tmp/tmpbtut9l1k/{from.md → to.md}
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#### Element access <a id="span.elem">[[span.elem]]</a>
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``` cpp
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constexpr reference operator[](size_type idx) const;
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```
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*Preconditions:* `idx < size()` is `true`.
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*Effects:* Equivalent to: `return *(data() + idx);`
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``` cpp
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constexpr reference front() const;
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```
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*Preconditions:* `empty()` is `false`.
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*Effects:* Equivalent to: `return *data();`
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``` cpp
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constexpr reference back() const;
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```
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*Preconditions:* `empty()` is `false`.
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*Effects:* Equivalent to: `return *(data() + (size() - 1));`
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``` cpp
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constexpr pointer data() const noexcept;
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```
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*Effects:* Equivalent to: `return data_;`
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