input - C++ using a member function from from one class in the main function? -

i have main , im setting input im using getters/setters use method inputhander main doing causing stack overflow there infinite loop going on.

the warning get:

warning c4717: 'key_callback' : recursive on control paths, function cause runtime stack overflow 

i have no other idea how call method other use getter , setter

main.cpp

#include <glfw3.h> #include <stdio.h> #include <iostream>  #include "inputhandler.h"  using namespace std;  /* begin void prototyping */ void error_callback(int error, const char* description); void key_callback(glfwwindow* window, int key, int scancode, int action, int mods);  int main(void) {     glfwwindow* window;      /* initializes error call-backs */     glfwseterrorcallback(error_callback);      /* initialize library */     if (!glfwinit())         return -1;      /* create windowed mode window , opengl context */     window = glfwcreatewindow(640, 480, "hello world", null, null); // fullscreen glfwgetprimarymonitor() (first null)     if (!window)     {         glfwterminate();         return -1;     }      /* makes opengl context current */     glfwmakecontextcurrent(window);      /* make window's context current */     glfwmakecontextcurrent(window);      /* receives input events */     glfwsetkeycallback(window, key_callback);      /* loop until user closes window */     while (!glfwwindowshouldclose(window))     {         /* render here */         float ratio;         int width, height;          glfwgetframebuffersize(window, &width, &height);         ratio = width / (float) height;          glviewport(0, 0, width, height);         glclear(gl_color_buffer_bit | gl_depth_buffer_bit);         glenable(gl_depth_test);         gldepthfunc(gl_lequal);          glmatrixmode(gl_projection);         glloadidentity();         glortho(-ratio, ratio, -1.f, 1.f, 1.f, -1.f);         glmatrixmode(gl_modelview);          glloadidentity();         glrotatef((float) glfwgettime() * 10.f, 0.f, 10.f, 0.f);          /* swap front , buffers */         glfwswapbuffers(window);           /* poll , process events */         glfwpollevents();     }      glfwdestroywindow(window);      glfwterminate();     return 0; }  /* calls program if glfw function fail , logs */ void error_callback(int error, const char* description) {     fputs(description, stderr); }  /*     gets inputhandler::key_callback returns key_callback use in main.cpp */ void key_callback(glfwwindow* window, int key, int scancode, int action, int mods) {     return key_callback(window, key, scancode, action, mods); } 

inputhandler.h

#pragma once  #include <glfw3.h> #include <iostream>  using namespace std;  class inputhandler { public:     inputhandler(void);     ~inputhandler(void);      static void key_callback(glfwwindow* window, int key, int scancode, int action, int mods); }; 

inputhandler.cpp

#include "inputhandler.h"  glfwwindow* window;  inputhandler::inputhandler(void) { }   inputhandler::~inputhandler(void) { }  /* gives keys events */ static void key_callback(glfwwindow* window, int key, int scancode, int action, int mods) {     switch(key)     {     case glfw_key_escape:         glfwsetwindowshouldclose(window, gl_true);         break;     case glfw_key_w:         cout << "w working" << endl;         break;     case glfw_key_a:         break;     case glfw_key_s:         break;     case glfw_key_d:         break;     case glfw_key_1:         break;     case glfw_key_2:         break;     } } 

as error message says, function:

void key_callback(glfwwindow* window, int key, int scancode, int action, int mods) {     return key_callback(window, key, scancode, action, mods); } 

calls itself, entering recursive death spiral. presumably, meant

return inputhandler::key_callback(window, key, scancode, action, mods); 

more simply, remove non-member function , set real callback directly:

glfwsetkeycallback(window, &inputhandler::key_callback); 

you'll need fix definition of static member:

/*no static here*/  void inputhandler::key_callback(glfwwindow* window, int key, int scancode, int action, int mods)  {//  ^^^^^^^^^^^^^^      // whatever }