small steps

include/cif++/CifUtils.hpp

@@ -26,6 +26,8 @@
 
 
 #pragma once
 #pragma once
 
 
+#include <charconv>
+#include <cmath>
 #include <filesystem>
 #include <filesystem>
 #include <set>
 #include <set>
 #include <vector>
 #include <vector>
@@ -205,6 +207,129 @@ inline auto coloured(std::basic_string<CharT, Traits, Alloc> &s, StringColour fo
 }
 }
 
 
 // --------------------------------------------------------------------
 // --------------------------------------------------------------------
+
+/// std::from_chars for floating point types.
+template <typename FloatType>
+std::from_chars_result from_chars(const char *first, const char *last, FloatType &value)
+{
+	std::from_chars_result result{first, {}};
+
+	enum State {
+		IntegerSign,
+		Integer,
+		Fraction,
+		ExponentSign,
+		Exponent
+	} state = IntegerSign;
+	int sign = 1;
+	unsigned long long vi = 0;
+	long double f = 1;
+	int exponent_sign = 1;
+	int exponent = 0;
+	bool done = false;
+
+	while (not done and result.ec == std::errc())
+	{
+		char ch = result.ptr != last ? *result.ptr : 0;
+		++result.ptr;
+
+		switch (state)
+		{
+			case IntegerSign:
+				if (ch == '-')
+				{
+					sign = -1;
+					state = Integer;
+				}
+				else if (ch == '+')
+					state = Integer;
+				else if (ch >= '0' and ch <= '9')
+				{
+					vi = ch - '0';
+					state = Integer;
+				}
+				else if (ch == '.')
+					state = Fraction;
+				else
+					result.ec = std::errc::invalid_argument;
+				break;
+			
+			case Integer:
+				if (ch >= '0' and ch <= '9')
+					vi = 10 * vi + (ch - '0');
+				else if (ch == 'e' or ch == 'E')
+					state = ExponentSign;
+				else if (ch == '.')
+					state = Fraction;
+				else
+				{
+					done = true;
+					--result.ptr;
+				}
+				break;
+			
+			case Fraction:
+				if (ch >= '0' and ch <= '9')
+				{
+					vi = 10 * vi + (ch - '0');
+					f /= 10;
+				}
+				else if (ch == 'e' or ch == 'E')
+					state = ExponentSign;
+				else
+				{
+					done = true;
+					--result.ptr;
+				}
+				break;
+
+			case ExponentSign:
+				if (ch == '-')
+				{
+					exponent_sign = -1;
+					state = Exponent;
+				}
+				else if (ch == '+')
+					state = Exponent;
+				else if (ch >= '0' and ch <= '9')
+				{
+					exponent = ch - '0';
+					state = Exponent;
+				}
+				else
+					result.ec = std::errc::invalid_argument;
+				break;
+			
+			case Exponent:
+				if (ch >= '0' and ch <= '9')
+					exponent = 10 * exponent + (ch - '0');
+				else
+				{
+					done = true;
+					--result.ptr;
+				}
+				break;
+		}
+	}
+
+	if (result.ec == std::errc())
+	{
+		long double v = f * vi * sign;
+		if (exponent != 0)
+			v *= std::pow(10, exponent * exponent_sign);
+
+		if (std::isnan(v))
+			result.ec = std::errc::invalid_argument;
+		else if (std::abs(v) > std::numeric_limits<FloatType>::max())
+			result.ec = std::errc::result_out_of_range;
+
+		value = static_cast<FloatType>(v);
+	}
+
+	return result;
+}
+
+// --------------------------------------------------------------------
 //	A progress bar
 //	A progress bar
 
 
 class Progress
 class Progress

include/cif++/v2/category.hpp

@@ -26,6 +26,7 @@
 
 
 #pragma once
 #pragma once
 
 
+#include "iterator.hpp"
 #include "row.hpp"
 #include "row.hpp"
 #include "validate.hpp"
 #include "validate.hpp"
 
 
@@ -46,8 +47,17 @@ class category_t
 		return m_allocator;
 		return m_allocator;
 	}
 	}
 
 
-	struct iterator {};
+	template <typename>
+	friend class row_handle;
 
 
+	template <typename, typename...>
+	friend class iterator_impl;
+
+	using value_type = row_handle<category_t>;
+	using reference = value_type;
+	using const_reference = const value_type;
+	using iterator = iterator_impl<category_t>;
+	using const_iterator = iterator_impl<const category_t>;
 
 
 	category_t() = default;
 	category_t() = default;
 
 
@@ -101,6 +111,56 @@ class category_t
 
 
 	const std::string &name() const { return m_name; }
 	const std::string &name() const { return m_name; }
 
 
+	reference front()
+	{
+		return {*this, *m_head};
+	}
+
+	const_reference front() const
+	{
+		return {*this, *m_head};
+	}
+
+	reference back()
+	{
+		return {*this, *m_tail};
+	}
+
+	const_reference back() const
+	{
+		return {*this, *m_tail};
+	}
+
+	iterator begin()
+	{
+		return {*this, m_head};
+	}
+
+	iterator end()
+	{
+		return {*this, nullptr};
+	}
+
+	const_iterator begin() const
+	{
+		return {*this, m_head};
+	}
+
+	const_iterator end() const
+	{
+		return {*this, nullptr};
+	}
+
+	const_iterator cbegin() const
+	{
+		return {*this, m_head};
+	}
+
+	const_iterator cend() const
+	{
+		return {*this, nullptr};
+	}
+
 	iterator emplace(std::initializer_list<item> items)
 	iterator emplace(std::initializer_list<item> items)
 	{
 	{
 		return this->emplace(items.begin(), items.end());
 		return this->emplace(items.begin(), items.end());
@@ -157,49 +217,33 @@ class category_t
 		// 	}
 		// 	}
 		// }
 		// }
 
 
-		auto r = create_row();
-
-		if (m_head == nullptr)
-			m_head = m_tail = r;
-		else
-			m_tail = m_tail->m_next = r;
+		row *r = this->create_row();
 
 
-		for (auto i = b; i != e; ++i)
+		try
 		{
 		{
-			std::unique_ptr<item_value> new_item(this->create_item(*i));
+			for (auto i = b; i != e; ++i)
+			{
+				item_value *new_item = this->create_item(*i);
 
 
-			if (r->m_head == nullptr)
-				r->m_head = r->m_tail = new_item.release();
-			else
-				r->m_tail = r->m_tail->m_next = new_item.release();
+				if (r->m_head == nullptr)
+					r->m_head = r->m_tail = new_item;
+				else
+					r->m_tail = r->m_tail->m_next = new_item;
+			}
+		}
+		catch (...)
+		{
+			if (r != nullptr)
+				this->delete_row(r);
+			throw;
 		}
 		}
 
 
+		if (m_head == nullptr)
+			m_head = m_tail = r;
+		else
+			m_tail = m_tail->m_next = r;
 
 
-		return {};
-
-
-		// return iterator{ create_row() };
-
-		// Row r(nr);
-
-		// for (auto v = b; v != e; ++v)
-		// 	r.assign(*v, true);
-
-		// // if (isOrphan(r))
-		// // 	throw std::runtime_error("Cannot insert row in category " + mName + " since it would be an orphan");
-
-		// if (mHead == nullptr)
-		// {
-		// 	assert(mTail == nullptr);
-		// 	mHead = mTail = nr;
-		// }
-		// else
-		// {
-		// 	assert(mTail != nullptr);
-		// 	assert(mHead != nullptr);
-		// 	mTail->mNext = nr;
-		// 	mTail = nr;
-		// }
+		return { *this, r };
 
 
 		// result = r;
 		// result = r;
 
 
@@ -207,11 +251,6 @@ class category_t
 		// 	mIndex->insert(nr);
 		// 	mIndex->insert(nr);
 	}
 	}
 
 
-	// void emplace(std::initializer_list<item> items)
-	// {
-	// 	this->emplace_back(value_type{items, this->get_allocator()});
-	// }
-
 	// --------------------------------------------------------------------
 	// --------------------------------------------------------------------
 	/// \brief Return the index number for \a column_name
 	/// \brief Return the index number for \a column_name
 
 
@@ -258,9 +297,7 @@ class category_t
 		return result;
 		return result;
 	}
 	}
 
 
-
   private:
   private:
-
 	// --------------------------------------------------------------------
 	// --------------------------------------------------------------------
 	// Internal storage, strictly forward linked list with minimal space
 	// Internal storage, strictly forward linked list with minimal space
 	// requirements. Strings of size 7 or shorter are stored internally.
 	// requirements. Strings of size 7 or shorter are stored internally.
@@ -271,6 +308,7 @@ class category_t
 	{
 	{
 		item_value(uint16_t column_ix, uint16_t length)
 		item_value(uint16_t column_ix, uint16_t length)
 			: m_next(nullptr)
 			: m_next(nullptr)
+			, m_column_ix(column_ix)
 			, m_length(length)
 			, m_length(length)
 		{
 		{
 		}
 		}
@@ -292,9 +330,9 @@ class category_t
 
 
 		std::string_view text() const
 		std::string_view text() const
 		{
 		{
-			return { m_length >= kBufferSize ? m_data : m_local_data, m_length };
+			return {m_length >= kBufferSize ? m_data : m_local_data, m_length};
 		}
 		}
-		
+
 		const char *c_str() const
 		const char *c_str() const
 		{
 		{
 			return m_length >= kBufferSize ? m_data : m_local_data;
 			return m_length >= kBufferSize ? m_data : m_local_data;
@@ -342,7 +380,7 @@ class category_t
 
 
 	item_value *create_item(const item &i)
 	item_value *create_item(const item &i)
 	{
 	{
-		uint16_t ix = get_column_ix(i.name());
+		uint16_t ix = add_column(i.name());
 		return create_item(ix, i.value());
 		return create_item(ix, i.value());
 	}
 	}
 
 
@@ -422,20 +460,18 @@ class category_t
 		row_allocator_traits::deallocate(ra, r, 1);
 		row_allocator_traits::deallocate(ra, r, 1);
 	}
 	}
 
 
-
 	struct item_column
 	struct item_column
 	{
 	{
 		std::string m_name;
 		std::string m_name;
-		ValidateItem *m_validator;
+		const ValidateItem *m_validator;
 
 
-		item_column(std::string_view name, ValidateItem *validator)
+		item_column(std::string_view name, const ValidateItem *validator)
 			: m_name(name)
 			: m_name(name)
 			, m_validator(validator)
 			, m_validator(validator)
 		{
 		{
 		}
 		}
 	};
 	};
 
 
-
 	allocator_type m_allocator;
 	allocator_type m_allocator;
 	std::string m_name;
 	std::string m_name;
 	std::vector<item_column, typename std::allocator_traits<allocator_type>::template rebind_alloc<item_column>> m_columns;
 	std::vector<item_column, typename std::allocator_traits<allocator_type>::template rebind_alloc<item_column>> m_columns;

include/cif++/v2/iterator.hpp

+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 NKI/AVL, Netherlands Cancer Institute
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "row.hpp"
+
+namespace cif::v2
+{
+
+// --------------------------------------------------------------------
+
+template <typename CategoryType, typename... Ts>
+class iterator_impl
+{
+  public:
+	template <typename, typename...>
+	friend class iterator_impl;
+
+	static constexpr size_t N = sizeof...(Ts);
+
+	using category_type = CategoryType;
+	using row_type = typename category_type::row;
+
+	// using row_type = std::conditional_t<std::is_const_v<category_type>, const category_type::row, category_type::row>;
+	// using row_impl_type = std::conditional_t<std::is_const_v<category_type>, typename const category_type::row, typename category_type::row>;
+
+	using iterator_category = std::forward_iterator_tag;
+	using value_type = std::conditional_t<N == 0, row_handle<category_type>, std::tuple<Ts...>>;
+	using difference_type = std::ptrdiff_t;
+	using pointer = value_type *;
+	using reference = std::conditional_t<N == 0, row_handle<category_type>, value_type>;
+
+	friend class Category;
+
+	// // default constructor, equal to end()
+	// iterator_impl() {}
+
+	iterator_impl(const iterator_impl &rhs)
+		: m_category(rhs.m_category)
+		, m_current(rhs.m_current)
+		, m_value(rhs.m_value)
+		, m_column_ix(rhs.m_column_ix)
+	{
+	}
+
+	iterator_impl(category_type &cat, row_type *current)
+		: m_category(&cat)
+		, m_current(current)
+		, m_value(cat, *current)
+	{
+		static_assert(N == 0, "Only valid if this is a row iterator, not a row<xxx> iterator");
+	}
+
+	// iterator_impl(ItemRow *data)
+	// 	: m_current(data)
+	// {
+	// 	static_assert(N == 0, "Only valid if this is a row iterator, not a row<xxx> iterator");
+	// }
+
+	// iterator_impl(ItemRow *data, const std::array<size_t, N> &cix)
+	// 	: m_current(data)
+	// 	, m_column_ix(cix)
+	// {
+	// }
+
+	template <typename IRowType>
+	iterator_impl(iterator_impl<IRowType, Ts...> &rhs)
+		: m_category(rhs.m_category)
+		, m_current(rhs.m_current)
+		, m_column_ix(rhs.m_column_ix)
+	{
+		if constexpr (N > 0)
+			m_value = get(m_current, std::make_index_sequence<N>());
+	}
+
+	template <typename IRowType>
+	iterator_impl(const iterator_impl<IRowType> &rhs, const std::array<size_t, N> &cix)
+		: m_category(rhs.m_category)
+		, m_current(rhs.m_current)
+		, m_column_ix(cix)
+	{
+		if constexpr (N > 0)
+			m_value = get(m_current, std::make_index_sequence<N>());
+	}
+
+	iterator_impl &operator=(const iterator_impl &i)
+	{
+		m_category = i.m_category;
+		m_current = i.m_current;
+		if constexpr (N != 0)
+		{
+			m_column_ix = i.m_column_ix;
+			m_value = i.m_value;
+		}
+		return *this;
+	}
+
+	virtual ~iterator_impl() = default;
+
+	reference operator*()
+	{
+		if constexpr (N == 0)
+			return { *m_category, *m_current };
+		else
+			return m_value;
+	}
+
+	pointer operator->()
+	{
+		if constexpr (N == 0)
+			return &m_current;
+		else
+			return &m_value;
+	}
+
+	row_type row() const
+	{
+		return m_current;
+	}
+
+	iterator_impl &operator++()
+	{
+		if (m_current != nullptr)
+			m_current = m_current->m_next;
+
+		if constexpr (N != 0)
+			m_value = get(m_current, std::make_index_sequence<N>());
+
+		return *this;
+	}
+
+	iterator_impl operator++(int)
+	{
+		iterator_impl result(*this);
+		this->operator++();
+		return result;
+	}
+
+	bool operator==(const iterator_impl &rhs) const { return m_current == rhs.m_current; }
+	bool operator!=(const iterator_impl &rhs) const { return m_current != rhs.m_current; }
+
+	template <typename IRowType, typename... ITs>
+	bool operator==(const iterator_impl<IRowType, ITs...> &rhs) const
+	{
+		return m_current == rhs.m_current;
+	}
+
+	template <typename IRowType, typename... ITs>
+	bool operator!=(const iterator_impl<IRowType, ITs...> &rhs) const
+	{
+		return m_current != rhs.m_current;
+	}
+
+  private:
+	template <std::size_t... Is>
+	std::tuple<Ts...> get(row_type row, std::index_sequence<Is...>) const
+	{
+		if (row)
+			return std::tuple<Ts...>{row[m_column_ix[Is]].template as<Ts>()...};
+		return {};
+	}
+
+	category_type *m_category;
+	row_type *m_current;
+	value_type m_value;
+	std::array<size_t, N> m_column_ix;
+};
+
+
+} // namespace cif::v2
\ No newline at end of file

include/cif++/v2/list.hpp

+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 NKI/AVL, Netherlands Cancer Institute
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <memory>
+
+namespace cif::v2
+{
+
+// --------------------------------------------------------------------
+
+template<typename Allocator = std::allocator<void>>
+class list
+{
+  public:
+
+
+
+  protected:
+
+	struct list_item
+	{
+		list_item *m_next = nullptr;
+	};
+
+	using list_item_allocator_type = typename std::allocator_traits<Alloc>::template rebind_alloc<list_item>;
+	using list_item_allocator_traits = std::allocator_traits<item_allocator_type>;
+
+	list_item_allocator_traits::pointer get_item()
+	{
+		list_item_allocator_type ia(get_allocator());
+		return list_item_allocator_traits::allocate(ia, 1);
+	}
+
+	template<typename ...Arguments>
+	list_item *create_list_item(uint16_t column_ix, Arguments... args)
+	{
+		auto p = this->get_item();
+		list_item_allocator_type ia(get_allocator());
+		list_item_allocator_traits::construct(ia, p, std::forward<Arguments>(args)...);
+		return p;
+	}
+
+	void delete_list_item(list_item *iv)
+	{
+		list_item_allocator_type ia(get_allocator());
+		list_item_allocator_traits::destroy(ia, iv);
+		list_item_allocator_traits::deallocate(ia, iv, 1);
+	}
+
+	list_item *m_head = nullptr, *m_tail = nullptr;
+};
+
+
+} // namespace cif::v2

include/cif++/v2/row.hpp

@@ -40,29 +40,31 @@ class row_handle
   public:
   public:
 
 
 	using category_type = Category;
 	using category_type = Category;
+	using row_type = category_type::row;
 
 
-	row_handle(Category &cat)
-		: m_cat(cat) {}
+	row_handle(category_type &cat, row_type &row)
+		: m_cat(cat)
+		, m_row(row) {}
 
 
-	// item_handle<row_t> operator[](uint32_t column_ix)
-	// {
-	// 	return item_handle<row_t>(column_ix, *this);
-	// }
+	item_handle<row_type> operator[](uint32_t column_ix)
+	{
+		return item_handle<row_type>(column_ix, m_row);
+	}
 
 
-	// const item_handle<const row_t> operator[](uint32_t column_ix) const
-	// {
-	// 	return item_handle<const row_t>(column_ix, *this);
-	// }
+	const item_handle<const row_type> operator[](uint32_t column_ix) const
+	{
+		return item_handle<const row_type>(column_ix, m_row);
+	}
 
 
-	// item_handle<row_t> operator[](std::string_view column_name)
-	// {
-	// 	return item_handle<row_t>(column_name, get_column_ix(column_name), *this);
-	// }
+	item_handle<row_type> operator[](std::string_view column_name)
+	{
+		return item_handle<row_type>(get_column_ix(column_name), m_row);
+	}
 
 
-	// const item_handle<const row_t> operator[](std::string_view column_name) const
-	// {
-	// 	return item_handle<const row_t>(column_name, get_column_ix(column_name), *this);
-	// }
+	const item_handle<const row_type> operator[](std::string_view column_name) const
+	{
+		return item_handle<const row_type>(get_column_ix(column_name), m_row);
+	}
 
 
 
 
 
 
@@ -76,6 +78,7 @@ class row_handle
 
 
 
 
 	category_type &m_cat;
 	category_type &m_cat;
+	row_type &m_row;
 };
 };
 
 
 
 

test/unit-v2-test.cpp

@@ -76,6 +76,38 @@ bool init_unit_test()
 
 
 // --------------------------------------------------------------------
 // --------------------------------------------------------------------
 
 
+BOOST_AUTO_TEST_CASE(cc_1)
+{
+	std::tuple<std::string_view,float,char> tests[] = {
+		{ "1.0", 1.0, 0 },
+		{ "1.0e10", 1.0e10, 0 },
+		{ "-1.1e10", -1.1e10, 0 },
+		{ "-.2e11", -.2e11, 0 },
+		{ "1.3e-10", 1.3e-10, 0 },
+
+		{ "1.0 ", 1.0, ' ' },
+		{ "1.0e10 ", 1.0e10, ' ' },
+		{ "-1.1e10 ", -1.1e10, ' ' },
+		{ "-.2e11 ", -.2e11, ' ' },
+		{ "1.3e-10 ", 1.3e-10, ' ' },
+		
+	};
+
+	for (const auto &[txt, val, ch] : tests)
+	{
+		float tv;
+		const auto &[ptr, ec] = cif::from_chars(txt.begin(), txt.end(), tv);
+
+		BOOST_CHECK(ec == std::errc());
+		BOOST_CHECK_EQUAL(tv, val);
+		if (ch != 0)
+			BOOST_CHECK_EQUAL(*ptr, ch);
+	}
+
+}
+
+// --------------------------------------------------------------------
+
 BOOST_AUTO_TEST_CASE(r_1)
 BOOST_AUTO_TEST_CASE(r_1)
 {
 {
 	cif::v2::category c("foo");
 	cif::v2::category c("foo");
@@ -86,9 +118,9 @@ BOOST_AUTO_TEST_CASE(r_1)
 	});
 	});
 
 
 	auto row = c.front();
 	auto row = c.front();
-	BOOST_CHECK_EQUAL(row["f-1"].compare(1), 0;)
-	BOOST_CHECK_EQUAL(row["f-2"].compare(1), "two";)
-	BOOST_CHECK_EQUAL(row["f-3"].compare(1), 3.0;)
+	BOOST_CHECK_EQUAL(row["f-1"].compare(1), 0);
+	BOOST_CHECK_EQUAL(row["f-2"].compare("two"), 0);
+	BOOST_CHECK_EQUAL(row["f-3"].compare(3.0), 0);
 }
 }
 
 
 
 
@@ -106,6 +138,26 @@ BOOST_AUTO_TEST_CASE(r_2)
 
 
 }
 }
 
 
+BOOST_AUTO_TEST_CASE(c_1)
+{
+	cif::v2::category c("foo");
+
+	c.emplace({ { "id", 1 }, { "s", "aap" } });
+	c.emplace({ { "id", 2 }, { "s", "noot" } });
+	c.emplace({ { "id", 3 }, { "s", "mies" } });
+
+	int n = 1;
+
+	const char *ts[] = { "aap", "noot", "mies" };
+
+	for (auto r : c)
+	{
+		BOOST_CHECK_EQUAL(r["id"].as<int>(), n);
+		BOOST_CHECK_EQUAL(r["s"].compare(ts[n - 1]), 0);
+		++n;
+	}
+}
+
 // --------------------------------------------------------------------
 // --------------------------------------------------------------------
 
 
 // BOOST_AUTO_TEST_CASE(f_1)
 // BOOST_AUTO_TEST_CASE(f_1)