Platform: add default argument to createContext().

Somebody would just want to defer context creation after parsing
arguments or doing some validations without any particular setup, thus
having to write even the {} is annoying.

src/Platform/AbstractXApplication.cpp

@@ -44,6 +44,8 @@ AbstractXApplication::AbstractXApplication(Implementation::AbstractContextHandle
 
 AbstractXApplication::AbstractXApplication(Implementation::AbstractContextHandler<Display*, VisualID, Window>* contextHandler, const Arguments&, std::nullptr_t): contextHandler(contextHandler), c(nullptr), flags(Flag::Redraw) {}
 
+void AbstractXApplication::createContext() { createContext({}); }
+
 void AbstractXApplication::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/AbstractXApplication.h

@@ -88,7 +88,13 @@ class AbstractXApplication {
         ~AbstractXApplication();
 
         /** @copydoc Sdl2Application::createContext() */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);

src/Platform/GlutApplication.cpp

@@ -42,7 +42,7 @@ GlutApplication::GlutApplication(const Arguments& arguments, const Configuration
 #ifndef DOXYGEN_GENERATING_OUTPUT
 GlutApplication::GlutApplication(const Arguments& arguments): c(nullptr) {
     initialize(arguments.argc, arguments.argv);
-    createContext({});
+    createContext();
 }
 #endif
 
@@ -59,6 +59,8 @@ void GlutApplication::initialize(int& argc, char** argv) {
     glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION);
 }
 
+void GlutApplication::createContext() { createContext({}); }
+
 void GlutApplication::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/GlutApplication.h

@@ -114,7 +114,13 @@ class GlutApplication {
         ~GlutApplication();
 
         /** @copydoc Sdl2Application::createContext() */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);

src/Platform/NaClApplication.cpp

@@ -60,7 +60,7 @@ NaClApplication::NaClApplication(const Arguments& arguments, const Configuration
 #ifndef DOXYGEN_GENERATING_OUTPUT
 NaClApplication::NaClApplication(const Arguments& arguments): Instance(arguments), Graphics3DClient(this), MouseLock(this), c(nullptr) {
     debugOutput = new ConsoleDebugOutput(this);
-    createContext({});
+    createContext();
 }
 #endif
 
@@ -68,6 +68,8 @@ NaClApplication::NaClApplication(const Arguments& arguments, std::nullptr_t): In
     debugOutput = new ConsoleDebugOutput(this);
 }
 
+void NaClApplication::createContext() { createContext({}); }
+
 void NaClApplication::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/NaClApplication.h

@@ -179,7 +179,13 @@ class NaClApplication: public pp::Instance, public pp::Graphics3DClient, public
         ~NaClApplication();
 
         /** @copydoc Sdl2Application::createContext() */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);

src/Platform/Sdl2Application.cpp

@@ -68,7 +68,7 @@ Sdl2Application::Sdl2Application(const Arguments&, const Configuration& configur
 #ifndef DOXYGEN_GENERATING_OUTPUT
 Sdl2Application::Sdl2Application(const Arguments&): context(nullptr), flags(Flag::Redraw) {
     initialize();
-    createContext({});
+    createContext();
 }
 #endif
 
@@ -88,6 +88,8 @@ void Sdl2Application::initialize() {
     }
 }
 
+void Sdl2Application::createContext() { createContext({}); }
+
 void Sdl2Application::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/Sdl2Application.h

@@ -182,7 +182,13 @@ class Sdl2Application {
          * constructor itself. The program exits if the context cannot be
          * created, see @ref tryCreateContext() for an alternative.
          */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /**
          * @brief Try to create context with given configuration

src/Platform/WindowlessGlxApplication.cpp

@@ -41,12 +41,14 @@ WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&, const Confi
 
 #ifndef DOXYGEN_GENERATING_OUTPUT
 WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&): c(nullptr) {
-    createContext({});
+    createContext();
 }
 #endif
 
 WindowlessGlxApplication::WindowlessGlxApplication(const Arguments&, std::nullptr_t): c(nullptr) {}
 
+void WindowlessGlxApplication::createContext() { createContext({}); }
+
 void WindowlessGlxApplication::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/WindowlessGlxApplication.h

@@ -107,7 +107,13 @@ class WindowlessGlxApplication {
         ~WindowlessGlxApplication();
 
         /** @copydoc Sdl2Application::createContext() */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);

src/Platform/WindowlessNaClApplication.cpp

@@ -59,7 +59,7 @@ WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments,
 #ifndef DOXYGEN_GENERATING_OUTPUT
 WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments): Instance(arguments), Graphics3DClient(this), c(nullptr) {
     debugOutput = new ConsoleDebugOutput(this);
-    createContext({});
+    createContext();
 }
 #endif
 
@@ -67,6 +67,8 @@ WindowlessNaClApplication::WindowlessNaClApplication(const Arguments& arguments,
     debugOutput = new ConsoleDebugOutput(this);
 }
 
+void WindowlessNaClApplication::createContext() { createContext({}); }
+
 void WindowlessNaClApplication::createContext(const Configuration& configuration) {
     if(!tryCreateContext(configuration)) std::exit(1);
 }

src/Platform/WindowlessNaClApplication.h

@@ -123,7 +123,13 @@ class WindowlessNaClApplication: public pp::Instance, public pp::Graphics3DClien
         ~WindowlessNaClApplication();
 
         /** @copydoc Sdl2Application::createContext() */
+        #ifdef DOXYGEN_GENERATING_OUTPUT
+        void createContext(const Configuration& configuration = Configuration());
+        #else
+        /* To avoid "invalid use of incomplete type" */
         void createContext(const Configuration& configuration);
+        void createContext();
+        #endif
 
         /** @copydoc Sdl2Application::tryCreateContext() */
         bool tryCreateContext(const Configuration& configuration);

src/Platform/magnum-info.cpp

@@ -70,7 +70,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
 
     /* Create context after parsing arguments, so the help can be displayed
        without creating context */
-    createContext({});
+    createContext();
     Context* c = Context::current();
 
     /* Pass debug output as messages to JavaScript */

src/Text/fontconverter.cpp

@@ -62,7 +62,7 @@ FontConverter::FontConverter(const Arguments& arguments): Platform::WindowlessAp
         .setHelp("Converts font to raster one of given atlas size.")
         .parse(arguments.argc, arguments.argv);
 
-    createContext({});
+    createContext();
 }
 
 int FontConverter::exec() {

src/TextureTools/distancefieldconverter.cpp

@@ -61,7 +61,7 @@ DistanceFieldConverter::DistanceFieldConverter(const Arguments& arguments): Wind
         .setHelp("Converts black&white image to distance-field representation.")
         .parse(arguments.argc, arguments.argv);
 
-    createContext({});
+    createContext();
 }
 
 int DistanceFieldConverter::exec() {