portability

One of my favorite things about owning a USB flash storage device is hauling around a bunch of useful tools with me. I'd like to write some tools, and make them work well in this kind of environment. I know C# best, and I'm productive in it, so I could get a windows forms application up in no time that way. But what considerations should I account for in making a portable app? A few I can think of, but don't know answers to: 1) Language portability - Ok, I know that any machine I use it on will require a .NET runtime be installed. But as I only use a few windows machines regularly, this

If I have a multi-line string C++11 string constant such as R"""line 1 line 2 line3""" Is it defined what character(s) the line terminator/separator consist of? Keith Thompson The intent is that a newline in a raw string literal maps to a single '\n' character. This intent is not expressed as clearly as it should be, which has led to some confusion. Citations are to the 2011 ISO C++ standard. First, here's the evidence that it maps to a single '\n' character. A note in section 2.14.5 [lex.string] paragraph 4 says: [ Note: A source-file new-line in a raw string literal results in a new-line in

I am trying to write server that will communicate with any standard client that can make socket connections (e.g. telnet client) It started out as an echo server, which of course did not need to worry about network byte ordering. I am familiar with ntohs, ntohl, htons, htonl functions. These would be great by themselves if I were transfering either 16 or 32-bit ints, or if the characters in the string being sent were multiples of 2 or 4 bytes. I'd like create a function that operates on strings such as: str_ntoh(char* net_str, char* host_str, int len) { uint32_t* netp, hostp; netp = (uint32_t*

For a very large integer range, xrange (Python 2) should be used, which is renamed to range in Python 3. I assumed module six can provide a consistent why of writing. But I found six.moves.builtins.range returns a list in Python 2 and an iterable non-list object in Python 3, just as the name range does. Also, six.moves.builtins.xrange does not exist in Python 2. Was I using the wrong function in six ? Or does six simply not provide a solution for the range and xrange functions? I know I can test sys.version[0] and rename the function accordingly. I was just looking for a "Don't Repeat Yourself

The C standard (ISO/IEC 9899) states: 7.2x.2.2 The difftime function Synopsis #include <time.h> double difftime(time_t time1, time_t time0); Description The difftime function computes the difference between two calendar times: time1 - time0 . Returns The difftime function returns the difference expressed in seconds as a double . This leaves it ambiguous (I guess, intentionally) if the result accounts for leap seconds or not. The difference (26 seconds when comparing from 1970 to July 2015) matters in some applications. Most implementations of the C standard library do not account for leap

I'm writing C programs used as cgi's that generate and output gif images. They're used in HTML pages with tags of the form <img src="/cgi-bin/gifprogram.cgi?param=val&etc"> , where the query string params describe the image to be generated by the cgi. C program cgi's invoked like this emit their output to stdout. And in this case the output's a gif image containing lots of binary (non-printable) bytes. That's already working fine on Unix/Linux. But Windows apparently requires a separate non-portable _setmode(_fileno(stdout),_O_BINARY) call (and some Windows-specific #include 's). Otherwise you