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std::ratio

提供: cppreference.com
< cpp‎ | numeric‎ | ratio

 
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
汎用の数値演算
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
時間有理数演算をコンパイルします
ratio(C++11)
算術
Original:
Arithmetic
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ratio_add(C++11)
ratio_subtract(C++11)
ratio_multiply(C++11)
ratio_divide(C++11)
比較
Original:
Comparison
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ratio_equal(C++11)
ratio_not_equal(C++11)
ratio_less(C++11)
ratio_less_equal(C++11)
ratio_greater(C++11)
ratio_greater_equal(C++11)
 
Defined in header <ratio>
template<

    std::intmax_t Num,
    std::intmax_t Denom = 1

> class ratio;
(C++11およびそれ以降)

The class template std::ratio provides compile-time rational arithmetic support. Each instantiation of this template exactly represents any finite rational number as long as its numerator Num and denominator Denom are representable as compile-time constants of type std::intmax_t. In addition, Denom may not be zero and may not be equal to the most negative value. Both numerator and denominator are automatically reduced to the lowest terms.

SIの比率に対応するいくつかの便利なtypedefは標準ライブラリで提供されています
Original:
Several convenience typedefs that correspond to the SI ratios are provided by the standard library:
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Defined in header <ratio>
タイプ
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Type
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Definition
yocto
std::ratio<1, 1000000000000000000000000>std::intmax_tは分母を表すことができます
Original:
std::ratio<1, 1000000000000000000000000>, if std::intmax_t can represent the denominator
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zepto
std::ratio<1, 1000000000000000000000>std::intmax_tは分母を表すことができます
Original:
std::ratio<1, 1000000000000000000000>, if std::intmax_t can represent the denominator
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atto std::ratio<1, 1000000000000000000>
femto std::ratio<1, 1000000000000000>
pico std::ratio<1, 1000000000000>
nano std::ratio<1, 1000000000>
micro std::ratio<1, 1000000>
milli std::ratio<1, 1000>
centi std::ratio<1, 100>
deci std::ratio<1, 10>
deca std::ratio<10, 1>
hecto std::ratio<100, 1>
kilo std::ratio<1000, 1>
mega std::ratio<1000000, 1>
giga std::ratio<1000000000, 1>
tera std::ratio<1000000000000, 1>
peta std::ratio<1000000000000000, 1>
exa std::ratio<1000000000000000000, 1>
zetta
std::ratio<1000000000000000000000, 1>std::intmax_tは分母を表すことができます
Original:
std::ratio<1000000000000000000000, 1>, if std::intmax_t can represent the numerator
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yotta
std::ratio<1000000000000000000000000, 1>std::intmax_tは分母を表すことができます
Original:
std::ratio<1000000000000000000000000, 1>, if std::intmax_t can represent the numerator
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[編集] メンバータイプ

メンバー·タイプ
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Member type
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Definition
type std::ratio<num, den>

[編集] メンバーオブジェクト

constexpr intmax_t num
[静的]
タイプのconstexprstd::intmax_tsign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)に等しい
Original:
constexpr value of type std::intmax_t equal to sign(Num) * sign(Denom) * abs(Num) / gcd(Num, Denom)
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(パブリック静的メンバ定数)
constexpr intmax_t den
[静的]
タイプのconstexprstd::intmax_tabs(Denom) / gcd(Num, Denom)に等しい
Original:
constexpr value of type std::intmax_t equal to abs(Denom) / gcd(Num, Denom)
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(パブリック静的メンバ定数)