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util: move HasPrefix() so it can be reused

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Move the function `HasPrefix()` from `netaddress.cpp` to `util/string.h`
so it can be reused by `CNetAddr` methods (and possibly others).
This commit is contained in:
Vasil Dimov 2020-08-31 10:39:00 +02:00
parent a47e596486
commit d2bb681f96
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2 changed files with 15 additions and 8 deletions
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13
src/util/string.h
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@ -7,6 +7,8 @@
#include <attributes.h>
#include <algorithm>
#include <array>
#include <cstring>
#include <locale>
#include <sstream>
@ -74,4 +76,15 @@ std::string ToString(const T& t)
return oss.str();
}
/**
* Check whether a container begins with the given prefix.
*/
template <typename T1, size_t PREFIX_LEN>
NODISCARD inline bool HasPrefix(const T1& obj,
const std::array<uint8_t, PREFIX_LEN>& prefix)
{
return obj.size() >= PREFIX_LEN &&
std::equal(std::begin(prefix), std::end(prefix), std::begin(obj));
}
#endif // BITCOIN_UTIL_STRENCODINGS_H