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std::numeric_limits::traps

STD：：数字[医]限制：：陷阱

static const bool traps​(until C++11)
static constexpr bool traps​(since C++11)

价值std::numeric_limits<T>::traps是true所有算术类型T如果用作算术操作的参数，则至少有一个值将生成陷阱%28http：//en.wikipara.com/wiki/trap_%28计算%29%29...

标准专业化

Tvalue of std::numeric_limits::traps
/* non-specialized */false
boolfalse
charusually true
signed charusually true
unsigned charusually true
wchar_tusually true
char16_tusually true
char32_tusually true
shortusually true
unsigned shortusually true
intusually true
unsigned intusually true
longusually true
unsigned longusually true
long longusually true
unsigned long longusually true
floatusually false
doubleusually false
long doubleusually false

注记

在大多数平台上，整数除以零总是陷阱，std::numeric_limits<T>::traps是true对于所有支持值0的整数类型。例外情况是bool*即使除法false由于积分提升而产生的陷阱bool到int，它是零值的。int那个陷阱。0不是类型的值。bool...

在大多数平台上，浮点异常可能在运行时(%28等)被打开或关闭。feenableexcept()在Linux或_controlfp在Windows%29上，在这种情况下，std::numeric_limits<T>::traps对于浮点类型，反映程序启动时浮点捕获设备的状态，即false在大多数现代系统中。一个例外是一个DEC Alpha程序，在这里它是true如果编译没有-ieee...

另见

浮点环境

*。

淡淡[医]以前静态标识浮点类型，在舍入%28公共静态成员常量%29之前检测微小性。

有[医]脱诺姆[医]损失静态将检测精度损失的浮点类型标识为非正态化损失，而不是不精确的结果%28公共静态成员常量%29。

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/type/NUMERIC[医]限制/陷阱

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