传递一个std :: vector <char> 从istreambuf_iterator构造

Question

I have the following code:

std::ifstream ifs(fileName, std::ios_base::in | std::ios_base::binary);
std::vector<char> vecdata(std::istreambuf_iterator<char>(ifs), 
                          std::istreambuf_iterator<char>());
image->setData(std::move(vecdata));

setData is declared as follows:

void Image::setData(std::vector<char> && data);

I have the following error:

reader.cpp:752: error: no matching function for call to

'Image::setData(std::vector (&)(std::istreambuf_iterator >, std::istreambuf_iterator > (*)()))'

 image->setData(std::move(vecdata)); ^ 

candidate is:

image.h:12: void Image::setData(std::vector&&)

I am using gcc 4.91

MCVE with gcc 5.4, same behavior : http://rextester.com/QYA50737

Is this a gcc bug?

Thanks

Answer 1

You got Most Vexing Parse: use {} instead of () :

std::vector<char> vecdata{std::istreambuf_iterator<char>(ifs), 
                          std::istreambuf_iterator<char>()};