c++内置容器的临时变量初始化参数

有一个需求，需要用类有参数的构造函数初始化无参构造函数，而参数是容器类型，这就需要直接传入临时变量给有参构造函数。

#include<iostream>
#include<array>
#include<vector>

#if 1
class Base
{
private:
	std::array<double, 2> _pixelSpacing;
public:
	Base(const std::array<double, 2>& pixel_spacing) :_pixelSpacing(pixel_spacing) {}
	Base() :Base(std::array<double, 2>{0.51, 0.51}) {}	
	//
	bool getPixelSpacing() 
	{
		std::cout << __FUNCTION__ << std::endl;
		std::cout << _pixelSpacing[0] << "," << _pixelSpacing[1] << std::endl;
		return true;
	}

};
#endif

void test(const std::vector<int>& v)
{
	for (const auto& item : v)
	{
		std::cout << item << std::endl;
	}
}

int main()
{
	Base b1;
	b1.getPixelSpacing();

	Base b2(std::array<double, 2>{0.53, 0.63});
	b2.getPixelSpacing();
	
	test(std::vector<int>{1, 3, 3, 4});

	return 0;
}