C++ 调试错误的分配错误c++；
当我运行代码时，一切似乎都正常工作，但经过一定的时间步数（通常为~100，但每次的次数不同）后，我得到错误： “在抛出'std:：bad_alloc'实例后终止调用” 我真的不知道如何调试它，因为它不会在每次代码运行的同一点上发生。我将发布我的代码，但它相当长，而且承认有点混乱（这是我第一次真正尝试用c++编写程序），但我将尝试解释它的结构，以及我认为最可能出现错误的地方 基本结构是我有一个“birds”（我定义的一个类）数组，它通过一些相当复杂的计算选择如何在每一步更新自己。在这样做的过程中，它定期调用函数getVisualState来更新一个链接列表，每个鸟都将该列表存储为其“视觉状态”。我相信这是我在模拟过程中唯一一次动态分配内存，所以我想这很有可能是错误的根源。函数Bird:：resetVisualState（）应该在分配的内存被使用后将其清除（但看起来我并没有耗尽内存，至少在任务管理器中监视它） 如果有人能看到任何他们认为可能是问题根源的东西，那就太棒了，或者如果不只是关于我应该如何调试这个问题的任何建议C++ 调试错误的分配错误c++；,c++,memory,C++,Memory,当我运行代码时，一切似乎都正常工作，但经过一定的时间步数（通常为~100，但每次的次数不同）后，我得到错误： “在抛出'std:：bad_alloc'实例后终止调用” 我真的不知道如何调试它，因为它不会在每次代码运行的同一点上发生。我将发布我的代码，但它相当长，而且承认有点混乱（这是我第一次真正尝试用c++编写程序），但我将尝试解释它的结构，以及我认为最可能出现错误的地方 基本结构是我有一个“birds”（我定义的一个类）数组，它通过一些相当复杂的计算选择如何在每一步更新自己。在这样做的过程中，
#include <iostream>
#include <cmath>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
#include <ctime>
#include <vector>
#include <algorithm>
#include <fstream>
#include "birdClasses.h"
using namespace std;
/*
nBirds, nSteps, nF, v, dt, birdRad defined in "birdClasses.h"
*/
//define other parameters.
const int nSensors = 20;
const int nMoves = 3; //no. possible moves at each step.
double dTheta = 15*M_PI/180.0; //angle that birds can change their orientation by in a timestep.
double moves[nMoves] = {-dTheta, 0, dTheta}; //possible moves.
double noise = 0.0;
double initBoxX = 20, initBoxY = 20; //size of initial box particles are placed in.
double sensorFrac[nSensors];
double sensorRef[nSensors];
double sensorRange = 2*M_PI/((double)nSensors);
int counter = 0;
int nps = numStates(nMoves,nF);
int *possibleStates = new int[nps];
//variables to record positions and orientations.
double xPositions[nSteps][nBirds], yPositions[nSteps][nBirds], orientations[nSteps][nBirds];
//array to keep track of which collisions are possible.
int couldCollide[nF][nBirds][nBirds];
//function prototypes
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi);
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng);
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut);
int main()
{
sensorRef[0] = sensorRange;
for(int u=1; u<nSensors; u++) sensorRef[u] = sensorRef[u-1] + sensorRange;
//set up GSL random number generator.
const gsl_rng_type * Tr;
gsl_rng * RNG;
gsl_rng_env_setup();
Tr = gsl_rng_default;
RNG = gsl_rng_alloc (Tr);
gsl_rng_set(RNG,time(NULL));
//set up output
ofstream output("output.txt");
//initialize birds in a box randomly, all with the same orientation.
Bird birdList[nBirds];
for(int i=0; i<nBirds; i++) {
birdList[i].set_position(gsl_ran_flat(RNG,0,initBoxX),gsl_ran_flat(RNG,0,initBoxY));
}
//ACTUAL CODE
int uniqueVisStates[nMoves];
double cX, cY, fX, fY, exploreX, exploreY, exploreO;
//main time step loop
for(int ts=0; ts<nSteps; ts++) {
//save current positions
for(int i=0; i<nBirds; i++) {
xPositions[ts][i] = birdList[i].get_xPos();
yPositions[ts][i] = birdList[i].get_yPos();
orientations[ts][i] = birdList[i].get_orientation();
birdList[i].updateFuture();
}
//update list of possible collisions.
for(int nFut=0; nFut<nF; nFut++) {
for(int i=0; i<nBirds; i++) {
cX = birdList[i].get_xPos(); cY = birdList[i].get_yPos();
counter = 0;
for(int j=0; j<nBirds; j++) {
if(i==j) {
continue;
} else {
fX = birdList[j].get_futureX(nFut); fY = birdList[j].get_futureY(nFut);
if((cX-fX)*(cX-fX)+(cY-fY)*(cY-fY) < ((nFut+1)*v*dt+2*birdRad)*((nFut+1)*v*dt+2*birdRad)) {
couldCollide[nFut][i][counter]=j;
counter++;
}
}
}
if(counter < nBirds) couldCollide[nFut][i][counter]=-1;
}
}
//loop over birds to choose how they update their orientation.
for(int bn=0; bn<nBirds; bn++) {
//loop over possible moves bird can make NOW.
for(int l=0; l<nMoves; l++) {
uniqueVisStates[l]=0;
}
for(int mn=0; mn<nMoves; mn++) {
for(int l=0; l<nps; l++) {
possibleStates[l]=0;
}
counter = 0;
exploreO = birdList[bn].get_orientation() + moves[mn];
exploreX = birdList[bn].get_xPos() + cos(exploreO)*v*dt;
exploreY = birdList[bn].get_yPos() + sin(exploreO)*v*dt;
updateTree(exploreX,exploreY,exploreO,&birdList[0],bn,0);
vector<int> visStates (possibleStates,possibleStates+counter);
vector<int>::iterator it;
sort (visStates.begin(),visStates.end());
it = unique(visStates.begin(),visStates.end());
uniqueVisStates[mn] = distance(visStates.begin(),it);
}
int maxInd = 0, maxVal = uniqueVisStates[0];
for(int h=1; h<nMoves; h++) {
if(uniqueVisStates[h] > maxVal) {
maxInd = h; maxVal = uniqueVisStates[h];
} else if(uniqueVisStates[h]==maxVal) {
if(abs(moves[h])<abs(moves[maxInd])) {
maxInd = h;
}
}
}
birdList[bn].update_Orientation(moves[maxInd]);
birdList[bn].update_Pos(birdList[bn].get_xPos()+cos(birdList[bn].get_orientation())*v*dt,birdList[bn].get_yPos()+sin(birdList[bn].get_orientation())*v*dt);
}
for(int bn=0; bn<nBirds; bn++) birdList[bn].finishUpdate();
cout << ts << "\n";
}
//OUTPUT DATA INTO A TEXT FILE.
for(int ts=0; ts<(nSteps-1); ts++) {
for(int bn=0; bn<nBirds; bn++) {
output << xPositions[ts][bn] << " " << yPositions[ts][bn] << " " << orientations[ts][bn] << "\n";
}
}
delete[] possibleStates;
return 0;
}
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi) {
int cond = 1; int index, counti=0;
while(cond) {
index = couldCollide[nFut][i][counti];
if(index==-1) break;
double xj = birds[index].get_futureX(nFut);
double yj = birds[index].get_futureY(nFut);
if((xi-xj)*(xi-xj)+(yi-yj)*(yi-yj) < 4*birdRad*birdRad) {
return 1;
}
counti++;
if(counti==nBirds) break;
}
return 0;
}
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng) {
//finds the visual state of bird i based on its current "exploring position" and the predicted positions of other birds at timestep nFut.
//visual state is defined by discretizing the bird's field of view into nSensors (relative to current orientation) and creating a vector of
//0s and 1s depending on whether each sensor is < half covered or not. This is then converted to an integer (as we are actually interested only
//in the number of unique visual states.
double relX, relY, relDist, dAng, s, dTheta, ang1, ang2;
//clear current visual state.
birdList[i].resetVisualState();
for(int j=0; j<nBirds; j++) {
if(i==j) continue;
relX = birdList[j].get_futureX(nFut)-cX;
relY = birdList[j].get_futureY(nFut)-cY;
relDist = sqrt(relX*relX+relY*relY);
dAng = acos((cos(cAng)*relX+sin(cAng)*relY)/relDist);
dTheta = atan(birdRad/relDist);
s = cos(cAng)*relY - sin(cAng)*relX;
if( s<0 ) dAng = 2*M_PI-dAng;
ang1 = dAng - dTheta; ang2 = dAng + dTheta;
if( ang1 < 0 ) {
birdList[i].addInterval(0,ang2);
birdList[i].addInterval(2*M_PI+ang1,2*M_PI);
} else if( ang2 > 2*M_PI ) {
birdList[i].addInterval(0,fmod(ang2,2*M_PI));
birdList[i].addInterval(ang1,2*M_PI);
} else {
birdList[i].addInterval(ang1,ang2);
}
}
Node *sI = birdList[i].get_visualState();
birdList[i].cleanUp(sI);
int ind1, ind2;
for(int k=0; k<nSensors; k++) sensorFrac[k]=0.0; //initialize.
while(sI->next->next != 0) {
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
sI=sI->next->next;
}
//do final interval separately.
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
int output = 0, multiplier = 1;
for(int y=0; y<nSensors; y++) {
if(sensorFrac[y]>0.5) output += multiplier;
multiplier *= 2;
}
return output;
}
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut) {
double o,x,y;
if(checkCollision(bn,nFut,bird,exploreX,exploreY)) return;
int vs = getVisualState(bird,nFut,bn,exploreX,exploreY,exploreO);
possibleStates[counter] = vs;
counter++;
if(nFut < (nF-1)) {
for(int m=0; m<nMoves; m++) {
o = exploreO + moves[m];
x = exploreX + cos(o)*v*dt;
y = exploreY + sin(o)*v*dt;
updateTree(x,y,o,bird,bn,nFut+1);
}
} else {
return;
}
}
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#包括“birdClasses.h”
使用名称空间std；
/*
“BirdClass.h”中定义的NBIRD、NSTEP、nF、v、dt、birdRad
*/
//定义其他参数。
传感器常数=20；
常数int nMoves=3//不，每一步都有可能移动。
双dTheta=15*M_PI/180.0//鸟类可以在一个时间步长内改变方向的角度。
双动[nMoves]={-dTheta，0，dTheta}//可能的行动。
双噪声=0.0；
双initBoxX=20，initBoxY=20//放置的初始长方体粒子的大小。
双传感器FRAC[N传感器]；
双传感器参考[N传感器]；
双传感器量程=2*M_PI/（（双）N传感器）；
int计数器=0；
int nps=numStates（nMoves，nF）；
int*possiblestate=新的int[nps]；
//用于记录位置和方向的变量。
双X位置[nSteps][nBirds]、Y位置[nSteps][nBirds]、方向[nSteps][nBirds]；
//数组以跟踪哪些碰撞是可能的。
int可以碰撞[nF][nBirds][nBirds]；
//功能原型
席考碰撞（INTI，INT NFUT，鸟*鸟，双喜，双义）；
无符号长整型整型getVisualState（Bird*birdList、整型nFut、整型i、双cX、双cY、双cAng）；
void updateTree（双exploreX、双exploreY、双exploreO、Bird*Bird、int bn、int nFut）；
int main（）
{
sensorRef[0]=传感器范围；
对于（int u=1；u
或者，如果不是关于我应该如何调试它的任何建议
#include <iostream>
#include <cmath>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
#include <ctime>
#include <vector>
#include <algorithm>
#include <fstream>
#include "birdClasses.h"
using namespace std;
/*
nBirds, nSteps, nF, v, dt, birdRad defined in "birdClasses.h"
*/
//define other parameters.
const int nSensors = 20;
const int nMoves = 3; //no. possible moves at each step.
double dTheta = 15*M_PI/180.0; //angle that birds can change their orientation by in a timestep.
double moves[nMoves] = {-dTheta, 0, dTheta}; //possible moves.
double noise = 0.0;
double initBoxX = 20, initBoxY = 20; //size of initial box particles are placed in.
double sensorFrac[nSensors];
double sensorRef[nSensors];
double sensorRange = 2*M_PI/((double)nSensors);
int counter = 0;
int nps = numStates(nMoves,nF);
int *possibleStates = new int[nps];
//variables to record positions and orientations.
double xPositions[nSteps][nBirds], yPositions[nSteps][nBirds], orientations[nSteps][nBirds];
//array to keep track of which collisions are possible.
int couldCollide[nF][nBirds][nBirds];
//function prototypes
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi);
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng);
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut);
int main()
{
sensorRef[0] = sensorRange;
for(int u=1; u<nSensors; u++) sensorRef[u] = sensorRef[u-1] + sensorRange;
//set up GSL random number generator.
const gsl_rng_type * Tr;
gsl_rng * RNG;
gsl_rng_env_setup();
Tr = gsl_rng_default;
RNG = gsl_rng_alloc (Tr);
gsl_rng_set(RNG,time(NULL));
//set up output
ofstream output("output.txt");
//initialize birds in a box randomly, all with the same orientation.
Bird birdList[nBirds];
for(int i=0; i<nBirds; i++) {
birdList[i].set_position(gsl_ran_flat(RNG,0,initBoxX),gsl_ran_flat(RNG,0,initBoxY));
}
//ACTUAL CODE
int uniqueVisStates[nMoves];
double cX, cY, fX, fY, exploreX, exploreY, exploreO;
//main time step loop
for(int ts=0; ts<nSteps; ts++) {
//save current positions
for(int i=0; i<nBirds; i++) {
xPositions[ts][i] = birdList[i].get_xPos();
yPositions[ts][i] = birdList[i].get_yPos();
orientations[ts][i] = birdList[i].get_orientation();
birdList[i].updateFuture();
}
//update list of possible collisions.
for(int nFut=0; nFut<nF; nFut++) {
for(int i=0; i<nBirds; i++) {
cX = birdList[i].get_xPos(); cY = birdList[i].get_yPos();
counter = 0;
for(int j=0; j<nBirds; j++) {
if(i==j) {
continue;
} else {
fX = birdList[j].get_futureX(nFut); fY = birdList[j].get_futureY(nFut);
if((cX-fX)*(cX-fX)+(cY-fY)*(cY-fY) < ((nFut+1)*v*dt+2*birdRad)*((nFut+1)*v*dt+2*birdRad)) {
couldCollide[nFut][i][counter]=j;
counter++;
}
}
}
if(counter < nBirds) couldCollide[nFut][i][counter]=-1;
}
}
//loop over birds to choose how they update their orientation.
for(int bn=0; bn<nBirds; bn++) {
//loop over possible moves bird can make NOW.
for(int l=0; l<nMoves; l++) {
uniqueVisStates[l]=0;
}
for(int mn=0; mn<nMoves; mn++) {
for(int l=0; l<nps; l++) {
possibleStates[l]=0;
}
counter = 0;
exploreO = birdList[bn].get_orientation() + moves[mn];
exploreX = birdList[bn].get_xPos() + cos(exploreO)*v*dt;
exploreY = birdList[bn].get_yPos() + sin(exploreO)*v*dt;
updateTree(exploreX,exploreY,exploreO,&birdList[0],bn,0);
vector<int> visStates (possibleStates,possibleStates+counter);
vector<int>::iterator it;
sort (visStates.begin(),visStates.end());
it = unique(visStates.begin(),visStates.end());
uniqueVisStates[mn] = distance(visStates.begin(),it);
}
int maxInd = 0, maxVal = uniqueVisStates[0];
for(int h=1; h<nMoves; h++) {
if(uniqueVisStates[h] > maxVal) {
maxInd = h; maxVal = uniqueVisStates[h];
} else if(uniqueVisStates[h]==maxVal) {
if(abs(moves[h])<abs(moves[maxInd])) {
maxInd = h;
}
}
}
birdList[bn].update_Orientation(moves[maxInd]);
birdList[bn].update_Pos(birdList[bn].get_xPos()+cos(birdList[bn].get_orientation())*v*dt,birdList[bn].get_yPos()+sin(birdList[bn].get_orientation())*v*dt);
}
for(int bn=0; bn<nBirds; bn++) birdList[bn].finishUpdate();
cout << ts << "\n";
}
//OUTPUT DATA INTO A TEXT FILE.
for(int ts=0; ts<(nSteps-1); ts++) {
for(int bn=0; bn<nBirds; bn++) {
output << xPositions[ts][bn] << " " << yPositions[ts][bn] << " " << orientations[ts][bn] << "\n";
}
}
delete[] possibleStates;
return 0;
}
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi) {
int cond = 1; int index, counti=0;
while(cond) {
index = couldCollide[nFut][i][counti];
if(index==-1) break;
double xj = birds[index].get_futureX(nFut);
double yj = birds[index].get_futureY(nFut);
if((xi-xj)*(xi-xj)+(yi-yj)*(yi-yj) < 4*birdRad*birdRad) {
return 1;
}
counti++;
if(counti==nBirds) break;
}
return 0;
}
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng) {
//finds the visual state of bird i based on its current "exploring position" and the predicted positions of other birds at timestep nFut.
//visual state is defined by discretizing the bird's field of view into nSensors (relative to current orientation) and creating a vector of
//0s and 1s depending on whether each sensor is < half covered or not. This is then converted to an integer (as we are actually interested only
//in the number of unique visual states.
double relX, relY, relDist, dAng, s, dTheta, ang1, ang2;
//clear current visual state.
birdList[i].resetVisualState();
for(int j=0; j<nBirds; j++) {
if(i==j) continue;
relX = birdList[j].get_futureX(nFut)-cX;
relY = birdList[j].get_futureY(nFut)-cY;
relDist = sqrt(relX*relX+relY*relY);
dAng = acos((cos(cAng)*relX+sin(cAng)*relY)/relDist);
dTheta = atan(birdRad/relDist);
s = cos(cAng)*relY - sin(cAng)*relX;
if( s<0 ) dAng = 2*M_PI-dAng;
ang1 = dAng - dTheta; ang2 = dAng + dTheta;
if( ang1 < 0 ) {
birdList[i].addInterval(0,ang2);
birdList[i].addInterval(2*M_PI+ang1,2*M_PI);
} else if( ang2 > 2*M_PI ) {
birdList[i].addInterval(0,fmod(ang2,2*M_PI));
birdList[i].addInterval(ang1,2*M_PI);
} else {
birdList[i].addInterval(ang1,ang2);
}
}
Node *sI = birdList[i].get_visualState();
birdList[i].cleanUp(sI);
int ind1, ind2;
for(int k=0; k<nSensors; k++) sensorFrac[k]=0.0; //initialize.
while(sI->next->next != 0) {
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
sI=sI->next->next;
}
//do final interval separately.
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
int output = 0, multiplier = 1;
for(int y=0; y<nSensors; y++) {
if(sensorFrac[y]>0.5) output += multiplier;
multiplier *= 2;
}
return output;
}
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut) {
double o,x,y;
if(checkCollision(bn,nFut,bird,exploreX,exploreY)) return;
int vs = getVisualState(bird,nFut,bn,exploreX,exploreY,exploreO);
possibleStates[counter] = vs;
counter++;
if(nFut < (nF-1)) {
for(int m=0; m<nMoves; m++) {
o = exploreO + moves[m];
x = exploreX + cos(o)*v*dt;
y = exploreY + sin(o)*v*dt;
updateTree(x,y,o,bird,bn,nFut+1);
}
} else {
return;
}
}
您可以尝试在gdb中设置catchpoint以捕获std:：bad_alloc
异常：
(gdb) catch throw bad_alloc
（见附件）
如果您能够在gdb中复制此错误分配，那么您可以查看bt
以查看此异常的可能原因
或者，如果不是关于我应该如何调试它的任何建议
#include <iostream>
#include <cmath>
#include <gsl/gsl_rng.h>
#include <gsl/gsl_randist.h>
#include <ctime>
#include <vector>
#include <algorithm>
#include <fstream>
#include "birdClasses.h"
using namespace std;
/*
nBirds, nSteps, nF, v, dt, birdRad defined in "birdClasses.h"
*/
//define other parameters.
const int nSensors = 20;
const int nMoves = 3; //no. possible moves at each step.
double dTheta = 15*M_PI/180.0; //angle that birds can change their orientation by in a timestep.
double moves[nMoves] = {-dTheta, 0, dTheta}; //possible moves.
double noise = 0.0;
double initBoxX = 20, initBoxY = 20; //size of initial box particles are placed in.
double sensorFrac[nSensors];
double sensorRef[nSensors];
double sensorRange = 2*M_PI/((double)nSensors);
int counter = 0;
int nps = numStates(nMoves,nF);
int *possibleStates = new int[nps];
//variables to record positions and orientations.
double xPositions[nSteps][nBirds], yPositions[nSteps][nBirds], orientations[nSteps][nBirds];
//array to keep track of which collisions are possible.
int couldCollide[nF][nBirds][nBirds];
//function prototypes
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi);
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng);
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut);
int main()
{
sensorRef[0] = sensorRange;
for(int u=1; u<nSensors; u++) sensorRef[u] = sensorRef[u-1] + sensorRange;
//set up GSL random number generator.
const gsl_rng_type * Tr;
gsl_rng * RNG;
gsl_rng_env_setup();
Tr = gsl_rng_default;
RNG = gsl_rng_alloc (Tr);
gsl_rng_set(RNG,time(NULL));
//set up output
ofstream output("output.txt");
//initialize birds in a box randomly, all with the same orientation.
Bird birdList[nBirds];
for(int i=0; i<nBirds; i++) {
birdList[i].set_position(gsl_ran_flat(RNG,0,initBoxX),gsl_ran_flat(RNG,0,initBoxY));
}
//ACTUAL CODE
int uniqueVisStates[nMoves];
double cX, cY, fX, fY, exploreX, exploreY, exploreO;
//main time step loop
for(int ts=0; ts<nSteps; ts++) {
//save current positions
for(int i=0; i<nBirds; i++) {
xPositions[ts][i] = birdList[i].get_xPos();
yPositions[ts][i] = birdList[i].get_yPos();
orientations[ts][i] = birdList[i].get_orientation();
birdList[i].updateFuture();
}
//update list of possible collisions.
for(int nFut=0; nFut<nF; nFut++) {
for(int i=0; i<nBirds; i++) {
cX = birdList[i].get_xPos(); cY = birdList[i].get_yPos();
counter = 0;
for(int j=0; j<nBirds; j++) {
if(i==j) {
continue;
} else {
fX = birdList[j].get_futureX(nFut); fY = birdList[j].get_futureY(nFut);
if((cX-fX)*(cX-fX)+(cY-fY)*(cY-fY) < ((nFut+1)*v*dt+2*birdRad)*((nFut+1)*v*dt+2*birdRad)) {
couldCollide[nFut][i][counter]=j;
counter++;
}
}
}
if(counter < nBirds) couldCollide[nFut][i][counter]=-1;
}
}
//loop over birds to choose how they update their orientation.
for(int bn=0; bn<nBirds; bn++) {
//loop over possible moves bird can make NOW.
for(int l=0; l<nMoves; l++) {
uniqueVisStates[l]=0;
}
for(int mn=0; mn<nMoves; mn++) {
for(int l=0; l<nps; l++) {
possibleStates[l]=0;
}
counter = 0;
exploreO = birdList[bn].get_orientation() + moves[mn];
exploreX = birdList[bn].get_xPos() + cos(exploreO)*v*dt;
exploreY = birdList[bn].get_yPos() + sin(exploreO)*v*dt;
updateTree(exploreX,exploreY,exploreO,&birdList[0],bn,0);
vector<int> visStates (possibleStates,possibleStates+counter);
vector<int>::iterator it;
sort (visStates.begin(),visStates.end());
it = unique(visStates.begin(),visStates.end());
uniqueVisStates[mn] = distance(visStates.begin(),it);
}
int maxInd = 0, maxVal = uniqueVisStates[0];
for(int h=1; h<nMoves; h++) {
if(uniqueVisStates[h] > maxVal) {
maxInd = h; maxVal = uniqueVisStates[h];
} else if(uniqueVisStates[h]==maxVal) {
if(abs(moves[h])<abs(moves[maxInd])) {
maxInd = h;
}
}
}
birdList[bn].update_Orientation(moves[maxInd]);
birdList[bn].update_Pos(birdList[bn].get_xPos()+cos(birdList[bn].get_orientation())*v*dt,birdList[bn].get_yPos()+sin(birdList[bn].get_orientation())*v*dt);
}
for(int bn=0; bn<nBirds; bn++) birdList[bn].finishUpdate();
cout << ts << "\n";
}
//OUTPUT DATA INTO A TEXT FILE.
for(int ts=0; ts<(nSteps-1); ts++) {
for(int bn=0; bn<nBirds; bn++) {
output << xPositions[ts][bn] << " " << yPositions[ts][bn] << " " << orientations[ts][bn] << "\n";
}
}
delete[] possibleStates;
return 0;
}
bool checkCollision(int i, int nFut, Bird *birds, double xi, double yi) {
int cond = 1; int index, counti=0;
while(cond) {
index = couldCollide[nFut][i][counti];
if(index==-1) break;
double xj = birds[index].get_futureX(nFut);
double yj = birds[index].get_futureY(nFut);
if((xi-xj)*(xi-xj)+(yi-yj)*(yi-yj) < 4*birdRad*birdRad) {
return 1;
}
counti++;
if(counti==nBirds) break;
}
return 0;
}
unsigned long int getVisualState(Bird *birdList, int nFut, int i, double cX, double cY, double cAng) {
//finds the visual state of bird i based on its current "exploring position" and the predicted positions of other birds at timestep nFut.
//visual state is defined by discretizing the bird's field of view into nSensors (relative to current orientation) and creating a vector of
//0s and 1s depending on whether each sensor is < half covered or not. This is then converted to an integer (as we are actually interested only
//in the number of unique visual states.
double relX, relY, relDist, dAng, s, dTheta, ang1, ang2;
//clear current visual state.
birdList[i].resetVisualState();
for(int j=0; j<nBirds; j++) {
if(i==j) continue;
relX = birdList[j].get_futureX(nFut)-cX;
relY = birdList[j].get_futureY(nFut)-cY;
relDist = sqrt(relX*relX+relY*relY);
dAng = acos((cos(cAng)*relX+sin(cAng)*relY)/relDist);
dTheta = atan(birdRad/relDist);
s = cos(cAng)*relY - sin(cAng)*relX;
if( s<0 ) dAng = 2*M_PI-dAng;
ang1 = dAng - dTheta; ang2 = dAng + dTheta;
if( ang1 < 0 ) {
birdList[i].addInterval(0,ang2);
birdList[i].addInterval(2*M_PI+ang1,2*M_PI);
} else if( ang2 > 2*M_PI ) {
birdList[i].addInterval(0,fmod(ang2,2*M_PI));
birdList[i].addInterval(ang1,2*M_PI);
} else {
birdList[i].addInterval(ang1,ang2);
}
}
Node *sI = birdList[i].get_visualState();
birdList[i].cleanUp(sI);
int ind1, ind2;
for(int k=0; k<nSensors; k++) sensorFrac[k]=0.0; //initialize.
while(sI->next->next != 0) {
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
sI=sI->next->next;
}
//do final interval separately.
ang1 = sI->value; ang2 = sI->next->value;
ind1 = floor(ang1/sensorRange); ind2 = floor(ang2/sensorRange);
if(ind2==nSensors) ind2--; //this happens if ang2 = 2pi (which can happen a lot).
if(ind1==ind2) {
sensorFrac[ind1] += (ang2-ang1)/sensorRange;
} else if(ind2-ind1==1) {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind1])/sensorRange;
} else {
sensorFrac[ind1] += (sensorRef[ind1]-ang1)/sensorRange;
sensorFrac[ind2] += (ang2-sensorRef[ind2-1])/sensorRange;
for(int y=ind1+1;y<ind2;y++) sensorFrac[y] = 1.0;
}
int output = 0, multiplier = 1;
for(int y=0; y<nSensors; y++) {
if(sensorFrac[y]>0.5) output += multiplier;
multiplier *= 2;
}
return output;
}
void updateTree(double exploreX, double exploreY, double exploreO, Bird *bird, int bn, int nFut) {
double o,x,y;
if(checkCollision(bn,nFut,bird,exploreX,exploreY)) return;
int vs = getVisualState(bird,nFut,bn,exploreX,exploreY,exploreO);
possibleStates[counter] = vs;
counter++;
if(nFut < (nF-1)) {
for(int m=0; m<nMoves; m++) {
o = exploreO + moves[m];
x = exploreX + cos(o)*v*dt;
y = exploreY + sin(o)*v*dt;
updateTree(x,y,o,bird,bn,nFut+1);
}
} else {
return;
}
}
您可以尝试在gdb中设置catchpoint以捕获std:：bad_alloc
异常：
(gdb) catch throw bad_alloc
（见附件）
如果您能够在gdb中复制这个错误的配置，那么您可以查看bt
，查看此异常的可能原因。我认为这是一个逻辑错误，不一定与内存有关
在void addInterval（双l，双r）中，您声明
Node *curr_L = visualState;
Node *prev_L = visualState;
这些指针现在将指向成员visualState指向的任何对象
稍后，您将更改visualState以指向新创建的节点
Node *newRoot = new Node;
// ....
if(curr_L == visualState) {
visualState = newRoot;
但是您的指针curr\u L和prev\u L仍将指向visualState以前指向的任何对象。更改这些指针的唯一时间是在
if(curr_L->next->next != 0) {
prev_L = curr_L;
curr_L = curr_L->next->next;
这和
if(WHATEVER_VISUAL_STATE_USED_TO_POINT_TO->next->next != 0) {
prev_L = curr_L;
curr_L = curr_L->next->next;
这是您的意图吗？您可以通过在编辑器中查找*curr\u L=*来遵循curr\u L的赋值
我建议在一个小数据样本上测试您的代码，并确保您的代码符合您的意图。使用调试器或跟踪输出。使用
如果您有权访问它，我想您会喜欢valgrind。我认为这是一个逻辑错误，不一定与内存有关
在void addInterval（双l，双r）中，您声明
Node *curr_L = visualState;
Node *prev_L = visualState;
这些指针现在将指向成员visualState指向的任何对象
稍后，您将更改visualState以指向新创建的节点
Node *newRoot = new Node;
// ....
if(curr_L == visualState) {
visualState = newRoot;
但是您的指针curr\u L和prev\u L仍将指向visualState以前指向的任何对象。更改这些指针的唯一时间是在
if(curr_L->next->next != 0) {
prev_L = curr_L;
curr_L = curr_L->next->next;
这和
if(WHATEVER_VISUAL_STATE_USED_TO_POINT_TO->next->next != 0) {
prev_L = curr_L;
curr_L = curr_L->next->next;
这是您的意图吗？您可以通过在编辑器中查找*curr\u L=*来遵循curr\u L的赋值
我建议在一个小数据样本上测试您的代码，并确保您的代码符合您的意图。使用调试器或跟踪输出。使用
如果你能访问它，我想你会很感激valgrind。如果你停止删除东西，错误会消失吗？@NeilGatenby那肯定会让问题变得更糟。std:：bad_alloc
是指当你尝试新建时，没有足够的堆内存可供分配。故意泄漏内存无助于此p问题。如果你没有删除代码，那么情况会变得更糟，如果答案是“是”，那么它有助于追踪原因你为可能的属性分配了多少元素？你创建了多少节点对象？你新建了多少内容（或新建[]
）？你删除了多少内容（或delete[]
）完成后删除所有内容？您是否想过一种更动态的算法，不需要立即将所有内容保存在内存中？您在玩一个危险的游戏。Bird的析构函数不会删除视觉状态，而我