tmp/tmpjrjtfs26/{from.md → to.md}
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#### `constexpr` functions and constructors <a id="constexpr.functions">[[constexpr.functions]]</a>
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`constexpr`
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#### `constexpr` functions and constructors <a id="constexpr.functions">[[constexpr.functions]]</a>
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This standard explicitly requires that certain standard library
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functions are `constexpr` ([[dcl.constexpr]]). An implementation shall
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not declare any standard library function signature as `constexpr`
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except for those where it is explicitly required. Within any header that
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provides any non-defining declarations of `constexpr` functions or
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constructors an implementation shall provide corresponding definitions.
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