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FLT_EVAL_METHOD

FLT[医]埃瓦尔[医]方法

Defined in header ​​
#define FLT_EVAL_METHOD /* implementation defined */​(since C++11)

指定执行除赋值和强制转换以外的所有浮点算术操作的精度。

ValueExplanation
negative values except -1implementation-defined behavior
-1the default precision is not known
0all operations and constants evaluate in the range and precision of the type used. Additionally, float_t and double_t are equivalent to float and double respectively
1all operations and constants evaluate in the range and precision of double. Additionally, both float_t and double_t are equivalent to double
2all operations and constants evaluate in the range and precision of long double. Additionally, both float_t and double_t are equivalent to long double

注记

不管…的价值FLT_EVAL_METHOD，任何浮点表达式都可能是承包，也就是说，如果所有中间结果都有无限的范围和精度，除非#语用STDC FP_CONTRACT关闭%29。

转换和赋值剥离任何无关的范围和精度：这是一种将值从扩展精度FPU寄存器存储到标准大小的内存位置的行为模型。

另见

C.FLT文件[医]埃瓦尔[医]方法

*。

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