Why is C++’s NULL typically an integer literal rather than a pointer like in C?

In C, a void* can be implicitly converted to any T*. As such, making NULL a void* is entirely appropriate. But that’s profoundly dangerous. So C++ did away with such conversions, requiring you to do most pointer casts manually. But that would create source-incompatibility with C; a valid C program that used NULL the way … Read more

Instantiating a python class in C#

IronPython classes are not .NET classes. They are instances of IronPython.Runtime.Types.PythonType which is the Python metaclass. This is because Python classes are dynamic and support addition and removal of methods at runtime, things you cannot do with .NET classes. To use Python classes in C# you will need to use the ObjectOperations class. This class … Read more

“if” statement syntax differences between C and C++

This is a subtle and important difference between C and C++. In C++ any statement may be a declaration-statement. In C, there is no such thing as a declaration-statement; instead, a declaration can appear instead of a statement within any compound-statement. From the C grammar (C17 spec): compound-statement: “{” block-item-listopt “}” block-item-list: block-item | block-item-list … Read more

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