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我在寫一個C++隊列中實現模板時遇到了一些麻煩。如果你們能幫我解決一些編譯器問題，我很樂意！帶隊列程序和模板的編譯器問題
這裏是我的編譯器輸出：
In file included from a7_main.cpp:3:0: Queue.h: In member function TYPE Queue::pushAndPop(TYPE):
Queue.h:33:25: warning: name lookup of x changed [enabled by default]
Queue.h:27:28: warning: matches this x under ISO standard rules [enabled by default]
Queue.h:30:11: warning: matches this x under old rules [enabled by default]
Queue.h: At global scope:
Queue.h:45:23: error: invalid use of template-name Queue without an argument list
Queue.h: In copy constructor Queue::Queue(Queue&) [with TYPE = V2, Queue = Queue]:
a7_main.cpp:56:19: instantiated from here
Queue.h:41:5: error: no matching function for call to Queue::pushAndPop(int)
Queue.h:41:5: note: candidate is:
Queue.h:27:28: note: TYPE Queue::pushAndPop(TYPE) [with TYPE = V2]
Queue.h:27:28: note: no known conversion for argument 1 from int to V2
我試圖使這些警告和錯誤的意識，但它讓我在一轍。這裏是我的代碼：
#if !defined QUEUE_SIZE
#define QUEUE_SIZE 30
#endif
using namespace std;
template <class TYPE> class Queue
{
private:
TYPE *array;
public:
Queue(Queue& other);
Queue();
~Queue();
Queue& operator=(Queue other);
TYPE pushAndPop(TYPE x);
};
template <class TYPE> Queue<TYPE>::Queue()
{
array=new TYPE[size];
}
template <class TYPE> Queue<TYPE>::~Queue()
{
delete [] array;
}
template <class TYPE> TYPE Queue<TYPE>::pushAndPop(TYPE x)
{
TYPE item = array[0];
for(int x = 0; x<QUEUE_SIZE-1; x++){
array[x]= array[x+1];
}
array[QUEUE_SIZE-1] = x;
return item;
}
template <class TYPE> Queue<TYPE>:: Queue(Queue& other)
{
int x;
for(x=0; x<QUEUE_SIZE;x++){
array[x] = other.pushAndPop(0);
}
}
template <class TYPE> Queue& Queue<TYPE>:: operator=(Queue other)
{
int x;
for(x=0; x<QUEUE_SIZE;x++){
array[x] = other.pushAndPop(0);
}
}
編輯：下面是調用代碼：
#include <ncurses.h>
#include <unistd.h>
#include "Queue.h"
//----------------------------------------------------
#define START_ROW (20)
#define START_COL (20)
#define SLEEP_MICROSECONDS ((1.0/20.0) * 1000000.0)
//----------------------------------------------------
// Simple storage for a row, column pair.
struct V2 {
int row, col;
};
//----------------------------------------------------
// Some of this ncurses code is, unfortunately, copied from
// the man page without full understanding.
void configureNcurses()
{
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
nodelay(stdscr, TRUE);
curs_set(0);
start_color();
init_pair(1, COLOR_RED, COLOR_BLACK);
init_pair(2, COLOR_GREEN, COLOR_BLACK);
init_pair(3, COLOR_YELLOW, COLOR_BLACK);
init_pair(4, COLOR_BLUE, COLOR_BLACK);
init_pair(5, COLOR_MAGENTA, COLOR_BLACK);
init_pair(6, COLOR_CYAN, COLOR_BLACK);
init_pair(7, COLOR_WHITE, COLOR_BLACK);
}
//----------------------------------------------------
// Draw centipede with sequence of foreground colors, or with
// background color, depending on "erase" flag.
// (Pass centipede by value to exercise copy constructor.)
void drawCentipede(Queue<V2> centipede, bool erase)
{
int drawCharacter;
int colorNumber;
V2 currentPosition, dummyPosition;
Queue<V2> centipedeCopy;
// Make a copy of centipede to be consumed during drawing.
// (Exercises assignment operator.)
centipedeCopy = centipede;
// Prepare to draw or erase, as requested.
if (erase)
drawCharacter = ' ';
else
drawCharacter = ' ' | A_REVERSE;
// Consume centipede copy to obtain data for drawing.
for (int i = 0; i < QUEUE_SIZE; ++i) {
colorNumber = 1 + (i % 7);
currentPosition = centipede.pushAndPop(dummyPosition);
attron(COLOR_PAIR(colorNumber));
mvaddch(currentPosition.row, currentPosition.col,
drawCharacter);
attroff(COLOR_PAIR(colorNumber));
}
}
//----------------------------------------------------
// Update position based on arrow key input.
void updatePosition(V2& position, int inputChar)
{
switch (inputChar) {
case KEY_UP:
--position.row;
break;
case KEY_DOWN:
++position.row;
break;
case KEY_LEFT:
--position.col;
break;
case KEY_RIGHT:
++position.col;
break;
default:
// (Ignore all other keys.)
break;
}
}
//----------------------------------------------------
main()
{
Queue<V2> centipede;
int currentDirection;
int inputChar;
V2 currentHead;
// Configure ncurses.
configureNcurses();
// Fill queue (all centipede segments at start position).
currentHead.row = START_ROW;
currentHead.col = START_COL;
for (int i = 0; i < QUEUE_SIZE; ++i)
centipede.pushAndPop(currentHead);
// Draw instructions and initial centipede.
attron(COLOR_PAIR(2));
mvaddstr(1, 3, "USE ARROW KEYS TO MOVE, CTRL-C TO QUIT");
attroff(COLOR_PAIR(2));
drawCentipede(centipede, false);
refresh();
// Process input until killed.
currentDirection = KEY_RIGHT;
while (true) {
// Show current state, then check for input.
usleep(SLEEP_MICROSECONDS);
inputChar = getch();
if (inputChar != ERR)
currentDirection = inputChar;
// When input received, erase old centipede.
drawCentipede(centipede, true);
// Then use new input to update centipede.
updatePosition(currentHead, currentDirection);
centipede.pushAndPop(currentHead);
// Then draw new centipede, and refresh.
drawCentipede(centipede, false);
refresh();
}
// Clean up ncurses. (Re-display cursor.)
curs_set(1);
}
//----------------------------------------------------
pushAndPop使用x作爲參數名稱和循環變量名 - 根本不是一個好主意。另一個錯誤是指使用該模板看起來不正確。你需要顯示「調用」代碼。 – Mat
剛添加它！ – CCguy
那麼，對不起，調用代碼是無關緊要的。沒有正確讀取錯誤信息。 – Mat