Commonly Used Code Pieces

c_cpp_useful_code_pieces.h

// thread sleep in C++11
void ThreadSleep(int duration_ms) {
  std::cout << "Thread Sleeping..." << std::endl;
  auto start = std::chrono::high_resolution_clock::now();
  std::this_thread::sleep_for(std::chrono::milliseconds(duration_ms));
  auto end = std::chrono::high_resolution_clock::now();
  std::chrono::duration<double, std::milli> elapsed = end - start;
  cout << << "Thread Awake. Sleeping for " << elapsed.count() << " ms." << std::cout;
}

// ====================
// dbg.h
// ====================
#ifndef __dbg_h__
#define __dbg_h__

#include <stdio.h>
#include <errno.h>
#include <string.h>

#ifdef NDEBUG
#define debug(M, ...)
#else
#define debug(M, ...) fprintf(stderr, "DEBUG %s:%d: " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
#endif

#define clean_errno() (errno == 0 ? "None" : strerror(errno))
#define log_err(M, ...) fprintf(stderr, "[ERROR] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
#define log_warn(M, ...) fprintf(stderr, "[WARN] (%s:%d: errno: %s) " M "\n", __FILE__, __LINE__, clean_errno(), ##__VA_ARGS__)
#define log_info(M, ...) fprintf(stderr, "[INFO] (%s:%d) " M "\n", __FILE__, __LINE__, ##__VA_ARGS__)
#define check(A, M, ...) if(!(A)) { log_err(M, ##__VA_ARGS__); errno=0; goto error; }https://gist.github.com/qiao-tw/c3773cc198792704b688ea980a30e113
#define sentinel(M, ...)  { log_err(M, ##__VA_ARGS__); errno=0; goto error; }
#define check_mem(A) check((A), "Out of memory.")
#define check_debug(A, M, ...) if(!(A)) { debug(M, ##__VA_ARGS__); errno=0; goto error; }
#endif

// ===================
// debug.h
// ===================
#include <cstring>
#define __FILENAME__ (strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__)
#define TRACE_FUNC \
  do { \
    std::cout << __FILENAME__ << ":" << __LINE__ << " in " << __func__ << std::endl; \
  } while (0);

// == trace functions and estimate elpse time ==
#include <miniglog/glog/logging.h>
#define DEXEC(fn)                                                      \
  do {                                                                 \
    DLOG(INFO) << "[EXEC " << #fn << " START]";                        \
    std::chrono::steady_clock::time_point begin =                      \
      std::chrono::steady_clock::now();                                \
    fn;                                                                \
    std::chrono::steady_clock::time_point end =                        \
      std::chrono::steady_clock::now();                                \
    DLOG(INFO) << "[EXEC " << #fn << " FINISHED in "                   \
             << std::chrono::duration_cast<std::chrono::microseconds>  \
               (end - begin).count() << " us]";                        \
  } while (0);
// Usage:
// DEXEC(foo());
// -- output --
// foo.cpp: 123 [EXEC foo() START]
// foo.cpp: 123 [EXEC foo() FINISHED in 456 ms]

#define DTRACE  DLOG(INFO) << __func__;
// Usage:
// void foo() {
//   DTRACE
// }
// -- output --
// foo.cpp: 123 void foo(void)

#define PAUSE(format, ...) \
  fprintf(stderr, format, ##__VA_ARGS__);    \
  fgetc(stdin)
// Usage:
// void foo_pause() {
//   PAUSE("%s: Press ENTER to continue...\n", __func__);
// }

// ===================
// file_operations.hpp
// ===================
#include <iostream>
#include <string>

bool GetFileDirectory (const string& file_path, string& dir_path)
{
  size_t found = file_path.find_last_of("/\\");
  if (found == string::npos) return false;
  dir_path = file_path.substr(0,found);
  return true;
}

bool GetFileName (const string& file_path, string& file_name)
{
  size_t found = file_path.find_first_of("/\\");
  if (found == string::npos) return false;
  file_name = file_path.substr(found+1);
  return true;
}

bool GetLinesFromFile(const string& file_path, vector<string>& lines)
{
  lines.clear();
  ifstream file(file_path.c_str(), ios::in);
  if (file.good()) {
    string str;
    while(getline(file, str)) {
      lines.push_back(str);
    }
  }
  if (lines.empty()) return false;
  return true;
}
//========================================================