struct_alignment.cpp

cpp/struct_alignment.cpp

@@ -0,0 +1,58 @@
+/*
+VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
+VIM: let b:cf5run="{OUT}"
+*/
+#include <iostream>
+#include <exception>
+#include <chrono>
+
+struct A {
+    long l;
+    char c;
+};
+
+struct L {
+    long l;
+};
+
+struct C {
+    char c;
+};
+
+struct B {
+    bool b;
+};
+
+int main ( void )
+{try{
+    auto begin = std::chrono::high_resolution_clock::now();
+
+    A a;
+    L l;
+    C c;
+    B b;
+
+    std::cout << "sizeof(A)=" << sizeof(A) << " &a=" << &a <<std::endl;
+    std::cout << "sizeof(L)=" << sizeof(L) << " &l=" << &l <<std::endl;
+    std::cout << "sizeof(C)=" << sizeof(C) << " &c=" << &c <<std::endl;
+    std::cout << "sizeof(B)=" << sizeof(B) << " &b=" << &b <<std::endl;
+    //......
+
+    auto end = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double> seconds = end - begin;
+    std::cout << "Time: " << seconds.count() << std::endl;
+    return 0;
+}
+catch ( const std::exception& e )
+{
+    std::cerr << std::endl
+            << "std::exception(\"" << e.what() << "\")." << std::endl;
+    return 2;
+}
+catch ( ... )
+{
+    std::cerr  << std::endl
+            << "unknown exception." << std::endl;
+    return 1;
+}}
+