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Thank you very much

Dear friends:
I downloaded the C++ Mathematical Expression Library from the web, and i uploaded it in the attachment.
It consists of only one head file. But the compiling process is very slow...

Dear friends:
I am confused about the problem of "using reference as class member". For example, i have two classes.


class A
{
public:
A(Mesh& FM):FVmesh(FM){}
private:
Mesh&...

Dear friends:
I am writing a program about iteration method.
i want to write a result file after each iteration, and name the file with the iteration number. dat.
how should i do to...

thank you very much for your reply. but my software have many variable to share between different subfunction. for example, the coordinates of each grid points will be used in every subfunctinos....

Dear frineds:
thank you very much for your reply. you mean i need two head file. one wihout "external" added, and on with "external" added.?

Thank you for you reply, dear friends.
but if i use the include guide in the file, some sub function may not know the global variable defined in the header file.
What should i do.

Dear friends:
I am writing a compuational fluid dynamics code with c++, and the procedure have many sub-functions to compute different quantities.
I want to defined a head file name as...