Merge https://github.com/Microsoft/vcpkg

1 files changed, 38 insertions, 0 deletions

diff --git a/toolsrc/include/Span.h b/toolsrc/include/Span.h
new file mode 100644
index 000000000..b16af2cef
--- /dev/null
+++ b/toolsrc/include/Span.h
@@ -0,0 +1,38 @@
+#pragma once

+

+#include <array>

+#include <cstddef>

+#include <vector>

+

+template<class T>

+struct span

+{

+public:

+    using element_type = T;

+    using pointer = T*;

+    using reference = T&;

+    using iterator = T*;

+

+    constexpr span() noexcept : m_ptr(nullptr), m_count(0) {}

+    constexpr span(std::nullptr_t) noexcept : span() {}

+    constexpr span(T* ptr, size_t count) noexcept : m_ptr(ptr), m_count(count) {}

+    constexpr span(T* ptr_begin, T* ptr_end) noexcept : m_ptr(ptr_begin), m_count(ptr_end - ptr_begin) {}

+

+    template<size_t N>

+    constexpr span(T (&arr)[N]) noexcept : span(arr, N)

+    {

+    }

+

+    span(std::vector<T>& v) noexcept : span(v.data(), v.size()) {}

+    span(const std::vector<std::remove_const_t<T>>& v) noexcept : span(v.data(), v.size()) {}

+

+    constexpr iterator begin() const { return m_ptr; }

+    constexpr iterator end() const { return m_ptr + m_count; }

+

+    constexpr reference operator[](size_t i) const { return m_ptr[i]; }

+    constexpr size_t size() const { return m_count; }

+

+private:

+    pointer m_ptr;

+    size_t m_count;

+};