std::money_get

 

C++

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Technical specifications

Symbols index

External libraries

 

Localization library

Locales and facets
Locales
has_facet use_facet	locale
Facet category base classes
ctype_base codecvt_base messages_base	time_base money_base
ctype facets
ctype ctype<char> ctype_byname	codecvt codecvt_byname
numeric facets
num_get num_put	numpunct numpunct_byname
collate facets
collate	collate_byname
time facets
time_get time_put	time_get_byname time_put_byname
monetary facets
money_get money_put	moneypunct moneypunct_byname
messages facets
messages	messages_byname

Character classification and conversion
Character classification
isspace isblank (C++11) iscntrl	isupper islower isalpha	ispunct isdigit isxdigit	isalnum isprint isgraph

Character conversions

toupper

tolower

String and stream conversions

wstring_convert (C++11/17/26*)

wbuffer_convert (C++11/17/26*)

Text encoding identifications

text_encoding (C++26)

Unicode conversion facets

codecvt_utf8 (C++11/17/26*)

codecvt_utf16 (C++11/17/26*)

codecvt_utf8_utf16 (C++11/17/26*)

codecvt_mode (C++11/17/26*)

C library locales
LC_ALLLC_COLLATELC_CTYPELC_MONETARYLC_NUMERICLC_TIME	setlocale localeconv lconv

 

std::money_get

Member functions

money_get::money_get

money_get::~money_get

money_get::getmoney_get::do_get

 

Defined in header <locale>
template<     class CharT,     class InputIt = std::istreambuf_iterator<CharT> > class money_get;

Class template std::money_get encapsulates the rules for parsing monetary values from character streams. The standard I/O manipulator std::get_money uses the std::money_get facet of the I/O stream's locale.

Inheritance diagram

If a std::money_get specialization is not guaranteed to be provided by the standard library (see below), the behaviors of its get() and do_get() are not guaranteed as specified.

Specializations

The standard library is guaranteed to provide the following specializations (they are required to be implemented by any locale object):

Defined in header <locale>
std::money_get<char>	parses narrow string representations of monetary values
std::money_get<wchar_t>	parses wide string representations of monetary values

In addition, the standard library is also guaranteed to provide every specialization that satisfies the following type requirements:

• CharT is one of
  • char,
  • wchar_t, and
  • any other implementation-defined character container type that meets the requirements for a character on which any of the iostream components can be instantiated; and
• InputIt must meet the requirements of LegacyInputIterator.

Member types

Member type	Definition
char_type	CharT
string_type	std::basic_string<CharT>
iter_type	InputIt

Member functions

(constructor)	constructs a new money_get facet (public member function)
get	invokes do_get (public member function)

Protected member functions

(destructor)	destructs a money_get facet (protected member function)
do_get [virtual]	parses a monetary value from an input stream (virtual protected member function)

Member objects

static std::locale::id id

id of the locale (public member object)

Example

Run this code

#include <iomanip>
#include <iostream>
#include <iterator>
#include <locale>
#include <sstream>
 
int main()
{
    std::string str = "$1.11 $2.22 $3.33";
    std::cout << std::fixed << std::setprecision(2);
 
    std::cout << '\"' << str << "\" parsed with the I/O manipulator: ";
    std::istringstream s1(str);
    s1.imbue(std::locale("en_US.UTF-8"));
 
    long double val;
    while (s1 >> std::get_money(val))
        std::cout << val / 100 << ' ';
    std::cout << '\n';
 
    str = "USD  1,234.56";
    std::cout << '\"' << str << "\" parsed with the facet directly: ";
    std::istringstream s2(str);
    s2.imbue(std::locale("en_US.UTF-8"));
 
    auto& f = std::use_facet<std::money_get<char>>(s2.getloc());
    std::ios_base::iostate err;
    std::istreambuf_iterator<char> beg(s2), end;
    f.get(beg, end, true, s2, err, val);
 
    std::cout << val / 100 << '\n';
}

Output:

"$1.11 $2.22 $3.33" parsed with the I/O manipulator: 1.11 2.22 3.33
"USD  1,234.56" parsed with the facet directly: 1234.56

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 427	C++98	money_get was guaranteed to accept any CharT that meets the requirements for a character on which any of the iostream components can be instantiated	only guarantees to accept char, wchar_t and other implementation- defined character types
LWG 2392	C++98	only character type CharT could be guaranteed to be accepted by money_get	can guarantee to accept implementation- defined character container types

See also

moneypunct	defines monetary formatting parameters used by std::money_get and std::money_put (class template)
money_put	formats a monetary value for output as a character sequence (class template)
get_money (C++11)	parses a monetary value (function template)