updated qtsingleapplication to v3.1.5

external/singleapplication/examples/basic/CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.7.0)
+
+project(basic LANGUAGES CXX)
+
+# SingleApplication base class
+set(QAPPLICATION_CLASS QCoreApplication)
+
+add_executable(basic main.cpp)
+
+find_package(Qt5 COMPONENTS Core REQUIRED)
+add_subdirectory(../.. SingleApplication)
+target_link_libraries(${PROJECT_NAME} SingleApplication::SingleApplication)
+

external/singleapplication/examples/basic/basic.pro

@@ -0,0 +1,5 @@
+# Single Application implementation
+include(../../singleapplication.pri)
+DEFINES += QAPPLICATION_CLASS=QCoreApplication
+
+SOURCES += main.cpp

external/singleapplication/examples/basic/main.cpp

@@ -0,0 +1,11 @@
+#include <singleapplication.h>
+
+int main(int argc, char* argv[])
+{
+    // Allow secondary instances
+    SingleApplication app(argc, argv);
+
+    qWarning() << "Started a new instance";
+
+    return app.exec();
+}