less_equal.md

#operator<=

namespace std {
namespace chrono {
  template <class Rep1, class Period1, class Rep2, class Period2>
  constexpr bool operator<=(const duration<Rep1, Period1>& lhs,
                            const duration<Rep2, Period2>& rhs);

  template <class Clock, class Duration1, class Duration2>
  bool operator<=(const time_point<Clock, Duration1>& lhs,
                  const time_point<Clock, Duration2>& rhs);
}}

• duration[link /reference/chrono/duration.md]
• time_point[link /reference/chrono/time_point.md]

##概要 左辺が右辺以下かの判定を行う

##戻り値

• duration
  2つのdurationの単位を合わせた上でcount()の比較を行う。
  typedef common_type<decltype(lhs), decltype(rhs)>::type ct;
ct(lhs).count() <= ct(rhs).count()
• time_point
lhs.time_since_epoch() <= rhs.time_since_poch()

##例

#include <cassert>
#include <chrono>

using namespace std::chrono;

int main()
{
  // duration同士の比較
  {
    const bool result = seconds(3) <= seconds(3);
    assert(result);
  }

  // time_point同士の比較
  {
    time_point<system_clock> p1(seconds(3));
    time_point<system_clock> p2(seconds(3));

    const bool result = p1 <= p2;
    assert(result);
  }
}

###出力

##バージョン ###言語

• C++11

###処理系

• GCC, C++0x mode: 4.6.1