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Showing content from https://timsong-cpp.github.io/cppwp/n4659/facet.num.put.virtuals below:

[facet.num.put.virtuals]

iter_type do_put(iter_type out, ios_base& str, char_type fill, long val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, long long val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, unsigned long val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, unsigned long long val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, double val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, long double val) const; iter_type do_put(iter_type out, ios_base& str, char_type fill, const void* val) const;

Effects: Writes characters to the sequence out, formatting val as desired. In the following description, a local variable initialized with:

locale loc = str.getloc();

The details of this operation occur in several stages:

• Stage 1: Determine a printf conversion specifier spec and determine the characters that would be printed by printf ([c.files]) given this conversion specifier for

  printf(spec, val)

  assuming that the current locale is the "C" locale.

• Stage 2: Adjust the representation by converting each char determined by stage 1 to a charT using a conversion and values returned by members of use_­facet<numpunct<charT>>(str.getloc())

• Stage 3: Determine where padding is required.

• Stage 4: Insert the sequence into the out.

Detailed descriptions of each stage follow.

• Stage 1: The first action of stage 1 is to determine a conversion specifier. The tables that describe this determination use the following local variables

  fmtflags flags = str.flags();
  fmtflags basefield =  (flags & (ios_base::basefield));
  fmtflags uppercase =  (flags & (ios_base::uppercase));
  fmtflags floatfield = (flags & (ios_base::floatfield));
  fmtflags showpos =    (flags & (ios_base::showpos));
  fmtflags showbase =   (flags & (ios_base::showbase));
  fmtflags showpoint =  (flags & (ios_base::showpoint));

  All tables used in describing stage 1 are ordered. That is, the first line whose condition is true applies. A line without a condition is the default behavior when none of the earlier lines apply.

  For conversion from an integral type other than a character type, the function determines the integral conversion specifier as indicated in Table 75.

  Table

  75

  — Integer conversions

  
  State stdio equivalent basefield == ios_­base​::​oct %o (basefield == ios_­base​::​hex) && !uppercase %x (basefield == ios_­base​::​hex) %X for a signed integral type %d for an unsigned integral type %u

  For conversion from a floating-point type, the function determines the floating-point conversion specifier as indicated in Table 76.

  Table

  76

  — Floating-point conversions

  
  State stdio equivalent floatfield == ios_­base​::​fixed %f floatfield == ios_­base​::​scientific && !uppercase %e floatfield == ios_­base​::​scientific %E floatfield == (ios_­base​::​fixed | ios_­base​::​scientific) && !uppercase %a floatfield == (ios_­base​::​fixed | ios_­base​::​scientific) %A !uppercase %g otherwise %G

  For conversions from an integral or floating-point type a length modifier is added to the conversion specifier as indicated in Table 77.

  Table

  77

  — Length modifier

  
  Type Length modifier long l long long ll unsigned long l unsigned long long ll long double L otherwise none

  The conversion specifier has the following optional additional qualifiers prepended as indicated in Table 78.

  Table

  78

  — Numeric conversions

  
  Type(s) State stdio equivalent an integral type showpos + showbase # a floating-point type showpos + showpoint #

  For conversion from a floating-point type, if floatfield != (ios_­base​::​fixed | ios_­base​::​​scientific), str.precision() is specified as precision in the conversion specification. Otherwise, no precision is specified.

  For conversion from void* the specifier is %p.

  The representations at the end of stage 1 consists of the char's that would be printed by a call of printf(s, val) where s is the conversion specifier determined above.

• Stage 2: Any character c other than a decimal point(.) is converted to a charT via use_­facet<ctype<charT>>(loc).widen( c )

  A local variable punct is initialized via

  const numpunct<charT>& punct = use_facet<numpunct<charT>>(str.getloc());

  For arithmetic types, punct.thousands_­sep() characters are inserted into the sequence as determined by the value returned by punct.do_­grouping() using the method described in [facet.numpunct.virtuals]

  Decimal point characters(.) are replaced by punct.decimal_­point()

• Stage 3: A local variable is initialized as

  fmtflags adjustfield = (flags & (ios_base::adjustfield));

  The location of any padding240 is determined according to Table 79.

  Table

  79

  — Fill padding

  
  State Location adjustfield == ios_­base​::​left pad after adjustfield == ios_­base​::​right pad before adjustfield == internal and a sign occurs in the representation pad after the sign adjustfield == internal and representation after stage 1 began with 0x or 0X pad after x or X otherwise pad before

  If str.width() is nonzero and the number of charT's in the sequence after stage 2 is less than str.​width(), then enough fill characters are added to the sequence at the position indicated for padding to bring the length of the sequence to str.width().

  str.width(0) is called.

• Stage 4: The sequence of charT's at the end of stage 3 are output via

  *out++ = c

iter_type do_put(iter_type out, ios_base& str, char_type fill, bool val) const;

Returns: If (str.flags() & ios_­base​::​boolalpha) == 0 returns do_­put(out, str, fill,
(int)val), otherwise obtains a string s as if by

string_type s =
  val ? use_facet<numpunct<charT>>(loc).truename()
      : use_facet<numpunct<charT>>(loc).falsename();

and then inserts each character c of s into out via *out++ = c and returns out.

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