我有一个相当大的c ++程序，包括一个“Character”类。在“Character.h”中，首先声明struct CharacterSettings，然后声明Character类（包括它们的构造函数）。
Character（以及其他）具有CharacterSettings *设置和Point pos。 CharacterSettings有一个Point preferredVelocity。
这很好用。
但是，当我向Character添加任何公共变量时，程序会在我调用它时崩溃：
drawLine(character.pos, character.pos+character.settings->preferredVelocity, character.radius/3.0, 128, 80, 0);
该程序在此行崩溃：
Point operator + (const Point &p2) const
{ return Point(x + p2.x, y + p2.y); }
我认为它正在尝试做character.pos + character.settings-＆gt; preferredVelocity。我得到的错误信息是
Unhandled exception at 0x004bc4fc in ECMCrowdSimulation.exe: 0xC0000005: Access violation reading location 0x7f80000f.
当我看到它时，p2.x和p2.y未定义。没有额外的变量，他们不是。我完全不知道发生了什么，如何开始调试或者需要哪些信息来帮助我！任何帮助将不胜感激！
编辑：这里至少是Character.h文件！
#pragma once
/*
* ECM navigation mesh / crowd simulation software
* (c) Roland Geraerts and Wouter van Toll, Utrecht University.
* ---
* Character: A single moving character in the simulation.
*/
#include "../ECM/GraphComponents/CMNode.h"
#include "VectorOperation.h"
#include "IndicativeRoute.h"
#include "float.h"
#define _USE_MATH_DEFINES
#include <math.h>
#include <vector>
using std::vector;
#include <queue>
using std::queue;
#define CHARACTER_RELAXATIONTIME 0.5f
typedef vector<CMNode>::iterator node_ptr;
class Corridor;
class CMMResult;
struct CMEdge;
class CMMInterface;
class MicroInterface;
class CMMSceneTransfer;
struct CharacterSettings
{
private:
bool index_bb_initialized, index_bb_cp_initialized, index_ir_circle_initialized, index_ir_circle_mu_initialized;
bool index_2nd_ir_circle_initialized, index_2nd_ir_circle_mu_initialized;
public:
// --- Unique identifier within the simulation
int id;
// --- Velocity and speed
Point preferredVelocity;// Newly computed velocity *before* local collision avoidance
Point newVelocity; // Newly computed velocity (+ collision avoidance), to be applied in the "next" simulation step
float total_max_speed; // Maximum possible speed throughout the entire simulation
float max_speed; // Maximum speed at this point in time
float min_desired_speed;// Minimum speed that the character tries to reach when it is not standing still
Point lastAttractionPoint;
// --- IRM parameters
CMMInterface* cmmImplementation; // the type of indicative route to follow within the corridor, e.g. "shortest path" or "weighted side".
// Only used in WEIGHTED_SIDE:
float sidePreference; // bias to following a certain "side" of the corridor. Must be between -1 (left) and 1 (right).
float sidePreferenceNoise; // extra noise factor that will be added to sidePreference at each route element.
// Used in WEIGHTED_SIDE and SHORTEST_PATH
float preferred_clearance; // Distance (m) by which the agent prefers to stay away from obstacles.
// --- Micro simulation model (e.g. for collision avoidance between characters)
MicroInterface* microImplementation;// the local model to use
short micro_maxNrNeighbours; // the number of neighbours to check in the local model
float micro_personalSpaceRadius; // radius of the personal space (m), on top of the character's physical radius.
// Entering this disk (radius + personalSpace) is seen as a 'collision'.
// --- Corridor/Path pointers
node_ptr index_bb; // point on backbone path (used for computing attraction force)
node_ptr index_bb_cp; // point on the backbone path(used for computing the closest point)
curve_ptr index_ir_circle; // index to last point on the indicative route that intersects with a circle
float index_ir_circle_mu; // factor wrt to point on the indicative route that intersects with a circle
friend Character; // only the Character class can look into private members (WvT: ugly C++ practice, but it does work)
CharacterSettings(int _id,
// speed
float _total_max_speed, float _min_desired_speed,
// type of indicative route
CMMInterface* _cmmImplementation, float _sidePreference, float _sidePreferenceNoise, float _clearance,
// type of micro simulation model
MicroInterface* _microImplementation) :
id(_id), total_max_speed(_total_max_speed), min_desired_speed(_min_desired_speed),
cmmImplementation(_cmmImplementation), sidePreference(_sidePreference), sidePreferenceNoise(_sidePreferenceNoise), preferred_clearance(_clearance),
microImplementation(_microImplementation)
{
// velocities
newVelocity = Point(0, 0);
max_speed = total_max_speed;
preferredVelocity = Point(0, 0);
// corridor/IRM pointers
index_bb_initialized = false;
index_bb_cp_initialized = false;
index_ir_circle_initialized = false;
index_ir_circle_mu_initialized = false;
// default micro settings
micro_maxNrNeighbours = 5; // default for Karamouzas 2010: 5
micro_personalSpaceRadius = 0.0f; // default for Karamouzas 2010: 0.5
}
};
class Character
{
public:
Point pos;
float radius;
Point prevPos;
int i; //The thing that is pretending to be the culprit, without this, it works fine.
// goal data
Point goalPos;
float goalRadius;
// status flags
bool reachedGoal;
bool freeze; // whether or not the character is temporarily frozen
bool freezeNotified;
bool reachedDestSet;
Point velocity; // last used velocity
// corridor/path pointers
Point retraction, cp;
//Contains more detailed settings of agent
CharacterSettings * settings;
public:
// --- constructor
Character(int _id, Point &_pos, float _radius,
// speeds
float _total_max_speed, float _min_desired_speed,
// type of indicative route
CMMInterface* _cmmImplementation, float _sidePreference, float _sidePreferenceNoise, float _clearance,
// type of micro simulation model
MicroInterface* _microImplementation) :
pos(_pos), radius(_radius)
{
settings = new CharacterSettings(_id, _total_max_speed, _min_desired_speed,
_cmmImplementation, _sidePreference, _sidePreferenceNoise, _clearance, _microImplementation);
velocity = Point(0, 0);
prevPos=_pos;
reachedGoal = true;
freeze = false;
freezeNotified = false;
reachedDestSet = false;
//isProxy = false;
}
// --- destructor
void removeSettings();
// computing the new actual velocity through an acceleration vector: Euler integration
inline void integrateEuler(const Point &acc, float dtSim)
{
settings->newVelocity = velocity + dtSim * acc;
trim(settings->newVelocity, settings->max_speed);
}
inline void updatePos(float dtSim)
{
prevPos=pos;
// update velocity
velocity = settings->newVelocity;
// update position
pos += dtSim * velocity;
// if the character is close to its goal, it should stop moving
if(!reachedGoal // goal was not already reached
&& settings->lastAttractionPoint == goalPos
&& distSqr(pos, goalPos) < 0.25)//goalRadius)
{
reachedGoal = true;
// (do not reset the velocity, so that we can keep the last walking direction)
}
}
void resetIndices();
node_ptr &getIndex_bb(Corridor &corridor);
node_ptr &getIndex_bb_cp(Corridor &corridor);
curve_ptr &getIndex_ir_circle(IndicativeRoute &ir);
float &getIndex_ir_circle_mu();
Point &getRetraction() { return retraction; }
Point &getClosestPoint() { return cp; }
// computing the cost of some edge (in A*), by using personal preferences
float getEdgeCost(const CMEdge& edge, float activeFraction);
// computing the character's area, based on its radius
float getArea() const;
};
使一切崩溃的事情是添加'int i'。
答案 0 :(得分：8)
如果使用与使用较新版本编译的标题链接的旧版本标题编译的文件之间存在不兼容性，通常会发生类似奇怪的问题。在这种情况下，两个文件之间的对象布局可能不同（至少，sizeof不同）。
因此，在一个文件中，对象的一切看起来都是正确的，但是一旦传递给另一个文件中的函数，就会得到完全随机的行为。
在这种情况下，重建整个项目可以解决问题。更好的是，如果您手动编写Makefile，请尝试修复依赖项。如果您使用的是gcc / g ++，则可以使用这样的命令生成Makefile可接受的依赖项：
g++ -MM -MG -Ipath/to/includes/that/should/be/part/of/dependency *.cpp