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std::numpunct

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Defined in header <locale>
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template< class CharT >
class numpunct;
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The facet std::numpunct encapsulates numeric punctuation preferences. Stream I/O operations use std::numpunct through std::num_get and std::num_put for parsing numeric input and formatting numeric output.

cpp/locale/locale/facetstd-numpunct-inheritance.svg
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Inheritance diagram

Two specializations are provided by the standard library

Defined in header <locale>
std::numpunct<char> provides equivalents of the "C" locale preferences
std::numpunct<wchar_t> provides wide character equivalents of the "C" locale preferences

Contents

Member types

Member type Definition
char_type charT
string_type std::basic_string<charT>

Member functions

Template:cpp/locale/numpunct/dcl list numpunctTemplate:cpp/locale/numpunct/dcl list ~numpunctTemplate:cpp/locale/numpunct/dcl list decimal pointTemplate:cpp/locale/numpunct/dcl list thousands sepTemplate:cpp/locale/numpunct/dcl list groupingTemplate:cpp/locale/numpunct/dcl list truenameTemplate:cpp/locale/numpunct/dcl list falsename

Protected member functions

Template:cpp/locale/numpunct/dcl list do decimal pointTemplate:cpp/locale/numpunct/dcl list do thousands sepTemplate:cpp/locale/numpunct/dcl list do groupingTemplate:cpp/locale/numpunct/dcl list do truenameTemplate:cpp/locale/numpunct/dcl list do falsename

Member objects

static std::locale::id id
id of the locale
(public member object)

Example

The following example changes the string representations of true and false

#include <iostream>
#include <locale>
 
struct french_bool : std::numpunct<char> {
    string_type do_truename() const { return "oui"; }
    string_type do_falsename() const { return "non"; }
};
 
int main()
{
    std::cout << "default locale: "
              << std::boolalpha << true << ", " << false << '\n';
    std::cout.imbue(std::locale(std::cout.getloc(), new french_bool()));
    std::cout << "locale with modified numpunct: "
              << std::boolalpha << true << ", " << false << '\n';
}

Output:

default locale: true, false
locale with modified numpunct: oui, non

See also

creates a numpunct facet for the named locale
(class template)