Merge branch 'release/0.35'

Conflicts:
	README.md

test_static_asserts/case.cpp

@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2015-2015, Roland Bock
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * 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 HOLDER 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.
+ */
+
+#include <iostream>
+#include "MockDb.h"
+#include "Sample.h"
+#include <sqlpp11/sqlpp11.h>
+
+namespace
+{
+  constexpr auto t = test::TabBar{};
+  constexpr auto f = test::TabFoo{};
+
+  template <typename T>
+  void print_type_on_error(std::true_type)
+  {
+  }
+
+  template <typename T>
+  void print_type_on_error(std::false_type)
+  {
+    T::_print_me_;
+  }
+
+  template <typename Assert, typename When>
+  void when_check(const When& when)
+  {
+    using CheckResult = sqlpp::check_case_when_t<When>;
+    using ExpectedCheckResult = std::is_same<CheckResult, Assert>;
+    print_type_on_error<CheckResult>(ExpectedCheckResult{});
+    static_assert(ExpectedCheckResult::value, "Unexpected check result");
+
+    using ReturnType = decltype(sqlpp::case_when(when));
+    using ExpectedReturnType = sqlpp::logic::all_t<Assert::value xor std::is_same<ReturnType, void>::value>;
+    print_type_on_error<ReturnType>(ExpectedReturnType{});
+    static_assert(ExpectedReturnType::value, "Unexpected return type");
+  }
+
+  template <typename Assert, typename When, typename Then>
+  void then_check(const When& when, const Then& then)
+  {
+    using CheckResult = sqlpp::check_case_then_t<Then>;
+    using ExpectedCheckResult = std::is_same<CheckResult, Assert>;
+    print_type_on_error<CheckResult>(ExpectedCheckResult{});
+    static_assert(ExpectedCheckResult::value, "Unexpected check result");
+
+    using ReturnType = decltype(sqlpp::case_when(when).then(then));
+    using ExpectedReturnType = sqlpp::logic::all_t<Assert::value xor std::is_same<ReturnType, void>::value>;
+    print_type_on_error<ReturnType>(ExpectedReturnType{});
+    static_assert(ExpectedReturnType::value, "Unexpected return type");
+  }
+
+  template <typename Assert, typename When, typename Then, typename Else>
+  void else_check(const When& when, const Then& then, const Else& else_)
+  {
+    using CheckResult = sqlpp::check_case_else_t<sqlpp::wrap_operand_t<Then>, Else>;
+    using ExpectedCheckResult = std::is_same<CheckResult, Assert>;
+    print_type_on_error<CheckResult>(ExpectedCheckResult{});
+    static_assert(ExpectedCheckResult::value, "Unexpected check result");
+
+    using ReturnType = decltype(sqlpp::case_when(when).then(then).else_(else_));
+    using ExpectedReturnType = sqlpp::logic::all_t<Assert::value xor std::is_same<ReturnType, void>::value>;
+    print_type_on_error<ReturnType>(ExpectedReturnType{});
+    static_assert(ExpectedReturnType::value, "Unexpected return type");
+  }
+
+  void when()
+  {
+    // OK
+    when_check<sqlpp::consistent_t>(t.gamma);
+    when_check<sqlpp::consistent_t>(t.gamma == true);
+    when_check<sqlpp::consistent_t>(count(t.alpha) > 0);
+
+    // Try assignment as "when"
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(t.gamma = true);
+
+    // Try non-boolean expression as "when"
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(t.alpha);
+
+    // Try some other types as "when"
+    when_check<sqlpp::assert_case_when_boolean_expression_t>("true");
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(42);
+    when_check<sqlpp::assert_case_when_boolean_expression_t>('c');
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(nullptr);
+
+    // Try to use a table as "when"
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(t);
+
+    // Try to use an alias as "when"
+    when_check<sqlpp::assert_case_when_boolean_expression_t>(t.gamma.as(t.beta));
+  }
+
+  void then()
+  {
+    // OK
+    then_check<sqlpp::consistent_t>(t.gamma, t.gamma);
+    then_check<sqlpp::consistent_t>(t.gamma, t.gamma == true);
+    then_check<sqlpp::consistent_t>(t.gamma, count(t.alpha) > 0);
+    then_check<sqlpp::consistent_t>(t.gamma, t.alpha);
+    then_check<sqlpp::consistent_t>(t.gamma, "true");
+    then_check<sqlpp::consistent_t>(t.gamma, 42);
+    then_check<sqlpp::consistent_t>(t.gamma, 'c');
+    then_check<sqlpp::consistent_t>(t.gamma, nullptr);
+
+    // Try to use an assignment as "then"
+    then_check<sqlpp::assert_case_then_expression_t>(t.gamma, t.gamma = true);
+
+    // Try to use a table as "then"
+    then_check<sqlpp::assert_case_then_expression_t>(t.gamma, t);
+
+    // Try to use an alias as "then"
+    then_check<sqlpp::assert_case_then_expression_t>(t.gamma, t.alpha.as(t.beta));
+  }
+
+  void else_()
+  {
+    // OK
+    else_check<sqlpp::consistent_t>(t.gamma, t.gamma, t.gamma);
+    else_check<sqlpp::consistent_t>(t.gamma, t.alpha, 42);
+    else_check<sqlpp::consistent_t>(t.gamma, t.beta, "twentyseven");
+
+    // Try to use an assignment as "else"
+    else_check<sqlpp::assert_case_else_expression_t>(t.gamma, t.alpha, t.alpha = 7);
+
+    // Try to use a table as "else"
+    else_check<sqlpp::assert_case_else_expression_t>(t.gamma, t.alpha, t);
+
+    // Try to use an alias as "else"
+    else_check<sqlpp::assert_case_else_expression_t>(t.gamma, t.alpha, t.alpha.as(t.beta));
+  }
+}
+
+int main(int, char* [])
+{
+  when();
+  then();
+  else_();
+}