[C++11] How to use std::stoi std::stod

[idea]

Hello everyone.

Did anybody know how to use std::stoi and std::stod?

i always get error 'stol' is not a member of 'std'.

I use ndk r10c and toolchain 4.8.

I also has enabled c++11 support by adding -std=c++11.

Or, is this feature not supported by Android ndk?

[Alvin Schurman]

I don't think you need the std:: prefix for stol or its related functions.  You could try to use "stoi" instead of "std::stoi".  If the compiler barks at you then I suggest putting "using namespace std" below your #includes and trying plain "stoi" again.    

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[Michael]

These functions should be solely in the std::namespace and available since C++11, according to cppreference. There seem to be some C++11 functions that are simply not available in the NDK at least when using libstdc++. See also here: https://code.google.com/p/android/issues/detail?id=53460. Pity that Google has not fixed this issue yet -- it's been known for a while now.

By the way, 'using namespace std;' is almost always a bad idea. It's a big no-no in global scope in header files, and even in translation units I would not allow its usage (with locally-scoped ADL related exceptions, e.g. for swap()).

[Dmitry Moskalchuk]

Hi,

Probably it's bit outdated, but I'll reply here anyway.

Yes, std::stol is not available in GNU libstdc++ implementation shipped with Android NDK. It's not the only missing functionality - in fact, standard C++11 classes such as std::thread and std::mutex are not available too.

Fortunately, full C++ Standard Library implementation is available out-of-the-box in just released CrystaX NDK 10: https://www.crystax.net/android/ndk/10

You can use it as a drop-in replacement of Google's NDK. Hope that will help.

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[Daniel Tavares]

I solved this problem by switching the STL runtime to LLVM libC++.

APP_STL := c++_static

[Raj kumar]

HI, 

I changed to APP_STL := c++_static in Application.mk. 

So, I am getting following error:

* What went wrong:

Execution failed for task ':app:ndkBuild'.

ndk-build'' finished with non-zero exit value 2

my Application.mk file is as follows

# Android makefile for textsort shared lib, jni wrapper around libtextsort C API

APP_ABI := all

APP_OPTIM := release

APP_PLATFORM := android-21

# GCC 4.9 Toolchain - requires NDK r10

NDK_TOOLCHAIN_VERSION = 4.9

# GNU libc++ is the only Android STL which supports C++11 features

APP_STL := c++_static

APP_BUILD_SCRIPT := jni/Android.mk

APP_MODULES := libbagbash_jni

Please help me to fix this issue.

Thank you in advance.

[javacom]

Can you show the line of code that's causing this error? 

'stol' is not a member of 'std'.

Regards

[Dan Albert]

Can you show the line of code that's causing this error? 

'stol' is not a member of 'std'.

Any code using std::sto* and using gnustl will have this problem: https://github.com/android-ndk/ndk/issues/82 

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[Raj kumar]

HI,

Sorry for late reply,

I could able to fix the issue. It was c++11 configuration issue.

Thank you very much for your support.

On Thu, Dec 29, 2016 at 4:36 AM, 'Dan Albert' via android-ndk <andro...@googlegroups.com> wrote:

Can you show the line of code that's causing this error? 

'stol' is not a member of 'std'.

Any code using std::sto* and using gnustl will have this problem: https://github.com/android-ndk/ndk/issues/82 

On Sat, Dec 24, 2016 at 12:02 AM, javacom <java...@gmail.com> wrote:

Can you show the line of code that's causing this error? 

'stol' is not a member of 'std'.

Regards

idea <edise...@gmail.com> 於 2014年12月2日 上午8:37 寫道：

'stol' is not a member of 'std'.

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Regards,
---------------
Rajkumar