Does libstdc++ not implement std::stoi?

Question

I want to use std::stoi. Although I could use ::atoi(str.c_str()) it would make the code cleaner if this would work. But Eclipse tells me:

Function 'stoi' could not be resolved

I checked that

the header <string> is included,
include paths are set correctly, as I can use std::string,
the compiler flag -std=c++0x -std=c++11 is set too.

Is stoi() missing in gcc, or is it somehow my fault?

I am using gcc (Debian 4.7.2-4) 4.7.2.

You should probably have only -std=c++11. Can't imagine that would cause this bug though. (Also, just to confirm, you are either using std::stoi or pulling in the std namespace?) Wait.... Will it compile? Like Nikos C. said below, it might just be Eclipse complaining. — Corbin
– Corbin, Commented Nov 19, 2012 at 12:27

Nikos C. · Accepted Answer · 2012-11-19 12:29:13Z

17

You're using GCC 4.7.2, so std::stoi is supported. You can ignore the Eclipse warning. It should compile and run fine. The problem is with the Eclipse editor, not with GCC.

(You only need the -std=c++11 or -std=gnu++11 [to also get the GCC extensions] flag, btw. -std=c++0x is just a deprecated synonym.)

answered Nov 19, 2012 at 12:29

Nikos C.

52.2k10 gold badges77 silver badges104 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Sergey K. Over a year ago

c++11 and gnu++11 are different.

Nikos C. Over a year ago

@SergeyK. I know. But both enable C++-11 support.

ManuelSchneid3r Over a year ago

Okay, yes your right. It compiles. Can I somehow do something aganist these Eclipse errors?

Nikos C. Over a year ago

@DevNoob Maybe this helps: stackoverflow.com/questions/9131763/eclipse-cdt-c11-c0x-support

Christian Rau Over a year ago

+1 Hah, nice one. Try to compile it before taking Eclipse's stupid complaints too serious.

Eric B · Accepted Answer · 2012-11-19 13:20:47Z

You can get rid of the red squiggles in eclipse, (from here):

Project Properties->C/C++ General->Preprocessor Include Paths, Macros->[Providers] tab->your Built-in Compiler Settings provider (toolchain dependent). Click on "Workspace Settings" link which gets you to "Settings" property page, select [Discovery] tab and your provider again. There is "Command to get compiler specs", add "-std=c++11" in there.

hit apply and close everything, then index->rebuild and you should be all set.

Or, if your version of eclipse is older, you might just have to do this:

Project->Properties->C/C++ Build->Discovery Options->GCC C++ Compiler

and add the "-std=c++11" flag to the invocation arguments there. This is "deprecated" though, so you may want to consider updating Eclipse since you're updating your compiler too.

I read this in the eclipse FAQ, but the problem was, that it was not set permanent. It chnaged nothing and after reopening project settings the flag has dissapeared.
It fixed it permanently for me. You might have to close eclipse and re-open?
Goddamn. okay its permanent. But __GXX_EXPERIMENTAL_CXX0X__ solves the stoi problem. But raises a vector.insert problem. but your way does not solve stoi problem. Its horrible.

Collectives™ on Stack Overflow

Does libstdc++ not implement std::stoi?

2 Answers 2

5 Comments

3 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

5 Comments

3 Comments

Linked

Related