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include/tl/algorithm/count.h

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+#pragma once
+
+#include "tl/detail/prologue.h"
+#include "tl/iterator.h"
+
+#include <algorithm>
+
+namespace tl
+{
+
+//////////////////////////////////////////////////////////////////////////
+
+// count()
+//
+// Container-based version of the <algorithm> `std::count()` function to
+// count values that match within a container
+template <typename C, typename T>
+auto count(const C& c, T&& value) noexcept -> typename std::iterator_traits<typename C::iterator>::difference_type;
+
+// count_if()
+//
+// Container-based version of the <algorithm> `std::count()` function to
+// count values that match within a container
+template <typename C, typename UnaryPredicate>
+auto count_if(const C& c, UnaryPredicate&& p) noexcept -> typename std::iterator_traits<typename C::iterator>::difference_type;
+
+//////////////////////////////////////////////////////////////////////////
+
+} // end namespace tl
+