Qt 5 class parameter as std::function<>

[Scope]

I can compile without any problem this

class ClassName
{
public:
    ClassName(int x, const std::function<double(quint16,quint16)>& func, int y, int z);
};

class ClassName
{
public:
    ClassName(int x, const std::function<double(quint16,quint16)>& func, int y, int z);
};

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and inside .pro file I have line

CONFIG += C++14

CONFIG += C++14

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