FLT_EVAL_METHOD
From cppreference.com
C++
Utilities library
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Type support
| Basic types | |||||||||||||||||||||
| Fixed width integer types (C++11) | |||||||||||||||||||||
| Fixed width floating-point types (C++23) | |||||||||||||||||||||
|
|||||||||||||||||||||
| Numeric limits | |||||||||||||||||||||
| C numeric limits interface | |||||||||||||||||||||
| Runtime type information | |||||||||||||||||||||
|
|||||||||||||||||||||
C numeric limits interface
|
FLT_EVAL_METHOD
(C++11)
|
|
Defined in header
<cfloat>
|
||
|
#define FLT_EVAL_METHOD /* implementation defined */
|
(since C++11) | |
Specifies the precision in which all floating-point arithmetic operations other than assignment and cast are done.
| Value | Explanation |
negative values except
-1
|
implementation-defined behavior |
-1
|
the default precision is not known |
0
|
all 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 |
1
|
all operations and constants evaluate in the range and precision of double . Additionally, both float_t and double_t are equivalent to double |
2
|
all operations and constants evaluate in the range and precision of long double . Additionally, both float_t and double_t are equivalent to long double |
Notes
Regardless of the value of FLT_EVAL_METHOD , any floating-point expression may be contracted , that is, calculated as if all intermediate results have infinite range and precision (unless #pragma STDC FP_CONTRACT is off)
Cast and assignment strip away any extraneous range and precision: this models the action of storing a value from an extended-precision FPU register into a standard-sized memory location.
See also
|
C documentation
for
FLT_EVAL_METHOD
|
Retrieved from "
https://en.cppreference.com/mwiki/index.php?title=cpp/types/climits/FLT_EVAL_METHOD&oldid=76871
"