std::moneypunct::frac_digits, do_frac_digits

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

Localizations library

Locales and facets
locale
use_facet	has_facet
Character classification
isspace isblank (C++11) iscntrl isupper islower isalpha	isdigit ispunct isxdigit isalnum isprint isgraph
Conversions
toupper tolower	wstring_convert (C++11) wbuffer_convert (C++11)
Facet category base classes
ctype_base codecvt_base messages_base	time_base money_base
Facet categories
ctype ctype<char> codecvt collate messages time_get time_put	num_get num_put numpunct money_get money_put moneypunct
Locale-specific facets
ctype_byname codecvt_byname messages_byname collate_byname	time_get_byname time_put_byname numpunct_byname moneypunct_byname
Code conversion facets
codecvt_utf8 (C++11) codecvt_utf16 (C++11)	codecvt_utf8_utf16 (C++11) codecvt_mode (C++11)
C locale
setlocale localeconv lconv	LC_ALLLC_COLLATELC_CTYPELC_MONETARYLC_NUMERICLC_TIME

std::moneypunct

Member functions

moneypunct::moneypunct

moneypunct::~moneypunct

moneypunct::decimal_pointmoneypunct::do_decimal_point

moneypunct::thousands_sepmoneypunct::do_thousands_sep

moneypunct::groupingmoneypunct::do_grouping

moneypunct::curr_symbolmoneypunct::do_curr_symbol

moneypunct::frac_digitsmoneypunct::do_frac_digits

moneypunct::positive_signmoneypunct::do_positive_signmoneypunct::negative_signmoneypunct::do_negative_sign

moneypunct::pos_formatmoneypunct::do_pos_formatmoneypunct::neg_formatmoneypunct::do_neg_format

Defined in header <locale>
public: int frac_digits() const;	(1)
protected: virtual int do_frac_digits() const;	(2)

1) Public member function, calls the member function do_frac_digits of the most derived class.

2) Returns the number of digits to be displayed after the decimal point when printing monetary values

Return value

The number of digits to be displayed after the decimal point. In common U.S. locales, this is the value 2.

Example

Run this code

#include <locale>
#include <iostream>
#include <iomanip>
#include <iterator>
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';
}

Output:

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

See also

do_thousands_sep [virtual]	provides the character to use as thousands separator (virtual protected member function)
do_decimal_point [virtual]	provides the character to use as decimal point (virtual protected member function)