The header <iomanip> defines several functions that support extractors and inserters that alter information maintained by class ios_base and its derived classes.
unspecified resetiosflags(ios_base::fmtflags mask);
Returns: An object of unspecified type such that if out is an object of type basic_ostream<charT, traits> then the expression out << resetiosflags(mask) behaves as if it called f(out, mask), or if in is an object of type basic_istream<charT, traits> then the expression in >> resetiosflags(mask) behaves as if it called f(in, mask), where the function f is defined as:326
void f(ios_base& str, ios_base::fmtflags mask) {
str.setf(ios_base::fmtflags(0), mask);
}
The expression out << resetiosflags(mask) shall have type basic_ostream<charT, traits>& and value out. The expression in >> resetiosflags(mask) shall have type basic_istream<charT, traits>& and value in.
unspecified setiosflags(ios_base::fmtflags mask);
Returns: An object of unspecified type such that if out is an object of type basic_ostream<charT, traits> then the expression out << setiosflags(mask) behaves as if it called f(out, mask), or if in is an object of type basic_istream<charT, traits> then the expression in >> setiosflags(mask) behaves as if it called f(in, mask), where the function f is defined as:
void f(ios_base& str, ios_base::fmtflags mask) {
str.setf(mask);
}
The expression out << setiosflags(mask) shall have type basic_ostream<charT, traits>& and value out. The expression in >> setiosflags(mask) shall have type basic_istream<charT,
traits>& and value in.
unspecified setbase(int base);
Returns: An object of unspecified type such that if out is an object of type basic_ostream<charT, traits> then the expression out << setbase(base) behaves as if it called f(out, base), or if in is an object of type basic_istream<charT, traits> then the expression in >> setbase(base) behaves as if it called f(in, base), where the function f is defined as:
void f(ios_base& str, int base) {
str.setf(base == 8 ? ios_base::oct :
base == 10 ? ios_base::dec :
base == 16 ? ios_base::hex :
ios_base::fmtflags(0), ios_base::basefield);
}
The expression out << setbase(base) shall have type basic_ostream<charT, traits>& and value out. The expression in >> setbase(base) shall have type basic_istream<charT, traits>& and value in.
unspecified setfill(char_type c);
Returns: An object of unspecified type such that if out is an object of type basic_ostream<charT, traits> and c has type charT then the expression out << setfill(c) behaves as if it called f(out, c), where the function f is defined as:
template<class charT, class traits>
void f(basic_ios<charT, traits>& str, charT c) {
str.fill(c);
}
The expression out << setfill(c) shall have type basic_ostream<charT, traits>& and value out.
unspecified setprecision(int n);
Returns: An object of unspecified type such that if out is an object of type basic_ostream<charT, traits> then the expression out << setprecision(n) behaves as if it called f(out, n), or if in is an object of type basic_istream<charT, traits> then the expression in >> setprecision(n) behaves as if it called f(in, n), where the function f is defined as:
void f(ios_base& str, int n) {
str.precision(n);
}
The expression out << setprecision(n) shall have type basic_ostream<charT, traits>& and value out. The expression in >> setprecision(n) shall have type basic_istream<charT, traits>& and value in.
unspecified setw(int n);
Returns: An object of unspecified type such that if out is an instance of basic_ostream<charT, traits> then the expression out << setw(n) behaves as if it called f(out, n), or if in is an object of type basic_istream<charT, traits> then the expression in >> setw(n) behaves as if it called f(in, n), where the function f is defined as:
void f(ios_base& str, int n) {
str.width(n);
}
The expression out << setw(n) shall have type basic_ostream<charT, traits>& and value out. The expression in >> setw(n) shall have type basic_istream<charT, traits>& and value in.
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