21 Language support library [language.support]

21.9 Initializer lists [support.initlist]

21.9.3 Initializer list access [support.initlist.access]

constexpr const E* begin() const noexcept;

1
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Returns: A pointer to the beginning of the array. If size() == 0 the values of begin() and end() are unspecified but they shall be identical.

constexpr const E* end() const noexcept;

2
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Returns: begin() + size().

constexpr size_t size() const noexcept;

3
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Returns: The number of elements in the array.

4
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Complexity: Constant time.