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common/hex_util: Reserve std::string memory ahead of time
Avoids potentially performing multiple reallocations (depending on the size of the input data) by reserving the necessary amount of memory ahead of time. This is trivially doable, so there's no harm in it.
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@ -36,10 +36,15 @@ std::string HexToString(const ContiguousContainer& data, bool upper = true) {
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static_assert(std::is_same_v<typename ContiguousContainer::value_type, u8>,
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"Underlying type within the contiguous container must be u8.");
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constexpr std::size_t pad_width = 2;
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std::string out;
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out.reserve(std::size(data) * pad_width);
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for (const u8 c : data) {
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out += fmt::format(upper ? "{:02X}" : "{:02x}", c);
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}
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return out;
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}
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