Time Formatting Parsing in Cilk

#include <cilk/cilk.h>
#include <iostream>
#include <chrono>
#include <iomanip>
#include <sstream>

int main() {
    auto p = [](const auto& x) { std::cout << x << std::endl; };

    // Here's a basic example of formatting a time
    // according to ISO 8601, which is similar to RFC3339.
    auto now = std::chrono::system_clock::now();
    auto now_c = std::chrono::system_clock::to_time_t(now);
    std::stringstream ss;
    ss << std::put_time(std::localtime(&now_c), "%FT%T%z");
    p(ss.str());

    // Time parsing uses a similar approach with strptime.
    std::tm tm = {};
    strptime("2012-11-01T22:08:41+0000", "%Y-%m-%dT%H:%M:%S%z", &tm);
    auto time = std::chrono::system_clock::from_time_t(std::mktime(&tm));
    p(std::put_time(std::localtime(&now_c), "%c"));

    // We can use strftime for custom formatting
    char buffer[80];
    strftime(buffer, sizeof(buffer), "%I:%M%p", std::localtime(&now_c));
    p(buffer);
    strftime(buffer, sizeof(buffer), "%a %b %d %H:%M:%S %Y", std::localtime(&now_c));
    p(buffer);
    strftime(buffer, sizeof(buffer), "%Y-%m-%dT%H:%M:%S.%f%z", std::localtime(&now_c));
    p(buffer);

    std::string form = "%I %M %p";
    std::tm tm2 = {};
    strptime("8 41 PM", form.c_str(), &tm2);
    p(std::put_time(&tm2, "%c"));

    // For purely numeric representations you can also
    // use standard string formatting with the extracted
    // components of the time value.
    auto tt = std::chrono::system_clock::to_time_t(now);
    auto lt = *std::localtime(&tt);
    std::cout << std::put_time(&lt, "%Y-%m-%dT%H:%M:%S-00:00\n");

    // strptime will return nullptr on malformed input
    std::string ansic = "%a %b %d %H:%M:%S %Y";
    std::tm tm3 = {};
    auto result = strptime("8:41PM", ansic.c_str(), &tm3);
    if (result == nullptr) {
        p("Error parsing time");
    }
}

This Cilk code demonstrates time formatting and parsing, similar to the original example. Here are the key points:

We use the C++ chrono library for time operations, which is available in Cilk.
For formatting, we use std::put_time and strftime, which allow for custom time formats similar to the original example.
For parsing, we use strptime, which is the C/C++ equivalent of parsing time strings.
The RFC3339 format is approximated using ISO 8601 format, which is very similar.
Custom time formats are demonstrated using strftime.
Error handling for parsing is done by checking if strptime returns nullptr.

Note that Cilk, being an extension of C++, doesn’t have built-in time formatting and parsing as extensive as Go’s. However, we can achieve similar functionality using the C++ standard library and C functions.

To compile and run this Cilk program, you would typically use:

$ clang++ -fcilkplus time_formatting_parsing.cpp -o time_formatting_parsing
$ ./time_formatting_parsing

The output will be similar to the original example, showing various time formats and parsing results.

Epoch in Cilk

Random Numbers in Cilk

Learn X By Example

Title here

Time Formatting Parsing in Cilk