OpenFOAM: v1912 released! - For more information see https://www.openfoam.com/releases/openfoam-v1912
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The special operator() for string classes has been removed as being unnecessary since it only duplicated the standard substr method and made the code less clear.
a = b(10);
a = b.substr(10);
The rarely used, special purpose readList<T> function has been removed and replaced with more robust solutions.
The ccm26ToFoam application has now been removed. If you have access to the underlying libraries, the ccmToFoam and foamToCcm provide better solutions.