VS Arduino - Variable length array

Nov 7^th, 2025 at 3:51pm (UTC)

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Variable length array (Read 2186 times)

chris52 Junior Member Offline Posts: 47 Joined: Jan 9^th, 2017	Variable length array Feb 15^th, 2017 at 7:20pm	Print Post
	Arduino allows variable length arrays as local variables in functions: Code (C++) void readstring(char* buf, byte maxlen) { char buffer[maxlen+1]; ..... ..... This compiles and runs Ok in both the Arduino IDE (1.8) and in VisualMicro but in the latter it's giving an 'red underline' error for the declaration of 'buffer': 'expression must have a constant value'. A minor bug, perhaps, but potentially a bit confusing to users.


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Tim@Visual Micro Administrator Offline Posts: 12201 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Variable length array Reply #1 - Feb 15^th, 2017 at 8:21pm	Print Post
	Hi, The vs intellisense isn't perfect for gcc. Microsoft are making huge strides in this area so it should improve sometime soon. You can remove the red lines by addding a dummy.h file to the project which does not have to be #included in any code. You simply need to define a slightly different method signature surrounded by #if _MSC_VER. This gives you the ability to change things so that vs is happy without altering the build. http://www.visualmicro.com/page/Extending-Visual-Studio-Intellisense.aspx
	« Last Edit: Feb 15^th, 2017 at 8:22pm by Tim@Visual Micro »

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