Checks if player has enough money to buy an item, and buys it if possible

demo_kvdatabase.cpp

#include "MawKit/KVDatabase.hpp"

bool buyIfPossible( long long price )
{
  constexpr const char *moneyKey = "money";
  
  if ( MK::KVDatabase::getLongValueForKey( moneyKey ) > price ) {
    MK::KVDatabase::decreaseLongValueForKey( moneyKey, price );
    return true;
  }
  
  return false;
}