太多的初始化值c ++答案

【问题标题】：too many initializer values c++太多的初始化值c ++
【发布时间】：2021-01-29 03:40:36
【问题描述】：

有人可以解释为什么我会收到以下编译器错误：

错误：‘std::array<:array>, 8>

的初始化程序太多

#include <iostream>
#include <array>

using namespace std;

enum State
{
  NONE,
  WHITE,
  BLACK
};


int main()
{

  array<array<State, 2>, 8> initial = {
    { State::NONE, State::NONE },
    { State::WHITE, State::WHITE },
    { State::NONE, State::NONE },
    { State::NONE, State::NONE },
    { State::NONE, State::NONE },
    { State::NONE, State::NONE },
    { State::BLACK, State::BLACK },
    { State::NONE, State::NONE }
  };

  return 0;
}

【问题讨论】：

您只需要另外一对braces。
有趣的是，clang 从字面上调用memset 来清空数组，然后设置非零字段。我也检查了 gcc，它设置了每个单独的字段，正如你很可能期望的那样。

标签： c++ matrix multidimensional-array compiler-errors

【解决方案1】：

您可以像这样使用普通数组：

State ini[8][2] = {
   { State::NONE, State::NONE },
  { State::WHITE, State::WHITE },
  { State::NONE, State::NONE },
  { State::NONE, State::NONE },
  { State::NONE, State::NONE },
  { State::NONE, State::NONE },
  { State::BLACK, State::BLACK },
  { State::NONE, State::NONE }
};

或者修复你的代码添加一对括号：

 array<array<State, 2>, 8> initial = { {
      {State::NONE, State::NONE },
      { State::WHITE, State::WHITE },
      { State::NONE, State::NONE },
      { State::NONE, State::NONE },
      { State::NONE, State::NONE },
      { State::NONE, State::NONE },
      { State::BLACK, State::BLACK },
      { State::NONE, State::NONE }
    } };

【讨论】：