Tomas Bym schrieb:
> Hello, is there any way in FLTK or simply C++, how to get a pointer
> to some main class from in any place of the code.
Simply C++ is to use a static pointer or class - everywhere you include
the static pointer/class it will be the same. A simple example:
Include file "s_data.h":
---------------------------------------------------
#ifndef s_data_h
#define s_data_h
struct data {
int D1;
int D2;
data(): D1(0), D2(0) {}
};
class static_data
{
public:
static data* Get_Data() { return smp_Data; }
static void Set_Data(data* D) { smp_Data= D; }
private:
static data* smp_Data;
};
#endif
---------------------------------------------------
usage for data class:
---------------------------------------------------
#include "s_data.h"
Class_With_Data_Member::Class_With_Data_Member()
{ // Set global data struct:
static_data::Set_Data(&Member_Data);
}
data* static_data::smp_Data= 0;
// Definition of static member!
// Usually inside "s_data.cpp"
---------------------------------------------------
Usage for other classes:
---------------------------------------------------
#include "s_data.h"
void some_class::Foo()
{
if (data* ptr_Data= static_data::Get_Data())
{ // Test for existing data
if (ptr_Data->D1== 1) Do_Something();
// using data
}
}
---------------------------------------------------
This is just written down, but should be good enough to show the
principle. To find more sophisticated examples you should look for
design pattern "singleton".
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