What is the '\?' Escape Sequence in D?

开发者_运维问答What is the \? string escape sequence in D?

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It's just to escape ?, a literal question mark.

There really is no reason for it to be in D, but it existed in C and C++ in order to avoid the question mark being interpreted as a Trigraph. D doesn't have Trigraphs, so its inclusion must simply be for some added backwards compatibility with C and C++.