Standard C++ Library Reference ISO/IEC (VERSION3)

ios_base::event_callback
typedef void *(event_callback(event ev,
ios_base& iosbase, int idx);
The type describes a pointer to a function that can be registered with register_callback. Such
a function must not throw an exception.
ios_base::failure
class failure : public exception {
public:
explicit failure(const string& what_arg) {
};
The member class serves as the base class for all exceptions thrown by the member function clear
in template class basic_ios. The value returned by what() is what_arg.data().
ios_base::flags
fmtflags flags() const;
fmtflags flags(fmtflags newfmtflags);
The first member function returns the stored formatflags. The second member function stores
newfmtflags in the format flags and returns its previous stored value.
ios_base::fmtflags
typedef T1 fmtflags;
static const fmtflags boolalpha, dec, fixed, hex,
internal, left, oct, right, scientific,
showbase, showpoint, showpos, skipws, unitbuf,
uppercase, adjustfield, basefield, floatfield;
The type is a bitmask type T1 that describes an object that can store format flags. The distinct flag
values (elements) are:
boolalpha, to insert or extract objects of type bool as names (such as true and false)
rather than as numeric values
●
dec, to insert or extract integer values in decimal format●
fixed, to insert floating-point values in fixed-point format (with no exponent field)●
hex, to insert or extract integer values in hexadecimal format●
internal, to pad to a field width as needed by inserting fill characters at a point internal to a
generated numeric field
●
left, to pad to a field width as needed by inserting fill characters at the end of a generated
field (left justification)
●
oct, to insert or extract integer values in octal format●