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Pacopag

Member

Registered: 2011-05-29

Posts: 287

C++: error: ‘std::unique_ptr’ has not been declared

Hi.  I'm trying to compile some C++ code (that I didn't write) and I keep getting this error

error: ‘std::unique_ptr’ has not been declared

I've just got all my .h and .cpp files in one folder, and from there I'm trying

g++ -std=c++11 *.cpp

I know this probably looks bad, but I don't have a makefile.

The real point is, why doesn't gcc recognize unique_ptr when I'm explicitly specifying to g++ to use c++11?

cris9288

Member

Registered: 2013-01-07

Posts: 348

Re: C++: error: ‘std::unique_ptr’ has not been declared

Did you #include<memory> ? Perhaps I'm wrong, but this page seems to think it is necessary. http://en.cppreference.com/w/cpp/memory/unique_ptr

Pacopag

Member

Registered: 2011-05-29

Posts: 287

Re: C++: error: ‘std::unique_ptr’ has not been declared

A grep on it turns up nothing, so I don't think that's included anywhere.

I've seen it with my own eyes that this project builds successfully as is in xcode on a mac.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,346

Re: C++: error: ‘std::unique_ptr’ has not been declared

IIRC, xcode does not use gcc by default; the libraries would be different implementation.  I realize we are talking about std:: here, but perhaps the header files have a different hierarchy.  That, or  Xcode is pulling some slight of hand and helping you without asking.

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