stringstream strange output

[drusakov]

consider the following piece of code, compiled with g++ 3.4 and
stlport 5.1 on Linux 64 bit (problem persists in 32 bit too)

std::stringstream ss;
int ii = 123;
ss << "test1";
std::cout<<ss.str()<<std::endl;
ss << ii << "test2";
std::cout << ss.str()<<std::endl;

The output I'm getting is quite strange:
test1
test1test2

It like 'ii' is not printed. If I remove line #4, then all is fine and
I get "test1123test2" also if to replace 'ii' in line 5 with some
string, like "test22", you'll get last line "test1test22test2" as
expected.

drives me crazy. any idea what it can be?

Thanks,
Dmitry

[Jeff Schwab]

drusakov wrote:

consider the following piece of code, compiled with g++ 3.4 and
stlport 5.1 on Linux 64 bit (problem persists in 32 bit too)

#include <iomanip>
#include <iostream>
#include <sstream>

int main() {

std::stringstream ss;
int ii = 123;
ss << "test1";
std::cout<<ss.str()<<std::endl;
ss << ii << "test2";
std::cout << ss.str()<<std::endl;

}

The output I'm getting is quite strange:
test1
test1test2

It like 'ii' is not printed. If I remove line #4, then all is fine and
I get "test1123test2" also if to replace 'ii' in line 5 with some
string, like "test22", you'll get last line "test1test22test2" as
expected.

Is it possible that memory is being corrupted elsewhere in your program?
What happens when you compile and run the above code as a stand-alone
program?

[James Kanze]

On Sep 23, 9:29 pm, drusakov <[e-mail]:

consider the following piece of code, compiled with g++ 3.4
and stlport 5.1 on Linux 64 bit (problem persists in 32 bit
too)

Just a question: why? G++ has one of the better library
implementations around, the STL port is one of the worst. So
why use it with g++?

std::stringstream ss;
int ii = 123;
ss << "test1";
std::cout<<ss.str()<<std::endl;
ss << ii << "test2";
std::cout << ss.str()<<std::endl;

The output I'm getting is quite strange:
test1
test1test2

It like 'ii' is not printed. If I remove line #4, then all is fine and
I get "test1123test2" also if to replace 'ii' in line 5 with some
string, like "test22", you'll get last line "test1test22test2" as
expected.

drives me crazy. any idea what it can be?

It would seem to be a bug in the STL. The above code works with
the default libraries with g++, Sun CC and VC++; I get the same
symptoms as you with Sun CC and the STL port, however.

--
James Kanze (GABI Software) email:ja*********@gmail.com
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