Curiosity about RECT initialization... Not really a problem...

Question

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So I have a WindowSize RECT declared as a private variable in my WinClass, class. I tried to use block initialization in the constructor, but alas, it made me initialize each member separately so my question is why doesn't this work?

C++

WindowSize = { 0, 0, 300, 300 };

This works:

C++

RECT WindowSize = {0,0,300,300};

Like I said in the title it is more of a curiosity for me, so if you have the time and patience to explain it to me, allow me to say thanks in advance -- Steve.
WinClass.h

C++

private:
	RECT WindowSize;

WinClass.cpp

C++

WinClass::WinClass(HINSTANCE hInstance){
	WindowSize = { 0, 0, 800, 600 };...}

Errors:

C++

error C2059: syntax error : '{'
error C2143: syntax error : missing ';' before '{'
error C2143: syntax error : missing ';' before '}'

Posted 9-Dec-15 8:44am

drkwlf

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Richard MacCutchan · Accepted Answer · 2015-12-09T09:32:00

This code declares a new variable with some initial values at compile time, and that is fine, the compiler creates the variable from scratch.

C++

RECT WindowSize = {0,0,300,300};

This code

C++

WindowSize = { 0, 0, 300, 300 };

tries to assign multiple values to an existing variable, at run time, which is not allowed. At run time you must assign each member of the class or structure individually.