我在模板方面遇到了一些麻烦。由于某种原因，我的模板本身看起来很好，但是当我因某种原因尝试使用它时，即使我知道我正确使用它也会出错。该模板用于一个简单的链表，用于保存子Shape类和CustomShape类。此代码适用于学校，因此如果您只能评论与模板相关的错误，那将是很好的。我已经阅读了关于这个主题的其他帖子，但似乎没有任何帮助/解决我的问题。
使用Visual Studio 2015的错误：
1>------ Build started: Project: a2_warn1700, Configuration: Debug Win32 ------
1> LinkedList.cpp
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2143: syntax error: missing ';' before '<'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2238: unexpected token(s) preceding ';'
1> Generating Code...
1> Compiling...
1> CustomShape.cpp
1> Generating Code...
1> Compiling...
1> main.cpp
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2143: syntax error: missing ';' before '<'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2238: unexpected token(s) preceding ';'
1> World.cpp
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2143: syntax error: missing ';' before '<'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(14): error C2238: unexpected token(s) preceding ';'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(17): error C2039: 'shapeComponents': is not a member of 'CustomShape'
1> c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(9): note: see declaration of 'CustomShape'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(17): error C2228: left of '.isNext' must have class/struct/union
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(18): error C2039: 'shapeComponents': is not a member of 'CustomShape'
1> c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\customshape.h(9): note: see declaration of 'CustomShape'
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(18): error C2228: left of '.next' must have class/struct/union
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(19): error C3536: 'shape': cannot be used before it is initialized
1>c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(19): error C2227: left of '->draw' must point to class/struct/union/generic type
1> c:\users\user\documents\laurier\fall 2016\cp411\a2_warn1700\a2_warn1700\world.cpp(19): note: type is 'int'
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
LinkedList.cpp
#include "LinkedList.h"
template <class T> void LinkedList<T>::insert(T* newObject) {
if (size == 0) {
size++;
root = new LinkedList::Node();
root->obj = newObject;
lastNode = root;
currentNode = root;
}
else {
LinkedList::Node *nextNode = root;
while (nextNode->next != nullptr) {
nextNode = nextNode->next;
}
LinkedList::Node *prevNode = nextNode;
nextNode->next = new LinkedList::Node();
nextNode = nextNode->next;
nextNode->prev = prevNode;
nextNode->obj = newObject;
lastNode = nextNode;
}
}
template <class T> typename T* LinkedList<T>::next() {
T* object;
if (currentNode != nullptr) {
object = currentNode->obj;
currentNode = currentNode->next;
}
return object;
}
template <class T> bool LinkedList<T>::isNext() {
bool moreVal = false;
// check if there are more values
if (currentNode != nullptr) {
moreVal = true;
}
else {
currentNode = root;
}
return moreVal;
}
template <class T> void LinkedList<T>::destroy() {
Node *nextNode = root;
while (nextNode->next != nullptr) {
Node *temp = nextNode;
nextNode = nextNode->next;
delete temp;
}
delete root;
delete currentNode;
delete lastNode;
size = 0;
root = new Node();
currentNode = root;
lastNode = root;
}
template <class T> typename T* LinkedList<T>::getRoot() {
T* object = this->root->obj;
return object;
}
template class LinkedList<Shape>;
template class LinkedList<CustomShape>;
LinkedList.h
#pragma once
#include "Shape.h"
#include "CustomShape.h"
template <class T>
class LinkedList
{
public:
LinkedList<T>::LinkedList() {};
LinkedList<T>::~LinkedList() {};
void insert(T* newObject);
T* next();
bool isNext();
void destroy();
T* getRoot();
private:
struct Node {
T* obj;
Node* next = nullptr;
Node* prev = nullptr;
};
int size = 0;
Node *root = nullptr;
Node *lastNode = nullptr;
Node *currentNode = nullptr;
};
World.h
#pragma once
#include "LinkedList.h"
#include "Shape.h"
#include "Cube.h"
#include "CustomShape.h"
#include <iostream>
class World
{
public:
World();
~World();
void drawWorld();
private:
LinkedList<CustomShape> worldObjects;
};
World.cpp
#include "World.h"
World::World() {
CustomShape* cShape = new CustomShape();
cShape->insertShape(new Cube);
worldObjects.insert(cShape);
}
World::~World() {
this->worldObjects.destroy();
}
void World::drawWorld() {
while (worldObjects.isNext()) {
auto cShape = worldObjects.next();
while (cShape->shapeComponents.isNext()) {
auto shape = cShape->shapeComponents.next();
shape->draw();
}
}
}
CustomShape.h
#pragma once
#include "GL\glut.h"
#include "LinkedList.h"
#include "Point.h"
#include "Shape.h"
class CustomShape
{
public:
CustomShape();
~CustomShape();
void insertShape(Shape* shape);
LinkedList<Shape> shapeComponents;
void drawSelected();
Point originPoint;
};
提前致谢。