C++ Move constructor won't compile

Question

I have an unfortunate problem. My GCC 4.6.3 compiler refuses to compile my move constructor. Exchanging line 6 in the example with "MemoryBlock(const MemoryBlock & other)" would make it compile, but not using the below move constructor declaration. Seems like the compiler does not know C+11, even though it should using 4.6.3. Right?

#include <cstddef> class MemoryBlock { public: MemoryBlock(MemoryBlock && other) //<----------- RAD 6. { } private: size_t _length; // The length of the resource. int* _data; // The resource. }; int main() { }

Compiler output:

prog.cpp:6:28: error: expected ‘,’ or ‘...’ before ‘&&’ token

prog.cpp:6:36: error: invalid constructor; you probably meant ‘MemoryBlock (const MemoryBlock&)’

make: * [slask] Error 1

GCC version:

g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 (Kör från labbsal i skolan)

makefile:

%.out: %.cpp g++ -g -W -Wall -std=c++0x $*.cpp -o $*.out;

Works fine on my GCC 4.6.3. Make sure you're actually using the right version; check directly on the command line without makefile perhaps. — Kerrek SB
– Kerrek SB, Commented Sep 30, 2013 at 12:54
I did verify my version (g++ --version) and its correct. However, you are right, it works. The problem seem to lie within my makefile. Thanks alot! My makefile seemed so simple that I didn't really consider it an issue. Any idea what could be the problem using this makefile? — user2831216
– user2831216, Commented Sep 30, 2013 at 12:58
Your makefile may not be using the rule you specified, but the default rule. — Kerrek SB
– Kerrek SB, Commented Sep 30, 2013 at 13:00
You can greatly simplify the makefile for small code samples by setting CXXFLAGS and letting the default rules do their job. — juanchopanza
– juanchopanza, Commented Sep 30, 2013 at 13:01
In fact, the more I look at it, the more it seems that Everything Is Wrong with that makefile. Maybe pick up a Makefile tutorial and work though it slowly, step-by-step. Especially substitution rules and magic variables should be double-checked. — Kerrek SB
– Kerrek SB, Commented Sep 30, 2013 at 13:01

donjuedo · Accepted Answer · 2015-06-15 18:10:41Z

1

Try -std=c++11 instead of -std=c++0x. While your compiler knows the usage, the -std=c++0x "turns off" those new rules.

answered Jun 15, 2015 at 18:10

donjuedo

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