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ircd: Add $() hash convenience; comments on ircd::crh.

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This commit is contained in:
Jason Volk 2017-10-04 16:23:51 -07:00
parent 87771b00ba
commit b7f1f04412
1 changed files with 20 additions and 0 deletions
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20
include/ircd/hash.h
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@ -27,14 +27,30 @@
namespace ircd
{
// constexpr bernstein string hasher suite; these functions will hash the
// string at compile time leaving an integer residue at runtime.
constexpr size_t hash(const char *const &str, const size_t i = 0);
constexpr size_t hash(const char16_t *const &str, const size_t i = 0);
// Note that at runtime this hash uses multiplication on every character
// which can consume many cycles...
size_t hash(const std::string &str, const size_t i = 0);
size_t hash(const std::u16string &str, const size_t i = 0);
size_t hash(const std::string_view &str, const size_t i = 0);
/// ircd reserves the $ character (in our namespace of course) as an alias
/// for hashing string literals at compile time.
template<class string>
constexpr size_t $(string&& s)
{
return hash(std::forward<string>(s));
}
}
/// Collision-Resistant Hashing
///
/// ircd::crh contains support for collision-resistant hash functions including
/// cryptographic hash functions.
namespace ircd::crh
{
IRCD_EXCEPTION(ircd::error, error)
@ -43,12 +59,16 @@ namespace ircd::crh
struct sha256;
}
// Export aliases down to ircd::
namespace ircd
{
using crh::hash;
using crh::sha256;
}
/// Abstract interface to a hashing context for any algorithm in ircd::crh
///
/// Use this type when dealing with algorithm-agnostic hashing.
struct ircd::crh::hash
{
virtual size_t length() const = 0;