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Showing content from https://en.cppreference.com/w/cpp/language/../types/floating-point.html below:

Fixed width floating-point types (since C++23)

If the implementation supports any of the following ISO 60559 types as an extended floating-point type, then:

the corresponding macro is defined as 1 to indicate support,
the corresponding floating-point literal suffix is available, and
the corresponding type alias name is provided:

Types
Defined in header
<stdfloat> Literal suffix Predefined macro C language type Type properties bits of storage bits of precision bits of exponent max exponent float16_t f16 or F16 __STDCPP_FLOAT16_T__ _Float16 16 11 5 15 float32_t f32 or F32 __STDCPP_FLOAT32_T__ _Float32 32 24 8 127 float64_t f64 or F64 __STDCPP_FLOAT64_T__ _Float64 64 53 11 1023 float128_t f128 or F128 __STDCPP_FLOAT128_T__ _Float128 128 113 15 16383 bfloat16_t bf16 or BF16 __STDCPP_BFLOAT16_T__ (N/A) 16 8 8 127 [edit] Notes

The type std::bfloat16_t is known as Brain Floating-Point.

Unlike the fixed width integer types, which may be aliases to standard integer types, the fixed width floating-point types must be aliases to extended floating-point types (not float / double / long double), therefore not drop-in replacements for standard floating-point types.

[edit] Example

#include <stdfloat>
 
#if __STDCPP_FLOAT64_T__ != 1
    #error "64-bit float type required"
#endif
 
int main()
{
    std::float64_t f = 0.1f64;
}

[edit] References

C++23 standard (ISO/IEC 14882:2024):

6.8.3 Optional extended floating-point types [basic.extended.fp]

[edit] See also

Fundamental types

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