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std::numeric_limits::traps

提供: cppreference.com

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
支援を入力します
基本的なタイプ
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Basic types
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基本的なタイプ
固定幅の整数型 (C++11)
数値の限界
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Numeric limits
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numeric_limits
Cの数値は、インターフェイスを制限します
実行時型情報
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Runtime type information
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型の特徴
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Type traits
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プライマリタイプカテゴリ
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Typeプロパティ
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
サポートされる操作
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
リレーションシップとプロパティクエリ
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
型の変更
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Type modifications
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remove_cv
remove_const
remove_volatile
(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
型変換
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
形質定数を入力します
Original:
Type trait constants
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integral_constant(C++11)
 
 
static const bool traps
(C + + 11時まで)
static constexpr bool traps
(C + + 11以来)
std::numeric_limits<T>::trapsの値は、すべての算術型であるためtrueT、算術演算の引数として使用されている場合、トラップを生成する少なくとも1つの値が、その.
Original:
The value of std::numeric_limits<T>::traps is true for all arithmetic types T that have at least one value that, if used as an argument to an arithmetic operation, will generate a トラップ.
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[編集] 標準の専門分野

T
std::numeric_limits<T>::trapsの値
Original:
value of std::numeric_limits<T>::traps
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/* non-specialized */ false
bool false
char
通常true
Original:
usually true
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signed char
通常true
Original:
usually true
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unsigned char
通常true
Original:
usually true
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wchar_t
通常true
Original:
usually true
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char16_t
通常true
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usually true
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char32_t
通常true
Original:
usually true
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short
通常true
Original:
usually true
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unsigned short
通常true
Original:
usually true
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int
通常true
Original:
usually true
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unsigned int
通常true
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usually true
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long
通常true
Original:
usually true
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unsigned long
通常true
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usually true
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long long
通常true
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usually true
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unsigned long long
通常true
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usually true
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float
通常false
Original:
usually false
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double
通常false
Original:
usually false
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long double
通常false
Original:
usually false
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[編集] ノート

ほとんどのプラットホームでは常にゼロトラップによる整数除算、およびstd::numeric_limits<T>::trapsは値0をサポートしているすべての整数型にtrueです。例外は型boolです:falseからboolに不可欠な推進のためにintトラップによる除算は、それがゼロ値intそのトラップであっても同様です。ゼロはタイプboolの値ではありません.
Original:
On most platforms integer division by zero always traps, and std::numeric_limits<T>::traps is true for all integer types that support the value 0. The exception is the type bool: even though division by false traps due to integral promotion from bool to int, it is the zero-valued int that traps. Zero is not a value of type bool.
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ほとんどのプラットフォームでは、浮動小数点例外は浮動小数点型のfeenableexcept()の値が浮動小数点トラップ施設の状態でを反映している場合には、(例えば_controlfpWindows上でLinuxまたはstd::numeric_limits<T>::traps上の)実行時にオン·オフすることができる最も近代的なシステム上のfalseあるプログラムの起動の時間。例外はtrueせずにコンパイルした場合、それが-ieeeあるDEC Alphaのプログラムであろう.
Original:
On most platforms, floating-point exceptions may be turned on and off at run time (e.g. feenableexcept() on Linux or _controlfp on Windows), in which case the value of std::numeric_limits<T>::traps for floating-point types reflects the state of floating-point trapping facility at the time of program startup, which is false on most modern systems. An exception would be a DEC Alpha program, where it is true if compiled without -ieee.
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[編集] も参照してください

浮動小数点環境
丸め前tinynessを検出する浮動小数点型を識別します
Original:
identifies floating-point types that detect tinyness before rounding
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(公共の静的メンバ定数) [edit]
identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
(公共の静的メンバ定数) [edit]