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-rw-r--r--src/database/select_query.hpp77
1 files changed, 32 insertions, 45 deletions
diff --git a/src/database/select_query.hpp b/src/database/select_query.hpp
index cd9943c..f7496a4 100644
--- a/src/database/select_query.hpp
+++ b/src/database/select_query.hpp
@@ -15,48 +15,37 @@
using namespace std::string_literals;
template <typename T>
-typename std::enable_if<std::is_integral<T>::value, std::int64_t>::type
-extract_row_value(Statement& statement, const int i)
+auto extract_row_value(Statement& statement, const int i)
{
- return statement.get_column_int64(i);
-}
-
-template <typename T>
-typename std::enable_if<std::is_same<std::string, T>::value, T>::type
-extract_row_value(Statement& statement, const int i)
-{
- return statement.get_column_text(i);
-}
-
-template <typename T>
-typename std::enable_if<std::is_same<std::optional<bool>, T>::value, T>::type
-extract_row_value(Statement& statement, const int i)
-{
- const auto integer = statement.get_column_int(i);
- if (integer > 0)
- return true;
- else if (integer < 0)
- return false;
- return std::nullopt;
+ if constexpr(std::is_integral<T>::value)
+ return statement.get_column_int64(i);
+ else if constexpr (std::is_same<std::string, T>::value)
+ return statement.get_column_text(i);
+ else if (std::is_same<std::optional<bool>, T>::value)
+ {
+ const auto integer = statement.get_column_int(i);
+ if (integer > 0)
+ return std::optional<bool>{true};
+ else if (integer < 0)
+ return std::optional<bool>{false};
+ return std::optional<bool>{};
+ }
}
template <std::size_t N=0, typename... T>
-typename std::enable_if<N < sizeof...(T), void>::type
-extract_row_values(Row<T...>& row, Statement& statement)
+void extract_row_values(Row<T...>& row, Statement& statement)
{
- using ColumnType = typename std::remove_reference<decltype(std::get<N>(row.columns))>::type;
+ if constexpr(N < sizeof...(T))
+ {
+ using ColumnType = typename std::remove_reference<decltype(std::get<N>(row.columns))>::type;
- auto&& column = std::get<N>(row.columns);
- column.value = static_cast<decltype(column.value)>(extract_row_value<typename ColumnType::real_type>(statement, N));
+ auto&& column = std::get<N>(row.columns);
+ column.value = static_cast<decltype(column.value)>(extract_row_value<typename ColumnType::real_type>(statement, N));
- extract_row_values<N+1>(row, statement);
+ extract_row_values<N + 1>(row, statement);
+ }
}
-template <std::size_t N=0, typename... T>
-typename std::enable_if<N == sizeof...(T), void>::type
-extract_row_values(Row<T...>&, Statement&)
-{}
-
template <typename... T>
struct SelectQuery: public Query
{
@@ -69,23 +58,21 @@ struct SelectQuery: public Query
}
template <std::size_t N=0>
- typename std::enable_if<N < sizeof...(T), void>::type
- insert_col_name()
+ void insert_col_name()
{
- using ColumnsType = std::tuple<T...>;
- using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnsType>()))>::type;
+ if constexpr(N < sizeof...(T))
+ {
+ using ColumnsType = std::tuple<T...>;
+ using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnsType>()))>::type;
- this->body += " " + std::string{ColumnType::name};
+ this->body += " " + std::string{ColumnType::name};
- if (N < (sizeof...(T) - 1))
- this->body += ", ";
+ if (N < (sizeof...(T) - 1))
+ this->body += ", ";
- this->insert_col_name<N+1>();
+ this->insert_col_name<N + 1>();
+ }
}
- template <std::size_t N=0>
- typename std::enable_if<N == sizeof...(T), void>::type
- insert_col_name()
- {}
SelectQuery& where()
{