c++ - Vector Public in Class - Can't Use in Implementation? -

here's situation. have class in have defined vector publicly, below:

class trackobjects { public:      vector<movingobj> movingobjects;  ... 

etc.

it has constructor , everything. have separate .cpp file implementations i'm trying use vector , methods on vector. 1 example, it's part of condition in function so:

if (movingobjects.locx >= x1) 

...

etc.

it tells me movingobjects undeclared, , first use function. it's not function, , knowledge, haven't called one/tried use one.

can suggest why might getting error?

edit: locx public variable in class movingobj. trackobj class creates vector objects movingobj creates. sorry, should've specified that. so:

class movingobj {

public:

movingobj(int inid, int inlocx, int inlocy, int inwidth, int inheight);

int id, locx, locy,width,height;

based on telling us, proper way access locx along lines of:

trackobjects objs; objs.movingobjects[15].locx = 123.45;  

or, maybe:

if(objs.movingobjects[15].locx >= 15) {     //do } 

you can encapsulate access method in trackobjects (put in trackobjects.cpp implementation):

bool trackobjects::testlocx(int pos) { if(movingobjects[pos].locx>=15)    return true; return false; };