std::numeric_limits<T>::has_denorm
来自cppreference.com
                    
                                        
                    < cpp | types | numeric limits
                    
                                                            
                    | static const std::float_denorm_style has_denorm; | (C++11 前) | |
| static constexpr std::float_denorm_style has_denorm; | (C++11 起) | |
std::numeric_limits<T>::has_denorm 的值鉴别浮点类型如何支持非正规值。
标准特化
| T | std::numeric_limits<T>::has_denorm 的值 | 
| /* non-specialized */ | std::denorm_absent | 
| bool | std::denorm_absent | 
| char | std::denorm_absent | 
| signed char | std::denorm_absent | 
| unsigned char | std::denorm_absent | 
| wchar_t | std::denorm_absent | 
| char8_t | std::denorm_absent | 
| char16_t | std::denorm_absent | 
| char32_t | std::denorm_absent | 
| short | std::denorm_absent | 
| unsigned short | std::denorm_absent | 
| int | std::denorm_absent | 
| unsigned int | std::denorm_absent | 
| long | std::denorm_absent | 
| unsigned long | std::denorm_absent | 
| long long | std::denorm_absent | 
| unsigned long long | std::denorm_absent | 
| float | 通常为 std::denorm_present | 
| double | 通常为 std::denorm_present | 
| long double | 通常为 std::denorm_present | 
参阅
| [静态] | 返回给定浮点类型的最小正非正规值 (公开静态成员函数) | 
| 指示浮点非规格化模式 (枚举) | 
 
	