Initial commit

Lts/Common/LtsUtils/LtsUtilsCore/pgarray.h

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+/**
+  * Helper class for a vector of integer (stored as integer[] in the postgres database
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Ehrlicher, SLSE, 2016-05-03
+  */
+
+#pragma once
+#include <QString>
+#include <map>
+#include <vector>
+#include <cstdint>
+
+namespace LtsUtils
+{
+
+template<typename T, typename C>
+class PgArray
+{
+public:
+  using Type =  T;
+  using ContainerType = C;
+
+  PgArray() = default;
+  Q_DECL_CONSTEXPR explicit PgArray(const C &data)
+    : m_data(data)
+  {}
+
+  Q_DECL_CONSTEXPR C operator()()const
+  {
+    return m_data;
+  }
+
+  QString toPgString() const;
+  static PgArray fromPgString(const QString &str);
+private:
+  C m_data;
+};
+
+// helper to convert a postgres array (one-dimensional) into a std::vector<T> and vice versa
+// { 1, 5, 5, 2, 9 }
+using IntArray = PgArray<int, std::vector<int>>;                    // integer[]
+using BigintArray = PgArray<int64_t, std::vector<int64_t>>;         // bigint[]
+// helper to convert a two-dimensional postgres array into a std::map<T, T> and vice versa
+// { { 1, 2 }, { 4, 3 }, { 10, 1 } }
+using IntArray2D = PgArray<int, std::map<int, int>>;                // integer[][]
+using BigintArray2D = PgArray<int64_t, std::map<int64_t, int64_t>>; // bigint[][]
+
+} // namespace LtsUtils