restore the flags

[Suomi]

Hi,

I have this declaration:

class A
{
public:

A(std::ostream &s) : a(s.precision()),
b(s.width()),
c(s.flags()) {};
~A() {};
A(A const &);
A &operator=(A const &);
private:
std::streamsize a, b;
std::ios_base::fmtflags c;
};

int main() {


std::cout << std::hex;
std::cout << "hexa = " << 123 << std::endl;
std::cout << "hexa = " << 123 << std::endl;
{
A::A ss(std::cout);
std::cout << std::dec << "decimal = " << 123 << std::endl;.
std::cout << "decimal = " << 123 << std::endl;
}
std::cout << "hexa = " << 123 << std::endl;

}

I would like to go out of scope and the previous state of std::cout should be restored.

I guess I should do something in the destructor. Any help?

Thanks in advance.

[arne]

Hi,

I have this declaration:

class A
{
public:

A(std::ostream &s) : a(s.precision()),
b(s.width()),
c(s.flags()) {};
~A() {};
A(A const &);
A &operator=(A const &);
private:
std::streamsize a, b;
std::ios_base::fmtflags c;
};

int main() {


std::cout << std::hex;
std::cout << "hexa = " << 123 << std::endl;
std::cout << "hexa = " << 123 << std::endl;
{
A::A ss(std::cout);
std::cout << std::dec << "decimal = " << 123 << std::endl;.
std::cout << "decimal = " << 123 << std::endl;
}
std::cout << "hexa = " << 123 << std::endl;

}

I would like to go out of scope and the previous state of std::cout should be restored.

I guess I should do something in the destructor. Any help?

Thanks in advance.

You may try the following. Seems to work ...

class A
{
public:

A(std::ostream &s) : a(s.precision()),
b(s.width()),
c(s.flags()),
sp(&s){}; // added
~A() { sp->flags(c); };
A(A const &);
A &operator=(A const &);
private:
std::streamsize a, b;
std::ios_base::fmtflags c;
std::ostream *sp; // added
};