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std::feclearexcept

提供: cppreference.com
< cpp‎ | numeric‎ | fenv

 
 
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
 
浮動小数点環境
機能します
Original:
Functions
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feclearexcept(C++11)
fetestexcept(C++11)
feraiseexcept(C++11)
fegetexceptflag
fesetexceptflag
(C++11)
(C++11)
fegetround
fesetround
(C++11)
(C++11)
fegetenv
fesetenv
(C++11)
feholdexcept(C++11)
feupdateenv(C++11)
マクロ定数
Original:
Macro constants
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FE_ALL_EXCEPT
FE_DIVBYZERO
FE_INEXACT
FE_INVALID
FE_OVERFLOW
FE_UNDERFLOW
(C++11)
FE_DOWNWARD
FE_TONEAREST
FE_TOWARDZERO
FE_UPWARD
(C++11)
FE_DFL_ENV(C++11)
 
Defined in header <cfenv>
int feclearexcept( int excepts );
(C + + 11以来)
ビット単位の論理和(OR)exceptsのあるビットマスク引数小数点例外マクロが浮かんでいます、に記載されている浮動小数点例外をクリアしようとすると.
Original:
Attempts to clear the floating-point exceptions that are listed in the bitmask argument excepts, which is a bitwise OR of the 小数点例外マクロが浮かんでいます.
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目次

[編集] パラメータ

excepts -
例外フラグをクリアするためにリストするビットマスク
Original:
bitmask listing the exception flags to clear
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[編集] 値を返します

0exceptsがゼロの場合はすべて、示された例外が正常にクリアされるか、またはされた場合。エラーならば非ゼロの値を返します.
Original:
0 if all indicated exceptions were successfully cleared or if excepts is zero. Returns a non-zero value on error.
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[編集]

[edit]
#include <iostream>
#include <cfenv>
#include <cmath>
 
#pragma STDC FENV_ACCESS ON
 
volatile double zero = 0.0; // volatile not needed where FENV_ACCESS is supported
volatile double one = 1.0;  // volatile not needed where FENV_ACCESS is supported
 
int main()
{
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout <<  "1.0/0.0 = " << 1.0 / zero << '\n';
    if(std::fetestexcept(FE_DIVBYZERO)) {
        std::cout << "division by zero reported\n";
    } else {
        std::cout << "divsion by zero not reported\n";
    }
 
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout << "1.0/10 = " << one/10 << '\n';
    if(std::fetestexcept(FE_INEXACT)) {
        std::cout << "inexact result reported\n";
    } else {
        std::cout << "inexact result not reported\n";
    }
 
    std::feclearexcept(FE_ALL_EXCEPT);
    std::cout << "sqrt(-1) = " << std::sqrt(-1) << '\n';
    if(std::fetestexcept(FE_INVALID)) {
        std::cout << "invalid result reported\n";
    } else {
        std::cout << "invalid result not reported\n";
    }
}

Output:

1.0/0.0 = inf
division by zero reported
1.0/10 = 0.1
inexact result reported
sqrt(-1) = -nan
invalid result reported

[編集] も参照してください

設定されている指定された浮動小数点状態フラグのかを決定します
Original:
determines which of the specified floating-point status flags are set
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(機能) [edit]