Merge branch 'master' of https://github.com/chronolaw/cpp_study

program-spiritual · program-spiritual · commit e7d607a1bf74 · 2020-05-23T14:55:42.000+08:00
diff --git a/section1/compile.cpp b/section1/compile.cpp
@@ -7,7 +7,10 @@
 //
 // gcc -E -dM - < /dev/null
 
+#include <cassert>
+
 #include <typeinfo>
+#include <string>
 #include <iostream>
 #include <stdexcept>
 #include <type_traits>
@@ -33,6 +36,22 @@ struct fib<1>
     static const int value = 1;
 };
 
+#if __cplusplus >= 201402
+constexpr int const_fib(int n)
+{
+    if (n <= 1) {
+        return 1;
+    }
+
+    return const_fib(n - 1) + const_fib(n - 2);
+}
+#else   // C++11
+int const_fib(int n)
+{
+    return 42;
+}
+#endif
+
 //[[deprecated("deadline:2020-12-31")]]      // c++14 or later
 [[gnu::deprecated]] // c+11 or later
 int old_func()
@@ -107,6 +126,18 @@ void check_type(T v)
     cout << is_void<void>::value << endl;
 }
 
+void case5()
+{
+    int     i = 10;
+    int    *p = &i;
+
+    assert(i > 0 && "i must be greater than zero");
+    assert(p != nullptr);
+
+    std::string str = "hello";
+    assert(!str.empty());
+}
+
 int main()
 {
     using namespace std;
@@ -116,13 +147,16 @@ int main()
     cout << fib<4>::value << endl;
     cout << fib<5>::value << endl;
 
+    cout << const_fib(10) << endl;
+
     old_func();
     get_num();
 
     case2();
     case3();
 
     case4();
+    case5();
 
     check_type(10);
     //check_type((void*)0);
diff --git a/section4/sample_v3.proto b/section4/sample_v3.proto
@@ -0,0 +1,25 @@
+// Copyright (c) 2020 by Chrono
+//
+// protoc --cpp_out=. sample_v3.proto
+
+syntax = "proto3";
+
+package sample;
+
+message Vendor
+{
+    uint32     id      = 1;
+    string     name    = 2;
+    bool       valid   = 3;
+    string     tel     = 4;
+}
+
+message Product
+{
+    int32      id      = 1;
+    string     name    = 2;
+
+    string     tag     = 3;
+
+    Vendor     vendor  = 10;
+}
diff --git a/section5/srv.cpp b/section5/srv.cpp
@@ -73,7 +73,8 @@ try
             // async process msg
 
             // todo: try-catch
-            std::async(std::launch::async,
+            //auto f = std::async(std::launch::async,
+            std::thread(
             [&sum, msg_ptr]()
             //[&sum, &count](decltype(msg_ptr) ptr)
             {
@@ -90,7 +91,7 @@ try
                 //debug_print(book);
 
                 sum.add_sales(book);
-            });   // async
+            }).detach();   // async
         }   // for(;;)
     };  // recv_cycle lambda
 
@@ -126,13 +127,13 @@ try
         }   // for(;;)
     };  // log_cycle lambda
 
-    // launch recv_cycle then wait
-    auto fu = std::async(std::launch::async, recv_cycle);
-
     // launch log_cycle
-    std::async(std::launch::async, log_cycle);
+    auto fu1 = std::async(std::launch::async, log_cycle);
+
+    // launch recv_cycle then wait
+    auto fu2 = std::async(std::launch::async, recv_cycle);
 
-    fu.wait();
+    fu2.wait();
 }
 catch(std::exception& e)
 {
