Output stream class to operate on strings.
Questions tagged [ostringstream]
150 questions
2
votes
1 answer
ostringstream operator<< for long?
$ uname -a
Darwin Wheelie-Cyberman 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386
$ g++ --version
i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
Copyright (C)…
phs
- 10,687
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2
votes
2 answers
How do I perform string formatting to a static buffer in C++?
I am working in a section of code with very high performance requirements. I need to perform some formatted string operations, but I am trying to avoid memory allocations, even internal library ones.
In the past, I would have done something similar…
Deon McClung
- 191
- 2
- 8
2
votes
1 answer
double to string with ostringstream syntax
I'd like to understand why writing this
static_cast( &(std::ostringstream() << speed.x) )->str();
makes a string, but not this
(std::ostringstream() << speed.x).str();?
in fact the latter doesn't even compile...
I find this…
Sheed
- 577
- 4
- 18
2
votes
2 answers
how to truncate width of integral types with std::ostringstream?
Say you have something like:
std::ostringstream oss;
int value(42);
oss.fill('0');
oss << std::setw(3) << value;
cout << oss.str();
OUTPUT: 042
This output is because std::setw ensures a minimum width and we told the stream to fill with 0 however…
AJG85
- 15,849
- 13
- 42
- 50
2
votes
2 answers
stringstream and multithreading
I'm new to multithreading and C++ and I'm having a problem when trying to use threads in my application which save files. The code is as follows:
#include
#include
#include
#include
#include
using…
Billy
- 357
- 1
- 5
- 14
2
votes
0 answers
Crash in std::basic_stringbuf::overflow
I'm testing a C++ library under Cygwin in a debug configuration. The debug configuration includes the following CXXFLAGS:
-DDEBUG -g3 -O2 -D_GLIBCXX_DEBUG -std=c++03
The test is dying at:
Testing PolynomialMod2 bit operations...
Program received…
jww
- 97,681
- 90
- 411
- 885
2
votes
3 answers
Getting char* array from c++ stringstream ostringstream
I am trying to copy ostringstream to a char* array and am hoping someone can help me with understanding where my mistake lies. I looked on the forum, found some things that are similar and unfortunately am still am unable to get property copy from…
JavaFan
- 1,295
- 3
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- 28
2
votes
2 answers
Truncate C++ string fields generated by ostringstream, iomanip:setw
In C++ I need string representations of integers with leading zeroes, where the representation has 8 digits and no more than 8 digits, truncating digits on the right side if necessary. I thought I could do this using just ostringstream and…
Ian Durkan
- 1,212
- 1
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- 26
2
votes
1 answer
suppress "minus zero" from cout
double value;
std::ostringstream s;
s << std::fixed << std::setprecision(3) << value;
When value wanders in the range -1.0e-14 to 1.0e-14, s flickers between "0.000" and "-0.000".
Is there a clean way to suppress the minus sign, which only…
Camille Goudeseune
- 2,934
- 2
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- 56
2
votes
2 answers
Crash when using "time.h"
==FINAL CLASS BENEATH THIS LINE==
It was not an issue with std::ostringstream, I was doing bad things with "time.h" which I did not fully understand. The original question shows up after the class. The final class looks like…
shieldfoss
- 886
- 2
- 12
- 22
2
votes
3 answers
C++ Odd behaviour with ostringstream
Is there any explanation in the standard for the below behavior?
The following code:
#include
#include
using namespace std;
int main()
{
ostringstream os1;
ostringstream os2;
os1 << 1 << " " << 2;
os2 << 1 <<…
P.An
- 355
- 1
- 9
2
votes
2 answers
trying to print from ostream but printing a blank instead
I have a lot of logging functions, which right now accept an ostringstream&. My goal is to make them able to accept a stream written in one line, something like this:
MyPrint( ostringstream() << "hello!" << endl);
I cannot change the method…
gil_bz
- 478
- 1
- 5
- 16
2
votes
1 answer
Copy contructor error with no obvious copy
I'm attempting to build a bit of simple logging functionality from scratch, with a stream like '<<' interface, and am running into a bit of compiler issue. Here is the basics of my code:
#include
#include
#include…
WillW
- 871
- 6
- 18
2
votes
1 answer
deserializing objects in C++
I know how to serialize an object in the following way:
void encodeMsg(char **msg, const ConnectionParams& params)
{
std::ostringstream oss;
if (!(oss << params))
{
//failure
}
msg = oss.str();
}
how can i deserialize a…
CodeMonkey
- 11,196
- 30
- 112
- 203
2
votes
1 answer
Save away ostringreader.str().c_str()
Why does the value of text1 change after reading out y in this piece of code?
void func()
{
int value1 = 5;
double value2 = 1.5;
std::ostringstream x, y;
x << value1;
y << value2;
const char *text1 = x.str().c_str();
…
Civing
- 353
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- 12