I've been developing a feature in c++, that is using some legacy code written C language.
I've been facing compiler error with overloaded versions of a function that either takes unique_ptr
or a raw pointer of the same type.
Simplified version of my code is given below:
class A{
public:
A():mDummy(0) { }
~A()=default;
int mDummy;
};
void handleObj(std::unique_ptr<A> ap){
std::cout<<ap->mDummy<<'\n';
}
void handleObj(A* ap){
std::cout<<ap->mDummy<<'\n';
}
int main(){
std::unique_ptr<A> obj{new A()};
std::thread t1{handleObj, std::move(obj)};
A* obj2{ new A()};
std::thread t2{handleObj, obj2};
if(t1.joinable())
t1.join();
if(t2.joinable())
t2.join();
}
when compiled getting this error:
/Users/dsatram/Desktop/overload_uniquePtr_rawPtr/main.cpp:29:17: error: no matching constructor for initialization of 'std::thread'
std::thread t1{handleObj, std::move(obj)};
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:359:9: note: candidate template ignored: couldn't infer template argument '_Fp'
thread::thread(_Fp&& __f, _Args&&... __args)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:289:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
thread(const thread&);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:315:5: note: candidate constructor not viable: requires single argument '__t', but 2 arguments were provided
thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) {__t.__t_ = _LIBCPP_NULL_THREAD;}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/thread:296:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
thread() _NOEXCEPT : __t_(_LIBCPP_NULL_THREAD) {}
Can some body help me understand whats wrong here?
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