std错误名称空间中没有名为“ bind”的成员

Question

The following codes can run very well in WINDOWS and LINUX but fail in MAC:

template <typename T>
inline bool similar_fun(const std::vector<T> &a, const std::vector<T> &B, T threshold)
{
    using namespace std::placeholders;

    std::vector<T> differ;
    std::transform(a.begin(), a.end(), b.begin(),
        std::back_inserter(differ), std::bind(sub_fun<T>, _1, _2));

    return (std::accumulate(differ.begin(), differ.end(), static_cast<T>(0), Norm2<T>()) <= threshold);
}

The development platform is Xcode 4, and the compiler is Clang LLVM 1.0. I also make sure that the compiler is using the new C++ standard c++0x. The error messages are as follows:

   using namespace std::placeholders; *Expect namespace name
std::bind(sub_fun) *No member named "bind" in namespace std

Answer 1

Clang LLVM 1.0 seems pretty old, it's from 2003, so the standard library you have installed probably is a C++03 standard library that does not have placeholders and bind . You could try to include new C++11 headers, eg <array> to confirm that.

If I am right, just update your compiler :-)