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authorchriseth <chris@ethereum.org>2017-08-25 18:25:05 +0800
committerchriseth <chris@ethereum.org>2017-08-26 01:36:48 +0800
commit6951a371ecb7cdb93bed44b902a04a45f4f8249c (patch)
treefb066b52df07de26acbe710878aa2303fb665e3b /libdevcore
parent6475bd9a72526011b495fae45aa6c8ddb514f611 (diff)
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Cleanup of vector_ref.h
Diffstat (limited to 'libdevcore')
-rw-r--r--libdevcore/vector_ref.h39
1 files changed, 8 insertions, 31 deletions
diff --git a/libdevcore/vector_ref.h b/libdevcore/vector_ref.h
index 0f543181..b4dcff65 100644
--- a/libdevcore/vector_ref.h
+++ b/libdevcore/vector_ref.h
@@ -23,6 +23,8 @@ public:
using value_type = _T;
using element_type = _T;
using mutable_value_type = typename std::conditional<std::is_const<_T>::value, typename std::remove_const<_T>::type, _T>::type;
+ using string_type = typename std::conditional<std::is_const<_T>::value, std::string const, std::string>::type;
+ using vector_type = typename std::conditional<std::is_const<_T>::value, std::vector<typename std::remove_const<_T>::type> const, std::vector<_T>>::type;
static_assert(std::is_pod<value_type>::value, "vector_ref can only be used with PODs due to its low-level treatment of data.");
@@ -30,18 +32,13 @@ public:
/// Creates a new vector_ref to point to @a _count elements starting at @a _data.
vector_ref(_T* _data, size_t _count): m_data(_data), m_count(_count) {}
/// Creates a new vector_ref pointing to the data part of a string (given as pointer).
- vector_ref(typename std::conditional<std::is_const<_T>::value, std::string const*, std::string*>::type _data): m_data(reinterpret_cast<_T*>(_data->data())), m_count(_data->size() / sizeof(_T)) {}
- /// Creates a new vector_ref pointing to the data part of a vector (given as pointer).
- vector_ref(typename std::conditional<std::is_const<_T>::value, std::vector<typename std::remove_const<_T>::type> const*, std::vector<_T>*>::type _data): m_data(_data->data()), m_count(_data->size()) {}
+ vector_ref(string_type* _data): m_data(reinterpret_cast<_T*>(_data->data())), m_count(_data->size() / sizeof(_T)) {}
/// Creates a new vector_ref pointing to the data part of a string (given as reference).
- vector_ref(typename std::conditional<std::is_const<_T>::value, std::string const&, std::string&>::type _data): m_data(reinterpret_cast<_T*>(_data.data())), m_count(_data.size() / sizeof(_T)) {}
-#if DEV_LDB
- vector_ref(ldb::Slice const& _s): m_data(reinterpret_cast<_T*>(_s.data())), m_count(_s.size() / sizeof(_T)) {}
-#endif
+ vector_ref(string_type& _data): vector_ref(&_data) {}
+ /// Creates a new vector_ref pointing to the data part of a vector (given as pointer).
+ vector_ref(vector_type* _data): m_data(_data->data()), m_count(_data->size()) {}
explicit operator bool() const { return m_data && m_count; }
- bool contentsEqual(std::vector<mutable_value_type> const& _c) const { if (!m_data || m_count == 0) return _c.empty(); else return _c.size() == m_count && !memcmp(_c.data(), m_data, m_count * sizeof(_T)); }
- std::vector<mutable_value_type> toVector() const { return std::vector<mutable_value_type>(m_data, m_data + m_count); }
std::vector<unsigned char> toBytes() const { return std::vector<unsigned char>(reinterpret_cast<unsigned char const*>(m_data), reinterpret_cast<unsigned char const*>(m_data) + m_count * sizeof(_T)); }
std::string toString() const { return std::string((char const*)m_data, ((char const*)m_data) + m_count * sizeof(_T)); }
@@ -50,25 +47,14 @@ public:
_T* data() const { return m_data; }
/// @returns the number of elements referenced (not necessarily number of bytes).
- size_t count() const { return m_count; }
- /// @returns the number of elements referenced (not necessarily number of bytes).
size_t size() const { return m_count; }
bool empty() const { return !m_count; }
- /// @returns a new vector_ref pointing at the next chunk of @a size() elements.
- vector_ref<_T> next() const { if (!m_data) return *this; else return vector_ref<_T>(m_data + m_count, m_count); }
/// @returns a new vector_ref which is a shifted and shortened view of the original data.
/// If this goes out of bounds in any way, returns an empty vector_ref.
/// If @a _count is ~size_t(0), extends the view to the end of the data.
vector_ref<_T> cropped(size_t _begin, size_t _count) const { if (m_data && _begin <= m_count && _count <= m_count && _begin + _count <= m_count) return vector_ref<_T>(m_data + _begin, _count == ~size_t(0) ? m_count - _begin : _count); else return vector_ref<_T>(); }
/// @returns a new vector_ref which is a shifted view of the original data (not going beyond it).
vector_ref<_T> cropped(size_t _begin) const { if (m_data && _begin <= m_count) return vector_ref<_T>(m_data + _begin, m_count - _begin); else return vector_ref<_T>(); }
- void retarget(_T* _d, size_t _s) { m_data = _d; m_count = _s; }
- void retarget(std::vector<_T> const& _t) { m_data = _t.data(); m_count = _t.size(); }
- template <class T> bool overlapsWith(vector_ref<T> _t) const { void const* f1 = data(); void const* t1 = data() + size(); void const* f2 = _t.data(); void const* t2 = _t.data() + _t.size(); return f1 < t2 && t1 > f2; }
- /// Copies the contents of this vector_ref to the contents of @a _t, up to the max size of @a _t.
- void copyTo(vector_ref<typename std::remove_const<_T>::type> _t) const { if (overlapsWith(_t)) memmove(_t.data(), m_data, std::min(_t.size(), m_count) * sizeof(_T)); else memcpy(_t.data(), m_data, std::min(_t.size(), m_count) * sizeof(_T)); }
- /// Copies the contents of this vector_ref to the contents of @a _t, and zeros further trailing elements in @a _t.
- void populate(vector_ref<typename std::remove_const<_T>::type> _t) const { copyTo(_t); memset(_t.data() + m_count, 0, std::max(_t.size(), m_count) - m_count); }
_T* begin() { return m_data; }
_T* end() { return m_data + m_count; }
@@ -81,20 +67,11 @@ public:
bool operator==(vector_ref<_T> const& _cmp) const { return m_data == _cmp.m_data && m_count == _cmp.m_count; }
bool operator!=(vector_ref<_T> const& _cmp) const { return !operator==(_cmp); }
-#if DEV_LDB
- operator ldb::Slice() const { return ldb::Slice((char const*)m_data, m_count * sizeof(_T)); }
-#endif
-
void reset() { m_data = nullptr; m_count = 0; }
private:
- _T* m_data;
- size_t m_count;
+ _T* m_data = nullptr;
+ size_t m_count = 0;
};
-template<class _T> vector_ref<_T const> ref(_T const& _t) { return vector_ref<_T const>(&_t, 1); }
-template<class _T> vector_ref<_T> ref(_T& _t) { return vector_ref<_T>(&_t, 1); }
-template<class _T> vector_ref<_T const> ref(std::vector<_T> const& _t) { return vector_ref<_T const>(&_t); }
-template<class _T> vector_ref<_T> ref(std::vector<_T>& _t) { return vector_ref<_T>(&_t); }
-
}