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17 Language support library [support]

17.4 Arithmetic types [support.arith.types]

17.4.2 Header <stdfloat> synopsis [stdfloat.syn]

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The header <stdfloat> declares type aliases for the optional extended floating-point types that are specified in [basic.extended.fp].
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namespace std { #if defined(__STDCPP_FLOAT16_T__) using float16_t = implementation-defined; // see [basic.extended.fp] #endif #if defined(__STDCPP_FLOAT32_T__) using float32_t = implementation-defined; // see [basic.extended.fp] #endif #if defined(__STDCPP_FLOAT64_T__) using float64_t = implementation-defined; // see [basic.extended.fp] #endif #if defined(__STDCPP_FLOAT128_T__) using float128_t = implementation-defined; // see [basic.extended.fp] #endif #if defined(__STDCPP_BFLOAT16_T__) using bfloat16_t = implementation-defined; // see [basic.extended.fp] #endif }