I have been using stoi to convert string representation of numbers
into int since long. Only recently one such program of mine stopped
working giving following error:

string_int.cpp: In function 'int main(int, char**)':
string_int.cpp:29: error: 'stoi' is not a member of 'std'

Here is the code snippet:

std::string newValStr = "777;
int newValInt = 0;
newValInt = std::stoi(newValStr);

I looked around internet and there doesn't seem to be any update on
it. I am compiling it using g++ on Redhat Linux 6.2 with following
gcc version:

gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC)

Has anyone else also faced something similar?

Do you have C++11 enabled when compiling? -std=c++11? Maybe you changed
your compiler flags and it's now missing.

std::stoi was added in C++11. http://en.cppreference.com/w/cpp/string/basic_string/stol

Regards,
Frank


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On 05/11/2015 13:25, Elias Salom�o Helou Neto wrote:

Em quarta-feira, 4 de novembro de 2015 11:00:50 UTC-2, kiran escreveu:

I have been using stoi to convert string representation of numbers into

int

since long. Only recently one such program of mine stopped working giving
following error:

string_int.cpp: In function 'int main(int, char**)':
string_int.cpp:29: error: 'stoi' is not a member of 'std'

Here is the code snippet:

std::string newValStr = "777;
int newValInt = 0;
newValInt = std::stoi(newValStr);

I looked around internet and there doesn't seem to be any update on it. I

am

compiling it using g++ on Redhat Linux 6.2 with following gcc version:

gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC)

Has anyone else also faced something similar?

Are you including the <string> header? End there is a missing " in the

code.

Anyway, if you would like an advise, I'd recommend you to use

istringstream

and operator >> in order to perform tihs conversion in a more C++ish way.

Best,
Elias.

:) Surely using the C++ Standard Library is the C++ way. I think, that
as others have suggested, you need to check your compiler switches. Most compilers allow you to select which version of C++ you are using. You
need C++ 11 or higher for stoi to be available.

Francis


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Em quarta-feira, 4 de novembro de 2015 11:00:50 UTC-2, kiran escreveu:

I have been using stoi to convert string representation of numbers into

int

since long. Only recently one such program of mine stopped working giving following error:

string_int.cpp: In function 'int main(int, char**)':
string_int.cpp:29: error: 'stoi' is not a member of 'std'

Here is the code snippet:

std::string newValStr = "777;
int newValInt = 0;
newValInt = std::stoi(newValStr);

I looked around internet and there doesn't seem to be any update on it. I

am

compiling it using g++ on Redhat Linux 6.2 with following gcc version:

gcc version 4.4.6 20110731 (Red Hat 4.4.6-3) (GCC)

Has anyone else also faced something similar?

Are you including the <string> header? End there is a missing " in the code.


Anyway, if you would like an advise, I'd recommend you to use istringstream
and operator >> in order to perform tihs conversion in a more C++ish way.

Best,
Elias.


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- The double quotes around 777, missing in the my post above, were indeed present in the program.
- I included the <string> header file.
- As a workaround I did use stringstream in the meantime.

The conclusion: My compiler flags were missing. Once I added -std=c++0x,
stoi is working good.

Thank you all for the responses. I am able to get it working now.

- Kiran


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