CODEWITHSUNDEEP
c++c++11compiler-errorsc++14unique-ptr
smali
smali

Reputation: 4805

error::make_unique is not a member of ‘std’

I am trying to compile the following thread pool program posted on code review to test it.

https://codereview.stackexchange.com/questions/55100/platform-independant-thread-pool-v4

But I am getting the errors

threadpool.hpp: In member function ‘std::future<decltype (task((forward<Args>)(args)...))> threadpool::enqueue_task(Func&&, Args&& ...)’:
threadpool.hpp:94:28: error: ‘make_unique’ was not declared in this scope
     auto package_ptr = make_unique<task_package_impl<R, decltype(bound_task)>>  (std::move(bound_task), std::move(promise));
                        ^
threadpool.hpp:94:81: error: expected primary-expression before ‘>’ token
     auto package_ptr = make_unique<task_package_impl<R, decltype(bound_task)>>(std::move(bound_task), std::move(promise));
                                                                             ^
main.cpp: In function ‘int main()’:
main.cpp:9:17: error: ‘make_unique’ is not a member of ‘std’
 auto ptr1 = std::make_unique<unsigned>();
             ^
main.cpp:9:34: error: expected primary-expression before ‘unsigned’
 auto ptr1 = std::make_unique<unsigned>();
                              ^
main.cpp:14:17: error: ‘make_unique’ is not a member of ‘std’
 auto ptr2 = std::make_unique<unsigned>();
             ^
main.cpp:14:34: error: expected primary-expression before ‘unsigned’
 auto ptr2 = std::make_unique<unsigned>();

Upvotes: 120

Views: 165926

Answers (6)

Alex Cohn
Alex Cohn

Reputation: 57173

If you are stuck with c++11, you can get make_unique from abseil-cpp, an open source collection of C++ libraries drawn from Google’s internal codebase.

Upvotes: 2

Sirop4ik
Sirop4ik

Reputation: 5233

In my case I was needed update the std=c++

I mean in my gradle file was this

android {
    ...

    defaultConfig {
        ...

        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11", "-Wall"
                arguments "-DANDROID_STL=c++_static",
                        "-DARCORE_LIBPATH=${arcore_libpath}/jni",
                        "-DARCORE_INCLUDE=${project.rootDir}/app/src/main/libs"
            }
        }
       ....
    }

I changed this line 

android {
    ...

    defaultConfig {
        ...

        externalNativeBuild {
            cmake {
                cppFlags "-std=c++17", "-Wall"   <-- this number from 11 to 17 (or 14)
                arguments "-DANDROID_STL=c++_static",
                        "-DARCORE_LIBPATH=${arcore_libpath}/jni",
                        "-DARCORE_INCLUDE=${project.rootDir}/app/src/main/libs"
            }
        }
       ....
    }

That's it...

Upvotes: 1

kovac
kovac

Reputation: 5389

This happens to me while working with XCode (I'm using the most current version of XCode in 2019...). I'm using, CMake for build integration. Using the following directive in CMakeLists.txt fixed it for me:

set(CMAKE_CXX_STANDARD 14).

Example:

cmake_minimum_required(VERSION 3.14.0)
set(CMAKE_CXX_STANDARD 14)

# Rest of your declarations...

Upvotes: 1

Jagger Yu
Jagger Yu

Reputation: 637

1.gcc version >= 5
2.CXXFLAGS += -std=c++14
3. #include <memory>

Upvotes: 10

Anil8753
Anil8753

Reputation: 2731

If you have latest compiler, you can change the following in your build settings:

 C++ Language Dialect    C++14[-std=c++14]

This works for me.

Upvotes: 16

ComicSansMS
ComicSansMS

Reputation: 54589

make_unique is an upcoming C++14 feature and thus might not be available on your compiler, even if it is C++11 compliant.

You can however easily roll your own implementation:

template<typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args) {
    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}

(FYI, here is the final version of make_unique that was voted into C++14. This includes additional functions to cover arrays, but the general idea is still the same.)

Upvotes: 189

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