fix makefile

tweak Async

Author: Adam Horvath

.cproject

@@ -16,9 +16,9 @@
 			<storageModule moduleId="cdtBuildSystem" version="4.0.0">
 				<configuration artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe,org.eclipse.cdt.build.core.buildType=org.eclipse.cdt.build.core.buildType.debug" cleanCommand="rm -rf" description="" id="cdt.managedbuild.config.gnu.exe.debug.1324808345" name="Debug" parent="cdt.managedbuild.config.gnu.exe.debug">
 					<folderInfo id="cdt.managedbuild.config.gnu.exe.debug.1324808345." name="/" resourcePath="">
-						<toolChain id="cdt.managedbuild.toolchain.gnu.exe.debug.2058173028" name="Linux GCC" superClass="cdt.managedbuild.toolchain.gnu.exe.debug">
+						<toolChain id="cdt.managedbuild.toolchain.gnu.exe.debug.2058173028" name="Linux GCC" nonInternalBuilderId="cdt.managedbuild.target.gnu.builder.exe.debug" superClass="cdt.managedbuild.toolchain.gnu.exe.debug">
 							<targetPlatform id="cdt.managedbuild.target.gnu.platform.exe.debug.631645193" name="Debug Platform" superClass="cdt.managedbuild.target.gnu.platform.exe.debug"/>
-							<builder buildPath="${workspace_loc:/cpp11}/Debug" id="cdt.managedbuild.target.gnu.builder.exe.debug.59758397" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="Gnu Make Builder" superClass="cdt.managedbuild.target.gnu.builder.exe.debug"/>
+							<builder arguments="-std=c++11 -o cpp11 *.cpp" buildPath="${workspace_loc:/cpp11/src}" command="clang++" id="cdt.managedbuild.target.gnu.builder.exe.debug.428551382" keepEnvironmentInBuildfile="false" managedBuildOn="false" name="Gnu Make Builder" superClass="cdt.managedbuild.target.gnu.builder.exe.debug"/>
 							<tool id="cdt.managedbuild.tool.gnu.archiver.base.719411554" name="GCC Archiver" superClass="cdt.managedbuild.tool.gnu.archiver.base"/>
 							<tool id="cdt.managedbuild.tool.gnu.cpp.compiler.exe.debug.1313804263" name="GCC C++ Compiler" superClass="cdt.managedbuild.tool.gnu.cpp.compiler.exe.debug">
 								<option id="gnu.cpp.compiler.exe.debug.option.optimization.level.1699704852" name="Optimization Level" superClass="gnu.cpp.compiler.exe.debug.option.optimization.level" value="gnu.cpp.compiler.optimization.level.none" valueType="enumerated"/>

src/Async.cpp

@@ -15,31 +15,29 @@ Async::~Async() {}
 
 void Async::GetForecasts() const
 {
-	 auto debrecen = std::async( GetCityForecast, std::string("Debrecen") );
-	 auto lima = std::async( GetCityForecast, "Lima" );
-	 auto norberg = std::async( GetCityForecast, "Norberg" );
-	 auto piemonte = std::async( GetCityForecast, "Piemonte" );
+	 auto debrecen = std::async( std::launch::async, GetCityForecast, std::string("Debrecen") );
+	 auto lima     = std::async( std::launch::async, GetCityForecast, "Lima" );
+	 auto norberg  = std::async( std::launch::async, GetCityForecast, "Norberg" );
+	 auto piemonte = std::async( std::launch::async, GetCityForecast, "Piemonte" );
 
 	 // Perform other tasks here while temperatures get fetched
+	 std::this_thread::sleep_for(std::chrono::seconds(8));
 
 	 std::cout << "Temperature Forecasts: " << std::endl;
 	 std::cout << "Debrecen: " << debrecen.get() << std::endl;
-	 std::cout << "Lima: " << lima.get() << std::endl;
-	 std::cout << "Norberg: " << norberg.get() << std::endl;
+	 std::cout << "Lima: "     << lima.get() << std::endl;
+	 std::cout << "Norberg: "  << norberg.get() << std::endl;
 	 std::cout << "Piemonte: " << piemonte.get() << std::endl;
 }
 
 
 
 int Async::GetCityForecast( const std::string& city )
 {
-	auto seed = reinterpret_cast<const __int64_t>(&city);
-	std::srand(seed);
-
 	// Fake calulation time
-	int delay = 2 + std::rand() % 8;
+	int delay = 2 + std::rand() % 6;
 	std::this_thread::sleep_for(std::chrono::seconds(delay));
-
+	std::cout << "Calculated: " << city << std::endl;
 	int temperature = -5 + std::rand() % 40;
 	return temperature;
 }

src/make

@@ -1 +1 @@
-clang++ -std=c++14 -o cpp11 *.cpp
+clang++ -std=c++14 -o cpp11 -pthread *.cpp