类模板
<locale>
std::numpunct
template <class charT> class numpunct;
数字标点符 (Numeric punctuation facet)
The numpunct standard facet provides information about the format of punctuation marks for numbers and also the strings to represent the true and false boolean values.
The numpunct class template has a protected destructor: Programs shall only construct objects of derived classes, or use those installed in locale objects (through use_facet).
All standard locale objects support at least the following facet instantiations of the numpunct class template as part of the numeric category
| facets in locale objects | 描述 |
|---|
numpunct<char> | narrow characters |
numpunct<wchar_t> | wide characters |
模板参数
- charT
- 字符类型。
This is the type of the representation, not the type of the numerical value: the formatting information is common for all numeric types.
Aliased as member char_type.
成员常量
The class contains a public static constant of type locale::id that uniquely identifies facets with numpunct semantics.
公开成员函数
- （构造函数）
- numpunct 构造函数 (public member function)
Numerical format
- decimal_point
- Decimal point character (public member function)
- thousands_sep
- 千位分隔符字符 (public member function)
- grouping
- Grouping of digits (public member function)
Boolean values
- truename
- true 的字符串表示 (public member function)
- falsename
- String representation of false (public member function)
虚保护成员函数
The class defines the virtual protected members which implement the behavior by default of their respective member functions
- do_decimal_point
- Return decimal point character [virtual] (protected virtual member function)
- do_thousands_sep
- Return thousands separator character [virtual] (protected virtual member function)
- do_grouping
- Return grouping of digits [virtual] (protected virtual member function)
- do_truename
- Return string representing true [virtual] (protected virtual member function)
- do_falsename
- Return string representing false [virtual] (protected virtual member function)
Along with the class destructor
- (析构函数)
- numpunct destructor (protected member function)
Specializations
At least the following specializations of this template are provided in all library implementations
| 特化 |
|---|
numpunct<char> |
numpunct<wchar_t> |