diff options
Diffstat (limited to 'src/database/table.hpp')
-rw-r--r-- | src/database/table.hpp | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/src/database/table.hpp b/src/database/table.hpp index eb68418..680e7cc 100644 --- a/src/database/table.hpp +++ b/src/database/table.hpp @@ -93,32 +93,36 @@ class Table private: template <std::size_t N=0> - void add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns) + typename std::enable_if<N < sizeof...(T), void>::type + add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns) { - if constexpr(N < sizeof...(T)) - { - using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type; - if (existing_columns.count(ColumnType::name) == 0) - add_column_to_table<ColumnType>(db, this->name); - add_column_if_not_exists<N + 1>(db, existing_columns); - } + using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type; + if (existing_columns.count(ColumnType::name) == 0) + add_column_to_table<ColumnType>(db, this->name); + add_column_if_not_exists<N+1>(db, existing_columns); } + template <std::size_t N=0> + typename std::enable_if<N == sizeof...(T), void>::type + add_column_if_not_exists(DatabaseEngine&, const std::set<std::string>&) + {} template <std::size_t N=0> - void add_column_create(DatabaseEngine& db, std::string& str) + typename std::enable_if<N < sizeof...(T), void>::type + add_column_create(DatabaseEngine& db, std::string& str) { - if constexpr(N < sizeof...(T)) - { - using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type; - str += ColumnType::name; - str += " "; - str += ToSQLType<ColumnType>(db); - if (N != sizeof...(T) - 1) - str += ","; - - add_column_create<N + 1>(db, str); - } + using ColumnType = typename std::remove_reference<decltype(std::get<N>(std::declval<ColumnTypes>()))>::type; + str += ColumnType::name; + str += " "; + str += ToSQLType<ColumnType>(db); + if (N != sizeof...(T) - 1) + str += ","; + + add_column_create<N+1>(db, str); } + template <std::size_t N=0> + typename std::enable_if<N == sizeof...(T), void>::type + add_column_create(DatabaseEngine&, std::string&) + { } const std::string name; }; |