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Is it legal to do the following in C++:

const T array[3]{ **some expression**, **another expression**, T{ 1 } - array[0] - array[1] };

In other words: will the 3rd element always be initialized to 1 - **some expression** - **another expression**?

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initializer list uses left to right evaluation, but it is evaluated before the initialization of array.

will the 3rd element always be initialized to 1 - some expression - another expression?

No, and you have even UB with T{ 1 } - array[0] - array[1].

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