What\'s the Correct Way to Delegate Constructors in C ?

Delegating Constructors

Delegating a constructor involves calling another constructor from within the constructor body to avoid redundant code execution.

Correct Approach

The second code block presented is the correct implementation for constructor delegation in C . It uses the constructor's initialization list:

Bitmap::Bitmap(WORD ResourceID) : Bitmap((HBITMAP)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(ResourceID), IMAGE_BITMAP, 0, 0, LR_SHARED))
{
}

Initialization List

The initialization list allows you to directly initialize an object upon construction. By passing the HBITMAP value to the Bitmap(HBITMAP) constructor in the initialization list, you delegate the construction to the other constructor.

Incorrect Approach

The first code block attempts to delegate using:

Bitmap(BMP);

However, this creates a temporary Bitmap object and does not delegate to the existing constructor.

Delegation Scope

Note that constructor delegation can only occur in the constructor's initialization list and not within the constructor body. Using it within the body would lead to recursive construction, which is not allowed in C .

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