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std::fegetenv, std::fesetenv

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 fegetenv( std::fenv_t* envp )
(1) (C++11およびそれ以降)
int fesetenv( const std::fenv_t* envp );
(2) (C++11およびそれ以降)
1)
envpが指すオブジェクトに、浮動小数点環境のステータスを格納しようとします
Original:
Attempts to store the status of the floating-point environment in the object pointed to by envp.
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2)
envpが指すオブジェクトから浮動小数点環境を確立しようとします。そのオブジェクトの値は、以前std::feholdexceptへのコールによって取得またはstd::fegetenvまたは浮動小数点マクロ定数である必要があります。浮動小数点ステータスフラグのいずれかがenvpに設定されている場合、彼らは(実行が中断しない)(そしてstd::fetestexceptによって検証可能である)環境で設定となっているが、対応する浮動小数点例外は発生しません
Original:
Attempts to establish the floating-point environment from the object pointed to by envp. The value of that object must be previously obtained by a call to std::feholdexcept or std::fegetenv or be a floating-point macro constant. If any of the floating-point status flags are set in envp, they become set in the environment (and are then testable with std::fetestexcept), but the corresponding floating-point exceptions are not raised (execution continues uninterrupted)
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[編集] パラメータ

envp -
浮動小数点環境のステータスを保持するタイプstd::fenv_tのオブジェクトへのポインタ.
Original:
pointer to the object of type std::fenv_t which holds the status of the floating-point environment
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[編集] 値を返します

0成功した場合には、ゼロ以外のその他のとき.
Original:
0 on success, non-zero otherwise.
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[編集] も参照してください

環境を保存し、すべてのステータスフラグをクリアし、今後のすべてのエラーを無視します
Original:
saves the environment, clears all status flags and ignores all future errors
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(関数) [edit]
浮動小数点環境を復元し、以前に例外を発生させることが発生します
Original:
restores the floating-point environment and raises the previously raise exceptions
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(関数) [edit]
デフォルトの浮動小数点環境
Original:
default floating-point environment
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(マクロ定数) [edit]