C / C++ / MFC

Michael Dunn wrote:

In general, the higher-up the call stack that you can make a change, the better.

Doing this will stop the dialog from closing by clicking the cancel button or the X button even.

<bold>How will i ever close the dialog then?</bold>

Michael Dunn wrote:

you may perhaps run into weird cases regarding key states, shift states, and so on.

ky_rerun wrote:

Unions are not "type" safe since the same data element can be represented by two different types.

ky_rerun wrote:

Unions are not "type" safe since the same data element can be represented by two different types.

vallikumar wrote:

A union type declaration is a template only. Memory is not reserved until the variable is declared.

struct Fruit
{
     Type m_Type; // Tells us if we're and apple, orange or pear.
     Apple m_Apple;
     Orange m_Orange;
     Pear m_Pear;
};

struct Fruit
{
     Type m_Type; // Tells us if we're and apple, orange or pear.
     union
     {
         Apple m_Apple;
         Orange m_Orange;
         Pear m_Pear;
     } m_Data
};

Stephen Hewitt wrote:

This saving comes at a price - Danger!

Jesus Loves

<marquee direction="up" height="40" scrolldelay="1" step="1" scrollamount="1" style="background:#aabbcc;border-bottom:thin solid 1px #6699cc">
--Owner Drawn
--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord

union Voodoo
{
    int m_Number;
    IUnknown* m_pUnk;
};

Voodoo v;
v.m_Number = 5;
v.m_pUnk->AddRef(); // Danger!!!!!

reinterpret_cast<IUnknown*>(5)->AddRef();

Stephen Hewitt wrote:

union { Apple m_Apple; Orange m_Orange; Pear m_Pear; } m_Data