c++ - 在成员初始化列表中填充 std::array

Question

以下代码有效，但我想避免警告:

warning: 'fitness::vect_' should be initialized in the member initialization list [-Weffc++]

当使用 g++ -Weffc++ 开关编译时:

#include <array>

template<class T, unsigned N>
class fitness
{
public:
  explicit fitness(T v)
  {
    static_assert(N, "fitness zero length");

    vect_.fill(v);
  }

private:
  std::array<T, N> vect_;
};

int main()
{
  fitness<double, 4> f(-1000.0);

  return 0;
}

我应该忽略警告吗？有没有办法在构造函数初始化列表中填充 vect_(不改变其类型)？

Answer 1

我相信你可以忽略这个警告。

如果您在构造函数中为数组放置一个空的初始化，它会起作用:

#include <array>

template<class T, unsigned N>
class fitness
{
public:
  explicit fitness(T v):
  vect_{}
  {
    static_assert(N, "fitness zero length");

    vect_.fill(v);
  }

private:
  std::array<T, N> vect_;
};

int main()
{
  fitness<double, 4> f(-1000.0);

  return 0;
}