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Change type of hash to guaranteed 64 bit integer

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Fixes #66, closes #69 (obsolete now).
This commit is contained in:
Jonathan Müller 2018-12-18 17:04:06 +01:00
commit 3cd14ca0f5
1 changed files with 8 additions and 6 deletions
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14
include/cppast/cpp_entity_index.hpp
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@ -5,6 +5,7 @@
#ifndef CPPAST_CPP_ENTITY_INDEX_HPP_INCLUDED
#define CPPAST_CPP_ENTITY_INDEX_HPP_INCLUDED
#include <cstdint>
#include <mutex>
#include <string>
#include <unordered_map>
@ -23,20 +24,21 @@ class cpp_namespace;
/// \exclude
namespace detail
{
constexpr std::size_t fnv_basis = 14695981039346656037ull;
constexpr std::size_t fnv_prime = 1099511628211ull;
using hash_type = std::uint_least64_t;
constexpr hash_type fnv_basis = 14695981039346656037ull;
constexpr hash_type fnv_prime = 1099511628211ull;
// FNV-1a 64 bit hash
constexpr std::size_t id_hash(const char* str, std::size_t hash = fnv_basis)
constexpr hash_type id_hash(const char* str, hash_type hash = fnv_basis)
{
return *str ? id_hash(str + 1, (hash ^ std::size_t(*str)) * fnv_prime) : hash;
return *str ? id_hash(str + 1, (hash ^ hash_type(*str)) * fnv_prime) : hash;
}
} // namespace detail
/// A [ts::strong_typedef]() representing the unique id of a [cppast::cpp_entity]().
///
/// It is comparable for equality.
struct cpp_entity_id : type_safe::strong_typedef<cpp_entity_id, std::size_t>,
struct cpp_entity_id : type_safe::strong_typedef<cpp_entity_id, detail::hash_type>,
type_safe::strong_typedef_op::equality_comparison<cpp_entity_id>
{
explicit cpp_entity_id(const std::string& str) : cpp_entity_id(str.c_str()) {}
@ -118,7 +120,7 @@ private:
{
std::size_t operator()(const cpp_entity_id& id) const noexcept
{
return static_cast<std::size_t>(id);
return std::size_t(static_cast<detail::hash_type>(id));
}
};