr);
                 }};
 
@@ -94,10 +94,10 @@ extern "C" {
                 GError* error = NULL;
                 gchar* data = g_data_input_stream_read_upto(dataInputStream, "", 0, &length, NULL, &error);
 
-                Nui::ScopeExit freeData = Nui::ScopeExit{[data] {
+                Nui::ScopeExit freeData = Nui::ScopeExit{[data]() noexcept {
                     g_free(data);
                 }};
-                Nui::ScopeExit freeError = Nui::ScopeExit{[error] {
+                Nui::ScopeExit freeError = Nui::ScopeExit{[error]() noexcept {
                     g_error_free(error);
                 }};