class vector
{
public:
float x, z, y;
};
vector *vec;
vec = new vector;
float a = 5;
float b = 3;
vec->x = a;
vec->y = b;
printf("x: %f y:%f \n", vec->x, vec->y);
delete vec;
printf("x: %f y:%f \n", vec->x, vec->y);
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pointer and memory...
Author
Im working on my game engine, and wanted to delete unnecessary to make the engine run faster. This is the code Im using:
but this is the output:
--------------------------
x:5.0000000 y:3.0000000
x:0.0000000 y:3.0000000
--------------------------
it deletes the x variable, but dosen't delete y. Does anyone know what I'm doing wrong?
// vec exists here, so prints the expected values. // printf("x: %f y:%f \n", vec->x, vec->y); // after deleting vec, vec no longer exists delete vec; // the result of this line is now undefined since vec // no longer exists. The results you are seeing is due to // the fact that vec is now pointing to some random memory // location. printf("x: %f y:%f \n", vec->x, vec->y); // typically, after deleting memory from a pointer, // set it to NULL which will later alow you to check // to see if the pointer is valid vec=0; if(vec) printf("x: %f y:%f \n", vec->x, vec->y);
The proper way to delete a pointer is by filling it with garbage data, deleting it, and then setting it to NULL. This way its virtually shredded from memory.
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