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cppdraft/locale/moneypunct/general.md
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cppdraft/locale/moneypunct/general.md
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[locale.moneypunct.general]
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# 28 Text processing library [[text]](./#text)
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## 28.3 Localization library [[localization]](localization#locale.moneypunct.general)
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### 28.3.4 Standard locale categories [[locale.categories]](locale.categories#locale.moneypunct.general)
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#### 28.3.4.7 The monetary category [[category.monetary]](category.monetary#locale.moneypunct.general)
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#### 28.3.4.7.4 Class template moneypunct [[locale.moneypunct]](locale.moneypunct#general)
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#### 28.3.4.7.4.1 General [locale.moneypunct.general]
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[ð](#lib:moneypunct)
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namespace std {class money_base {public:enum part { none, space, symbol, sign, value }; struct pattern { char field[4]; }; }; template<class charT, bool International = false>class moneypunct : public locale::facet, public money_base {public:using char_type = charT; using string_type = basic_string<charT>; explicit moneypunct(size_t refs = 0);
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charT decimal_point() const;
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charT thousands_sep() const;
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string grouping() const;
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string_type curr_symbol() const;
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string_type positive_sign() const;
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string_type negative_sign() const; int frac_digits() const;
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pattern pos_format() const;
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pattern neg_format() const; static locale::id id; static const bool intl = International; protected:~moneypunct(); virtual charT do_decimal_point() const; virtual charT do_thousands_sep() const; virtual string do_grouping() const; virtual string_type do_curr_symbol() const; virtual string_type do_positive_sign() const; virtual string_type do_negative_sign() const; virtual int do_frac_digits() const; virtual pattern do_pos_format() const; virtual pattern do_neg_format() const; };}
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4465)
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The moneypunct<> facet defines monetary formatting parameters
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used by money_get<> and money_put<>[.](#1.sentence-1)
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A monetary format is a sequence of four components,
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specified by a pattern value p,
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such that the part value static_cast<part>(p.field[i]) determines the ith component of the format[.](#1.sentence-2)[230](#footnote-230 "An array of char, rather than an array of part, is specified for pattern::field purely for efficiency.")
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In the field member of a pattern object,
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each value symbol, sign, value, and
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either space or none appears exactly once[.](#1.sentence-3)
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The value none, if present, is not first;
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the value space, if present, is neither first nor last[.](#1.sentence-4)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4484)
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Where none or space appears,
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whitespace is permitted in the format,
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except where none appears at the end,
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in which case no whitespace is permitted[.](#2.sentence-1)
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The value space indicates that
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at least one space is required at that position[.](#2.sentence-2)
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Where symbol appears,
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the sequence of characters returned by curr_symbol() is permitted, and
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can be required[.](#2.sentence-3)
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Where sign appears,
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the first (if any) of the sequence of characters returned bypositive_sign() or negative_sign() (respectively as the monetary value is non-negative or negative) is required[.](#2.sentence-4)
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Any remaining characters of the sign sequence are required after
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all other format components[.](#2.sentence-5)
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Where value appears, the absolute numeric monetary value is required[.](#2.sentence-6)
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4502)
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The format of the numeric monetary value is a decimal number:
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value :
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units fractionalopt
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decimal-point digits
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fractional :
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decimal-point digitsopt
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if frac_digits() returns a positive value, or
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value :
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units
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otherwise[.](#3.sentence-1)
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The symbol *decimal-point* indicates the character returned by decimal_point()[.](#3.sentence-2)
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The other symbols are defined as follows:
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units :
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digits
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digits thousands-sep units
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digits :
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adigit digitsopt
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In the syntax specification,
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the symbol *adigit* is any of the values ct.widen(c) for c in the range '0' through '9' (inclusive) andct is a reference of type const ctype<charT>& obtained as described in the definitions
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of money_get<> and money_put<>[.](#3.sentence-4)
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The symbol *thousands-sep* is the character returned by thousands_sep()[.](#3.sentence-5)
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The space character used is the value ct.widen(' ')[.](#3.sentence-6)
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Whitespace characters are those characters c for which ci.is(space, c) returns true[.](#3.sentence-7)
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The number of digits required after the decimal point (if any)
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is exactly the value returned by frac_digits()[.](#3.sentence-8)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/text.tex#L4548)
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The placement of thousands-separator characters (if any)
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is determined by the value returned by grouping(),
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defined identically as the member numpunct<>::do_grouping()[.](#4.sentence-1)
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[230)](#footnote-230)[230)](#footnoteref-230)
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An array of char,
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rather than an array of part,
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is specified for pattern::field purely for efficiency[.](#footnote-230.sentence-1)
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