cplusplus.com Open in urlscan Pro
54.39.7.252  Public Scan

Form analysis
2 forms found in the DOM

<form class="gsc-search-box gsc-search-box-tools" accept-charset="utf-8">
  <table cellspacing="0" cellpadding="0" role="presentation" class="gsc-search-box">
    <tbody>
      <tr>
        <td class="gsc-input">
          <div class="gsc-input-box" id="gsc-iw-id1">
            <table cellspacing="0" cellpadding="0" role="presentation" id="gs_id50" class="gstl_50 gsc-input" style="width: 100%; padding: 0px;">
              <tbody>
                <tr>
                  <td id="gs_tti50" class="gsib_a"><input autocomplete="off" type="text" size="10" class="gsc-input" name="search" title="search" aria-label="search" id="gsc-i-id1" dir="ltr" spellcheck="false"
                      style="width: 100%; padding: 0px; border: none; margin: 0px; height: auto; outline: none;"></td>
                  <td class="gsib_b">
                    <div class="gsst_b" id="gs_st50" dir="ltr"><a class="gsst_a" href="javascript:void(0)" title="Clear search box" role="button" style="display: none;"><span class="gscb_a" id="gs_cb50" aria-hidden="true">×</span></a></div>
                  </td>
                </tr>
              </tbody>
            </table>
          </div>
        </td>
        <td class="gsc-search-button"><button class="gsc-search-button gsc-search-button-v2"><svg width="13" height="13" viewBox="0 0 13 13">
              <title>search</title>
              <path
                d="m4.8495 7.8226c0.82666 0 1.5262-0.29146 2.0985-0.87438 0.57232-0.58292 0.86378-1.2877 0.87438-2.1144 0.010599-0.82666-0.28086-1.5262-0.87438-2.0985-0.59352-0.57232-1.293-0.86378-2.0985-0.87438-0.8055-0.010599-1.5103 0.28086-2.1144 0.87438-0.60414 0.59352-0.8956 1.293-0.87438 2.0985 0.021197 0.8055 0.31266 1.5103 0.87438 2.1144 0.56172 0.60414 1.2665 0.8956 2.1144 0.87438zm4.4695 0.2115 3.681 3.6819-1.259 1.284-3.6817-3.7 0.0019784-0.69479-0.090043-0.098846c-0.87973 0.76087-1.92 1.1413-3.1207 1.1413-1.3553 0-2.5025-0.46363-3.4417-1.3909s-1.4088-2.0686-1.4088-3.4239c0-1.3553 0.4696-2.4966 1.4088-3.4239 0.9392-0.92727 2.0864-1.3969 3.4417-1.4088 1.3553-0.011889 2.4906 0.45771 3.406 1.4088 0.9154 0.95107 1.379 2.0924 1.3909 3.4239 0 1.2126-0.38043 2.2588-1.1413 3.1385l0.098834 0.090049z">
              </path>
            </svg></button></td>
        <td class="gsc-clear-button">
          <div class="gsc-clear-button" title="clear results">&nbsp;</div>
        </td>
      </tr>
    </tbody>
  </table>
</form>

Name: I_loginform — POST /user/access.cgi

<form name="I_loginform" method="POST" action="/user/access.cgi" style="display: none;">
  <div class="fields"><input type="hidden" name="w" value="login"><input type="hidden" name="y" value="1"><input type="hidden" name="to" value="https://cplusplus.com/reference/chrono/duration/duration/">user name: <input type="text" name="l" id="l"
      class="txt" size="8" title="Type user name"><br>password: <input type="password" name="p" id="p" class="txt" size="8" title="Type password"><br><input type="checkbox" name="rememberme" value="1" class="chk" id="rememberme"><label
      for="rememberme"></label><input type="submit" class="rbtn" value="sign in">
    <div class="forgot"><a href="/user/access.cgi?w=lostpass">Forgot your password?</a></div>
  </div>
</form>

Text Content

cplusplus.com
 * TUTORIALS
 * REFERENCE
 * ARTICLES
 * FORUM

×

search
 

user name:
password:

Forgot your password?


please wait

try again cancel
forgot your password?

sign up log in
[Legacy version]


C++

 * Tutorials
 * Reference
 * Articles
 * Forum


REFERENCE

 * C LIBRARY:
   
    * 
      <cassert> (assert.h)
    * 
      <cctype> (ctype.h)
    * 
      <cerrno> (errno.h)
    * C++11
      <cfenv> (fenv.h)
    * 
      <cfloat> (float.h)
    * C++11
      <cinttypes> (inttypes.h)
    * 
      <ciso646> (iso646.h)
    * 
      <climits> (limits.h)
    * 
      <clocale> (locale.h)
    * 
      <cmath> (math.h)
    * 
      <csetjmp> (setjmp.h)
    * 
      <csignal> (signal.h)
    * 
      <cstdarg> (stdarg.h)
    * C++11
      <cstdbool> (stdbool.h)
    * 
      <cstddef> (stddef.h)
    * C++11
      <cstdint> (stdint.h)
    * 
      <cstdio> (stdio.h)
    * 
      <cstdlib> (stdlib.h)
    * 
      <cstring> (string.h)
    * C++11
      <ctgmath> (tgmath.h)
    * 
      <ctime> (time.h)
    * C++11
      <cuchar> (uchar.h)
    * 
      <cwchar> (wchar.h)
    * 
      <cwctype> (wctype.h)

 * CONTAINERS:
   
    * C++11
      <array>
    * 
      <deque>
    * C++11
      <forward_list>
    * 
      <list>
    * 
      <map>
    * 
      <queue>
    * 
      <set>
    * 
      <stack>
    * C++11
      <unordered_map>
    * C++11
      <unordered_set>
    * 
      <vector>

 * INPUT/OUTPUT:
   
    * 
      <fstream>
    * 
      <iomanip>
    * 
      <ios>
    * 
      <iosfwd>
    * 
      <iostream>
    * 
      <istream>
    * 
      <ostream>
    * 
      <sstream>
    * 
      <streambuf>

 * MULTI-THREADING:
   
    * C++11
      <atomic>
    * C++11
      <condition_variable>
    * C++11
      <future>
    * C++11
      <mutex>
    * C++11
      <thread>

 * OTHER:
   
    * 
      <algorithm>
    * 
      <bitset>
    * C++11
      <chrono>
    * C++11
      <codecvt>
    * 
      <complex>
    * 
      <exception>
    * 
      <functional>
    * C++11
      <initializer_list>
    * 
      <iterator>
    * 
      <limits>
    * 
      <locale>
    * 
      <memory>
    * 
      <new>
    * 
      <numeric>
    * C++11
      <random>
    * C++11
      <ratio>
    * C++11
      <regex>
    * 
      <stdexcept>
    * 
      <string>
    * C++11
      <system_error>
    * C++11
      <tuple>
    * C++11
      <type_traits>
    * C++11
      <typeindex>
    * 
      <typeinfo>
    * 
      <utility>
    * 
      <valarray>

 * 
   <algorithm>
 * 
   <bitset>
 * 
   <cassert> (assert.h)
 * 
   <cctype> (ctype.h)
 * 
   <cerrno> (errno.h)
 * 
   <cfloat> (float.h)
 * 
   <ciso646> (iso646.h)
 * 
   <climits> (limits.h)
 * 
   <clocale> (locale.h)
 * 
   <cmath> (math.h)
 * 
   <complex>
 * 
   <csetjmp> (setjmp.h)
 * 
   <csignal> (signal.h)
 * 
   <cstdarg> (stdarg.h)
 * 
   <cstddef> (stddef.h)
 * 
   <cstdio> (stdio.h)
 * 
   <cstdlib> (stdlib.h)
 * 
   <cstring> (string.h)
 * 
   <ctime> (time.h)
 * 
   <cwchar> (wchar.h)
 * 
   <cwctype> (wctype.h)
 * 
   <deque>
 * 
   <exception>
 * 
   <fstream>
 * 
   <functional>
 * 
   <iomanip>
 * 
   <ios>
 * 
   <iosfwd>
 * 
   <iostream>
 * 
   <istream>
 * 
   <iterator>
 * 
   <limits>
 * 
   <list>
 * 
   <locale>
 * 
   <map>
 * 
   <memory>
 * 
   <new>
 * 
   <numeric>
 * 
   <ostream>
 * 
   <queue>
 * 
   <set>
 * 
   <sstream>
 * 
   <stack>
 * 
   <stdexcept>
 * 
   <streambuf>
 * 
   <string>
 * 
   <typeinfo>
 * 
   <utility>
 * 
   <valarray>
 * 
   <vector>
 * C++11
   <array>
 * C++11
   <atomic>
 * C++11
   <cfenv> (fenv.h)
 * C++11
   <chrono>
 * C++11
   <cinttypes> (inttypes.h)
 * C++11
   <codecvt>
 * C++11
   <condition_variable>
 * C++11
   <cstdbool> (stdbool.h)
 * C++11
   <cstdint> (stdint.h)
 * C++11
   <ctgmath> (tgmath.h)
 * C++11
   <cuchar> (uchar.h)
 * C++11
   <forward_list>
 * C++11
   <future>
 * C++11
   <initializer_list>
 * C++11
   <mutex>
 * C++11
   <random>
 * C++11
   <ratio>
 * C++11
   <regex>
 * C++11
   <system_error>
 * C++11
   <thread>
 * C++11
   <tuple>
 * C++11
   <type_traits>
 * C++11
   <typeindex>
 * C++11
   <unordered_map>
 * C++11
   <unordered_set>


<CHRONO>

 * CLASSES
   
    * C++11
      common_type (duration)
    * C++11
      common_type (time_point)
    * C++11
      duration
    * C++11
      duration_values
    * C++11
      high_resolution_clock
    * C++11
      steady_clock
    * C++11
      system_clock
    * C++11
      time_point
    * C++11
      treat_as_floating_point

 * FUNCTIONS
   
    * C++11
      duration_cast
    * C++11
      time_point_cast

 * CLASS TYPEDEFS
   
    * C++11
      hours
    * C++11
      microseconds
    * C++11
      milliseconds
    * C++11
      minutes
    * C++11
      nanoseconds
    * C++11
      seconds

 * C++11
   common_type (duration)
 * C++11
   common_type (time_point)
 * C++11
   duration
 * C++11
   duration_cast
 * C++11
   duration_values
 * C++11
   high_resolution_clock
 * C++11
   hours
 * C++11
   microseconds
 * C++11
   milliseconds
 * C++11
   minutes
 * C++11
   nanoseconds
 * C++11
   seconds
 * C++11
   steady_clock
 * C++11
   system_clock
 * C++11
   time_point
 * C++11
   time_point_cast
 * C++11
   treat_as_floating_point


DURATION

 * C++11
   duration::~duration
 * C++11
   duration::duration
 * C++11
   duration operators

 * MEMBER FUNCTIONS
   
    * C++11
      duration::count

 * STATIC MEMBER FUNCTIONS
   
    * C++11
      duration::max
    * C++11
      duration::min
    * C++11
      duration::zero

 * C++11
   duration operators
 * C++11
   duration::count
 * C++11
   duration::duration
 * C++11
   duration::max
 * C++11
   duration::min
 * C++11
   duration::zero
 * C++11
   duration::~duration



 * Reference
 * <chrono>
 * duration
 * duration


public member function
<chrono>


STD::CHRONO::DURATION::DURATION

(1)

duration() = default;

(2)

duration (const duration& dtn);

(3)

template<class Rep2, class Period2>constexpr duration (const duration<Rep2,Period2>& dtn);

(4)

template<class Rep2>constexpr explicit duration (const Rep2& n);

Construct duration object
Constructs a duration object:
default constructor (1) Constructs an object, with a default-initialized count
value. from duration object (2), (3) Initializes the object to a duration of
dtn. from representation (4) Initializes the object to a duration whose count is
n.

The initialization constructors (3) and (4) are only called when the Rep2 type
is not wider than the rep type used in the newly constructed duration object
(and cannot cause implicit truncation errors).

In this regard, if the treat_as_floating_point value for rep is true, Rep2 is
never considered wider.

In order to force a conversion between duration types no matter their
precisions, even if this can cause a truncation, you can use duration_cast.




PARAMETERS

dtn Another duration object.
duration<Rep2,Period2> is a type that cannot cause an implicit truncation error
when converted.
n The count value.
Rep2 is an arithmetic type (or a class emulating an arithmetic type).




EXAMPLE

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24


// duration constructor
#include <iostream>
#include <ratio>
#include <chrono>

int main ()
{
  typedef std::chrono::duration<int> seconds_type;
  typedef std::chrono::duration<int,std::milli> milliseconds_type;
  typedef std::chrono::duration<int,std::ratio<60*60>> hours_type;

  hours_type h_oneday (24);                  // 24h
  seconds_type s_oneday (60*60*24);          // 86400s
  milliseconds_type ms_oneday (s_oneday);    // 86400000ms

  seconds_type s_onehour (60*60);            // 3600s
//hours_type h_onehour (s_onehour);          // NOT VALID (type truncates), use:
  hours_type h_onehour (std::chrono::duration_cast<hours_type>(s_onehour));
  milliseconds_type ms_onehour (s_onehour);  // 3600000ms (ok, no type truncation)

  std::cout << ms_onehour.count() << "ms in 1h" << std::endl;

  return 0;
}

Edit & run on cpp.sh

Output:


3600000ms in 1h





SEE ALSO

duration_castDuration cast (function template)duration::countGet count (public
member function)


Home page | Privacy policy
© cplusplus.com, 2000-2023 - All rights reserved - v3.3.4s
Spotted an error? contact us

x