我正在创建一个自定义堆栈，以与使用堆栈库的旧类一起使用。
编译时出现以下错误:
错误 C2955:“CELL”:类模板的使用需要模板参数列表 C++ 堆栈
它使用包含的 .h 文件进行编译，直到我将堆栈(c++ 库)更改为 my_Stack(自定义堆栈)
h的代码如下
#ifndef generic_stack_H
#define generic_stack_H
#include <iostream>
using namespace std;
/**************************************************************************
Structure CELL has two fields.
------------------ ------------------
| element | next | -> | element | next |
------------------ ------------------
**************************************************************************/
template <class T>
struct CELL { T element; struct CELL *next; };
/**************************************************************************
Class STACK.
**************************************************************************/
template <class T>
class my_STACK
{
private: CELL *topCellPtr;
public:
//----------------------------Constructor-----------------------------
my_STACK() {topCellPtr = NULL;}
//--------------------------Member functions--------------------------
void push(T e)
{
struct CELL *cP;
cP = new CELL;
cP->element = e;
cP->next = NULL;
if(topCellPtr != NULL)
cP->next = topCellPtr;
topCellPtr = cP;
}
void pop()
{
struct CELL *cP;
if(topCellPtr == NULL)
{
cout << "Trying to pop an empty stack." << endl;
return;
}
cP = topCellPtr;
topCellPtr = topCellPtr->next;
}
bool empty() {
bool check false;
struct CELL *cP;
if(topCellPtr == NULL)
{
check = true;
}
return true;
}
T top() {return topCellPtr->element;}
void print()
{
struct CELL *cP = topCellPtr;
cout << "Stack (top = left): ";
while (cP != NULL)
{
cout << cP->element << " -> ";
cP = cP->next;
}
cout << endl;
}
int Count_Occurences (int e) {
int count = 0;
struct CELL *cP = topCellPtr;
while(cP != NULL) {
if(cP->element == e) {
count++;
}//end if
cP = cP->next;
}//end while
return count;
}
void Reverse_Stack() {
struct CELL *nP = NULL;
struct CELL *newtopCellPtr = nP;
while(topCellPtr != NULL) {
int n = this->top();
this->pop();
nP = new CELL;
nP->element = n;
nP->next = NULL;
if(newtopCellPtr != NULL) {
nP->next = newtopCellPtr;
}
newtopCellPtr = nP;
}//end while
topCellPtr = newtopCellPtr;
}
int nth(int index) {
struct CELL *cP = topCellPtr;
for(int i=1; i < index; i++) {
cP = cP->next;
}//end for
return cP->element;
}
void Append (my_STACK anotherStack) {
anotherStack.Reverse_Stack();
while(anotherStack.topCellPtr != NULL) {
this->push(anotherStack.top());
anotherStack.pop();
}//
end while
}
};
#endif
我的主要功能如下:
#include <iostream> /*input output stream...
print on screen... keyboard input*/
//#include <stack> //stack implementaiton
#include <ctype.h>
#include <string>
#include "generic_stack.h"
using namespace std;/*instead of specifically typing
std::cout we can simply write cout
this package also includes stack
container*/
enum state {FRESH, ID, NUM, ICT, LESS, GREATER, LESSDASH, PLUS, MINUS, ERR};
void reverse(my_STACK<char> &s) {
my_STACK<char> s2;
while(!s.empty()) {
s2.push(s.top());
s.pop();
}
s = s2;
}
void Reverse_Stack_Stack(my_STACK< my_STACK<char> > &s) {
my_STACK< my_STACK<char> > s2;
while(!s.empty()) {
s2.push(s.top());
s.pop();
}
s = s2;
}
void newLine(my_STACK<char> &P , state ¤t_state) {
current_state = FRESH;
while(!P.empty()) {
P.pop();
}
}
bool isToken(state s) {
if(s == FRESH) {
return false;
} else if (s == ERR) {
return false;
} else {
return true;
}
}
bool canPush(char s , state current_state) {
if(current_state == FRESH) {
return true;
} else
if(current_state == NUM) {
if(isdigit(s)) {
return true;
} else {
return false;
}
} else
if(current_state == ID) {
if(isalpha(s)) {
return true;
} else {
return false;
}
} else
if(current_state == LESSDASH) {
if(s == '>') {
return true;
} else {
return false;
}
}/*end lessdash*/ else
if(current_state == LESS) {
if(s == '=' || s == '-' || s == '>') {
return true;
} else {
return false;
}
}/*end less */ else
if(current_state == GREATER) {
if(s == '=') {
return true;
} else {
return false;
}
}/*end greater*/ else
if(current_state == PLUS) {
if(s == '+') {
return true;
} else {
return false;
}
}/*end plus*/ else
if(current_state == MINUS) {
if(s == '>') {
return true;
} else {
return false;
}
}/*end minus */ else {
return false;
}
}
state nextState(state current_state, char c) {
if(current_state == LESS && c == '-') {
return LESSDASH;
} else
if(c == '<') {
return LESS;
} else
if(c == '>') {
return GREATER;
} else
if(c == '+') {
return PLUS;
} else
if(c == '-') {
return MINUS;
} else
if(isalpha(c) || c == '_') {
return ID;
} else
if(isdigit(c)) {
return NUM;
} else
if(c == '~' || c == '&' || c == '^' || c == '*' || c == '(' || c == ')' || c == '[' || c == ']' || c == ':' || c == ',' || c == '=') {
return ICT;
} else {
return ERR;
}
}
my_STACK< my_STACK<char> > maxMunch(my_STACK<char> S) {
my_STACK<char> P;
my_STACK< my_STACK<char> > T;
state current_state = FRESH;
while(!S.empty()) {
while(S.top() == ' ' || S.top() == '\t' || S.top() == '\r' || S.top() == '\n') {
S.pop();
if(!P.empty()) {
T.push(P);
while(!P.empty()) {
P.pop();
}
}
current_state = FRESH;
}//end second loop
if(canPush(S.top() , current_state)) {
P.push(S.top());
current_state = nextState(current_state, S.top());
S.pop();
} else {
if(isToken(current_state)/*P is a valid token*/) {
T.push(P);
newLine(P , current_state);
} else {
cout << "Tokenizing Error";
newLine(P , current_state);
}//end else
}
}//end loop
T.push(P);
if(S.empty()) {
return T;//returns the tokens
}
}
/**************************************************************************
Takes a string s and a stack theStack by refernce. Breaks the stirng s into
char data types and pushes them into the stack theStack.
***************************************************************************/
void Break_Up_Into_Stack(string s, my_STACK<char> &theStack)
{
while (!theStack.empty()) {theStack.pop();} // empty the stack before use.
for ( int pos = s.length() - 1; pos >= 0; pos--)
theStack.push(s.at(pos));
}
/**************************************************************************
Takes a stack of chars s by value. Prints the stack on screen.
***************************************************************************/
void Print_Stack_Of_Char (my_STACK<char> s)
{
cout << "-----top of stack: -----" << endl;
while (!s.empty()) {cout << s.top(); s.pop();}
cout << endl;
cout << "---Bottom of stack: ----" << endl << endl;
}
void printMunch (my_STACK< my_STACK<char>> s)
{
while (!s.empty()) {
Print_Stack_Of_Char (s.top());
cout << "" << endl;
s.pop();
}
}
void Print_Tokens (my_STACK<my_STACK<char> > s)
{
int count = 1;
Reverse_Stack_Stack(s);
while (s.empty() == false)
{
cout << count << ". ";
reverse (s.top());
while (s.top().empty() == false)
{
cout << s.top().top();
s.top().pop();
}
cout << endl;
count++;
s.pop();
}
}
int main() //main function
{
//state A = GREATER;
//char c = '-';
//cout << canPush(c, A) << endl;
string inputString;
my_STACK<char> charStack;
cout << "Enter the string: ";
getline(cin, inputString);
string testString1 = "83 - 8 * [aVar - (2 + 1)] / aVar2";
string testString2 = "amountOfWork <= 1";
Break_Up_Into_Stack(inputString, charStack);
//Print_Stack_Of_Char(charStack);
//reverse(charStack);
my_STACK <my_STACK<char> > Final;
Final = maxMunch(charStack);
Print_Tokens(Final);
//printMunch(Final);
char inp;
cin>>inp;
}
我不知道错误可能是什么，我尝试了很多方法，但都不起作用。该程序使用原始堆栈，但我需要实现自定义堆栈。
如有任何帮助，我们将不胜感激。
谢谢
编辑:
这是编译器的输出:
1>------ Build started: Project: project_7, Configuration: Debug Win32 ------
1> main.cpp
1>c:\users\administrator\documents\visual studio 2010\projects\project_7\project_7\generic_stack.h(29): error C2143: syntax error : missing ';' before 'template'
1>c:\users\administrator\documents\visual studio 2010\projects\project_7\project_7\main.cpp(23): error C2039: 'empty' : is not a member of 'my_STACK<T>'
1> with
1> [
1> T=char
1> ]
1>c:\users\administrator\documents\visual studio 2010\projects\project_7\project_7\main.cpp(23): fatal error C1903: unable to recover from previous error(s); stopping compilation
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
最佳答案
template <class T>
struct CELL { T element; struct CELL *next; };
template <class T>
class my_STACK
{
private: CELL *topCellPtr;
您将 CELL 声明为编译器可以用来创建类的模板。重要的是要注意 CELL 在技术上不是一个类。因此你不能有指向它的指针。您必须告诉 my_STACK topCellPtr 指向哪个类，所以该行应该是:
private: CELL<T> *topCellPtr;
您可能必须在整个 my_STACK 的代码中执行此操作。
关于c++ - 错误 C2955 : 'CELL' : use of class template requires template argument list C++ Stack，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10145302/