testcode.git

Experimenting with lamda and threads.
Parent 6e0f69c
David Blume

David Blume commited on 2016-01-10 18:20:39
Showing 5 changed files, with 57 additions and 4 deletions.

my_lib/Makefile
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@@ -1,5 +1,5 @@
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 CXX=g++
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-CPPFLAGS=-c -Wall -std=c++11 -I../include
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+CPPFLAGS=-c -Wall -std=c++14 -I../include
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 LDFLAGS=
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 OBJDIR=obj
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 LIBDIR=../lib
product/Makefile
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@@ -1,10 +1,11 @@
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 CXX=g++
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-CPPFLAGS=-c -Wall -std=c++11 -I../include
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+CPPFLAGS=-c -Wall -std=c++14 -I../include
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 LIBDIR=../lib
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-LDFLAGS=-L $(LIBDIR) -lmy_lib
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+LDFLAGS=-pthread -L $(LIBDIR) -lmy_lib
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 OBJDIR=obj
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-SOURCES=main.cpp main_helper.cpp ui/widget.cpp scoped_set_adder.cpp
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+SOURCES=main.cpp main_helper.cpp ui/widget.cpp \
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+	scoped_set_adder.cpp thread_with_lambda.cpp
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 # //OBJECTS=$(OBJDIR)$(SOURCES:.cpp=.o)
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 OBJECTS=$(foreach bname, $(basename $(SOURCES)), $(OBJDIR)/$(bname).o)
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 EXECUTABLE=main
product/main.cpp
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@@ -4,10 +4,12 @@
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 #include <iostream>
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 #include <algorithm>
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 #include <memory>
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+#include <complex>
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 #include "main_helper.hpp"
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 #include "scoped_set_adder.hpp"
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 #include "ui/widget.hpp"
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 #include "../include/my_lib.hpp"
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+#include "thread_with_lambda.hpp"
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 using namespace std;
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@@ -50,10 +52,27 @@ int remove_duplicates(int a[], int n)
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     return last + 1;
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 }
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+void test_cpp14() {
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+    // Store a generalized lambda, that squares a number, in a variable
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+    auto func = [](auto input) { return input * input; };
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+
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+    // square of an int
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+    std::cout << func(10) << std::endl;
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+
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+    // square of a double
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+    std::cout << func(2.345) << std::endl;
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+
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+    // square of a complex number
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+    std::cout << func(std::complex<double>(3, -2)) << std::endl;
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+}
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+
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 int main() {
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     length_of_array = 6;
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     int a[6] = { 10, 20, 20, 30, 40, 40 };
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     int item_to_remove = 20;
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+
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+    // thread_with_lambda();
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+
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     cout << "Removing " << item_to_remove << endl;
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     length_of_array = remove_element(a, length_of_array, item_to_remove);
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     cout << "a became " << a << endl;
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@@ -68,9 +87,11 @@ int main() {
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 	cout << "sizeof(int) is " << sizeof(int) << "." << endl;
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 	my_lib_fn();
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 	my_lib_fn(5);
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+    test_cpp14();
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 	{
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 		std::unique_ptr<int> up( new int() );
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+		scoped_set_adder set_adder("testing unique_ptr");
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 		if (up) {
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 		    cout << "unique_ptr passes if." << endl;
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 		} else {
product/thread_with_lambda.cpp
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@@ -0,0 +1,25 @@
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+#include <thread>
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+#include <mutex>
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+#include <iostream>
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+#include "thread_with_lambda.hpp"
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+
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+
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+namespace {
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+
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+std::mutex my_mutex;
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+std::thread worker;
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+
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+}
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+
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+void thread_with_lambda()
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+{
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+    uint32_t ticks = 10;
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+    std::lock_guard<std::mutex> lock(my_mutex);
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+    if (worker.joinable()) worker.join();
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+
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+    worker = std::thread([=]{
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+        for(uint32_t tick = 0; tick <= ticks; tick++) {
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+            std::cout << "count " << tick << std::endl;
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+        }
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+    });
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+}
product/thread_with_lambda.hpp
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@@ -0,0 +1,6 @@
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+#ifndef thread_with_lambda_hpp_
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+#define thread_with_lambda_hpp_
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+
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+void thread_with_lambda();
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+
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+#endif
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