不知道这里发生了什么。我有一个标准的 Vector3D 堆栈(我的导师给我的一个 3 维矢量类)。我已经将两个 Vector3D 推到堆栈上,但是当我使用 vectorStack.top() 进入顶部时,我遇到了这个非常无用的错误:
调试断言失败!
表达式:deque 迭代器不可取消引用
我认为 Vector3D 复制构造函数可能有问题,但我尝试制作自己的快速 Vector3D 结构(删除给我的旧结构),但这也不起作用!
这是代码:
D3Dapp.cpp
if (!lsys.initialised)
{
LSystem::ReproductionRule r1;
r1.from = 'F';
r1.to = "F+F-[FFF]";
lsys.rules.push_back(r1);
LSystem::ReproductionRule r2;
r2.from = 'F';
r2.to = "FF";
lsys.rules.push_back(r2);
lsys.result = lsys.generateResult("F", 0, 5);
lsys.currentPosition = Vector3D(0.0f,0.0f,0.0f);
lsys.vectorStack.push(lsys.currentPosition);
lsys.initialised = true;
}
lsys.result = "[FF]+FF";
if (!lsys.complete)
{
for (int i=0; i < lsys.result.length();i++)
{
// F move forward
if (lsys.result[i] == 'F')
{
float cosAng = cos(lsys.angle);
float sinAng = sin(lsys.angle);
Vector3D currentPosition(lsys.vectorStack.top());
Vector3D newPosition = Vector3D(
currentPosition.x + (cosAng * 0.5f),
currentPosition.y + (sinAng * 0.5f),
currentPosition.z);
//lsys.vectorStack.push(newPosition);
Vertex s, e;
s.x = currentPosition.x;
s.y = currentPosition.y;
s.z = currentPosition.z;
e.x = newPosition.x;
e.y = newPosition.y;
e.z = newPosition.z;
startList.push_back(s);
endList.push_back(e);
lsys.currentPosition = newPosition;
// + turn right
} else if (lsys.result[i] == '+')
{
float rdn = 3.141592f / 180.0f;
lsys.angle = (lsys.angle + 20.0f);
// - turn left
} else if (lsys.result[i] == '-')
{
float rdn = 3.141592f / 180.0f;
lsys.angle = (lsys.angle - 20.0f);
// [ push stack
} else if (lsys.result[i] == '[')
{
lsys.vectorStack.push(lsys.currentPosition);
// ] pop stack
} else if (lsys.result[i] == ']')
{
lsys.vectorStack.pop();
}
}
lsys.currentPosition = Vector3D(0.0f,0.0f,0.0f);
}
lsys.complete = true;
lsystem 中的堆栈只是stack<Vector3D> vectorStack;
我尝试了多种将 vectorStack.top() 分配给当前位置的方法,但似乎没有任何效果。
为了完整起见,这里是 Vector3D 的构造函数:
Vector3D.h
Vector3D() {
x = y = z = 0;
}
Vector3D(double a, double b, double c) {
x = a;
y = b;
z = c;
}
Vector3D(const Vector3D& v) {
x = v.x;
y = v.y;
z = v.z;
}
编辑:为了证明堆栈中有东西
这是堆栈中引发错误的行