dbremner

#pragma once

#include <ostream>

/// RAII guard class for saving and restoring ostream state
class ostream_guard final
{
    std::ostream *os_;
    std::streamsize width_;
    std::streamsize precision_;

dbremner

#ifndef CHAR_PREDICATES_HPP
#define CHAR_PREDICATES_HPP

[[nodiscard]] static inline bool
is_digit(int ch)
{
	return ((ch >= '0') && (ch <= '9'));
}

[[nodiscard]] static inline bool

dbremner

/// Cast a nullable pointer to a non-null pointer
/// This is unsafe and should be justified with a comment
/// containing the keyword WHY
/// For example, "WHY - checked"
template <typename T>
[[nodiscard]] constexpr static inline auto
as_live(T *_Nullable value) -> T *_Nonnull
{
    return static_cast<T *_Nonnull>(value);
}

dbremner

#ifndef NULLABILITY_TYPEDEFS_H
#define NULLABILITY_TYPEDEFS_H

#define MAKE_NULLABILITY_TYPEDEFS(type, name)                                                       \
    typedef const type *const _Nonnull name##_pure_ptr;                                            \
    typedef const type *_Nonnull name##_const_ptr;                                                 \
    typedef type *_Nonnull name##_ptr;                                                             \
    typedef type *_Nullable name##_null_ptr;                                                       \
    typedef const type *const _Nullable name##_pure_null_ptr;                                      \
    typedef type *_Nonnull *_Nonnull name##_ptr_ptr;                                               \

dbremner

// ctime is an obsolete time function that is present in many older Unix programs.
// It's common for programs to call it and then modify the output.
// Here's a strftime format string that should produce the same output.
// dest_len should be >= 26
static void get_time_str(time_t val, char *dest, size_t dest_len)
{
  struct tm result;
  localtime_r(&val, &result);
  // e.g. Wed Oct 27 18:28:32 2021\n
  strftime(dest, dest_len, "%a %b %e %H:%M:%S %Y\n", &result);

dbremner

      integer go to, do 100 if, return
      character*12 read
      logical go to if
      real logical(30)
      data read / 12h(1x,i5,f8.1) /
      data go to, do 100 if, if 100 do / 2, 1, 30 /
      assign 100 to if go to
      do 100 if = do 100 if,if 100 do
        return = if
        logical(if) = return

dbremner

find . -type f -iname "*.*" -print | rev | cut -d . -f 1 | rev | sort | uniq -c | sort -nr | less

dbremner

import org.jetbrains.annotations.NotNull;

import javax.swing.ListModel;
import java.util.AbstractList;

public enum ListModels
{
    ;

    public static @NotNull <E> Iterable<E> asIterable(final @NotNull ListModel<E> model)

dbremner

#Ubuntu 16.04LTS does not apply network settings after boot.
#See https://bugs.launchpad.net/ubuntu/+source/procps/+bug/50093
#Work around this issue with a cron job to disable SACK
@reboot /bin/sleep 5 && /sbin/sysctl -w net.ipv4.tcp_sack=0

dbremner

Problem:
Time Machine backups accumulate until they fill the drive.

Solution:
1. Run "tmutil listbackups" from a shell and pipe the output to a file.
2. Use TextEdit pattern-based search and replace to quote each line of the file.
3. Select a subset of the file with a buffer of several years.
4. Open a terminal and run caffeinate to keep the computer from sleeping.
5. Open an interactive root shell with "sudo -i"
6. Use the following command to delete old backups.