C++ code for board[8][8] representation

[Rein Halbersma]

Code: Select all

#include <array>
  
constexpr auto mapping = [] {
    std::array<int, 128> ret{};
    ret['K'] = 1;
    ret['Q'] = 2;
    return ret;
}();

Or you can just use an immediately invoked lambda expression

[ydebilloez]

Thanks

Code: Select all

constexpr auto mapping = [] {
    std::array<int, 128> ret{};
}();

Code: Select all

std::array<int, 128> ret{0};

combining this gives:

Code: Select all

// .h
class bEvaluation {
protected:
  static std::array<int, 128> bPieceIndex;
// .cpp
auto bEvaluation::bPieceIndex = [] {
  std::array<int, 128> bIndex{0};
  bIndex['K'] = 1;
  // etc

warning: declaration requires a global constructor

But lets say, we went halfway around the problem in some way. A static array does not need a destructor...

I still have some related problems:

Code: Select all

appInstance& App() {
  static appInstance instance;
// declaration requires exit time constructor
  return instance;
}
void classname::functname(param) const
{
  static std::string sName = "Hello";

warning: declaration requires exit time constructor

[Sesse]

You need the constexpr part.

[ydebilloez]

Using a simple global c array ended up easier in C++11...

Still stuck on static std::string X = "" in a function that gives the same error.

I assure you, I can fix it with a simple static char[255]... But I want to keep it c++11 and at the same time getting rid of the destructor error warning.