code cannot compile in Visual Studio 2015 #2
Description
Error msg:
1> Boost.Cpp11.2013.x64.vcxproj -> C:\dev\tapescript_vs2015\bin\vc120-x64-debug\libboost_unit_test_framework-vc120-mt-gd-1_57.lib
2>------ Rebuild All started: Project: Cl.Tape.Cpp11.2013.x64, Configuration: Debug x64 ------
3>------ Rebuild All started: Project: Cl.Tape.Examples.Cpp11.2013.x64, Configuration: Debug x64 ------
3> tape_other_translation_line.cpp
3> tape_example.cpp
3>c:\dev\tapescript_vs2015\tapescript\cpp\cl\tape\examples\impl\quadratic_regression_examples.hpp(209): error C2280: 'cl::tape_innercl::tape_array &cl::tape_innercl::tape_array::operator =(const cl::tape_innercl::tape_array &)': attempting to reference a deleted function
3> c:\dev\tapescript_vs2015\tapescript\cpp\cl\tape\impl\inner\tape_inner.hpp(289): note: compiler has generated 'cl::tape_innercl::tape_array::operator =' here
3> Generating Code...
========== Rebuild All: 2 succeeded, 1 failed, 0 skipped ==========
Reason: tape_inner has declared move constructor but not copy constructor. The source code above requires a copy constructor to compile.
In C++11 standard, a copy constructor should not be automatically generated if a move constructor is available. So above code should not compile. In this sense, VS2015 behaves correctly.
VS2013 is known not implementing such C++11 standard.
See links here:
https://msdn.microsoft.com/en-us/library/hh567368%28v=vs.120%29.aspx#rvref (on Rvalue references 3.0)
https://msdn.microsoft.com/en-ca/library/dn457344%28v=vs.120%29.aspx