yifu

#include <iostream>
#include <vector>

using namespace std;

// clang++ -std=c++11 -stdlib=libc++ -Weverything mergesort.cpp

vector<int> merge_sort(vector<int> v);
vector<int> merge(vector<int> left, vector<int> right);
ostream& operator << (ostream& os, vector<int> v);

yifu

#include <iostream>
#include <memory>

struct A
{
  virtual void process();
};

struct B : public A
{

yifu

#include <iostream>

int main()
{
char pre [4] = "123";
char buf [4] = "123";
char post[4] = "123";
std::cin.width(3);
std::cin >> buf;
std::cout << pre << "," << buf << "," << post << std::endl;

yifu

#include <iostream>

void f(int) { std::cout << "f(int)" << std::endl; }

void f(char *) { std::cout << "f(char *)" << std::endl; }

int main()
{
  std::cout << "hello world" << std::endl;
  

yifu

#include <iostream>

void f(int) { std::cout << "f(int)" << std::endl; }

void f(char *) { std::cout << "f(char *)" << std::endl; }

int main()
{
  std::cout << "hello world" << std::endl;
  

yifu

#include <iostream>

void f(int) { std::cout << "f(int)" << std::endl; }

void f(char *) { std::cout << "f(char *)" << std::endl; }

int main()
{
  std::cout << "hello world" << std::endl;
  

yifu

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>

#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

#include <ace/OS.h>

yifu

#include <iostream>
#include <unistd.h>

int main()
{
    {
        char name [1024] = "";
        const int result = gethostname( name, sizeof name );
        std::cout << "result [" << result << "] name[" << name << "]" << std::endl;
    }

yifu

#include <ace/Semaphore.h>

#include <iostream>

int main()
{
  std::cout << "hello wordl" << std::endl;
  ACE_Semaphore signal( 0, USYNC_THREAD, "test_ACE_sem" );
  signal.dump();
  signal.release();

yifu

#include <iostream>

#include "semaphore.h"

int main()
{
  std::cout << "hello world" << std::endl;
  sem_t temp;
  const int result = sem_init( &temp, 0, 0 );
  std::cout << " result = [" << result  << "]" << std::endl;