iomanip setw() and std::string

[[rob desbois]]

Hi all,

I've just discovered that when outputting a string in combination with
the I/O manipulator setw(n), it doesn't affect the string. Instead the
string's c_str() method must be called for setw() to work.

I initially thought it was a bug in my implementation, but apparently
not.
Can anyone inform me why this is?

TIA,
--rob

 

[James Kanze]

I've just discovered that when outputting a string in combination with
the I/O manipulator setw(n), it doesn't affect the string. Instead the
string's c_str() method must be called for setw() to work.

I initially thought it was a bug in my implementation, but
apparently not. Can anyone inform me why this is?

Sounds like a bug to me. The insertion operator on an
std::string is required to take the width into account, and
always has been. And it works with all of the implementations
of the library I have available here (g++, Roguewave and
STLport).