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std::moneypunct<CharT,International>:: thousands_sep, do_thousands_sep

From cppreference.net
定义于头文件 <locale>
public :
char_type thousands_sep ( ) const ;
(1)
protected :
virtual char_type do_thousands_sep ( ) const ;
(2)
1) 公开成员函数,调用最派生类的成员函数 do_thousands_sep
2) 返回在解析或格式化货币值的整数部分时,用作数字组分隔符的字符。

返回值

用于作为千位分隔符的 char_type 类型对象。在常见的美国区域设置中,该字符为 ',' L ','

示例

#include <iomanip>
#include <iostream>
#include <iterator>
#include <locale>
struct space_out : std::moneypunct<char>
{
    pattern do_pos_format() const { return {value, none, none, none}; }
    int do_frac_digits() const { return 0; }
    char_type do_thousands_sep() const { return ' '; }
    string_type do_grouping() const { return "\002"; }
};
int main()
{
    std::cout.imbue(std::locale("en_US.UTF-8"));
    std::cout << "american locale: " << std::showbase
              << std::put_money(12345678.0) << '\n';
    std::cout.imbue(std::locale(std::cout.getloc(), new space_out));
    std::cout << "locale with modified moneypunct: "
              << std::put_money(12345678.0) << '\n';
}

输出:

american locale: $123,456.78
locale with modified moneypunct: 12 34 56 78

参阅

[virtual]
提供每对千位分隔符之间的数字位数
(虚受保护成员函数)