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author | louiz’ <louiz@louiz.org> | 2018-03-16 01:11:47 +0100 |
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committer | louiz’ <louiz@louiz.org> | 2018-03-16 01:13:50 +0100 |
commit | d62ca9f87906be6f046fe9d07afb8bfb69c166e3 (patch) | |
tree | 6d2f5f9d60f938b05ddf47bb6b56e51bcd42472f /src/database/table.hpp | |
parent | ba879a882e031d7b8503f78fe41d1210000c96ca (diff) | |
download | biboumi-d62ca9f87906be6f046fe9d07afb8bfb69c166e3.tar.gz biboumi-d62ca9f87906be6f046fe9d07afb8bfb69c166e3.tar.bz2 biboumi-d62ca9f87906be6f046fe9d07afb8bfb69c166e3.tar.xz biboumi-d62ca9f87906be6f046fe9d07afb8bfb69c166e3.zip |
Use if constexpr to make things a lot more readable
Diffstat (limited to 'src/database/table.hpp')
-rw-r--r-- | src/database/table.hpp | 44 |
1 files changed, 20 insertions, 24 deletions
diff --git a/src/database/table.hpp b/src/database/table.hpp index 680e7cc..eb68418 100644 --- a/src/database/table.hpp +++ b/src/database/table.hpp @@ -93,36 +93,32 @@ class Table private: template <std::size_t N=0> - typename std::enable_if<N < sizeof...(T), void>::type - add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& existing_columns) + void add_column_if_not_exists(DatabaseEngine& db, const std::set<std::string>& 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); + 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); + } } - 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> - typename std::enable_if<N < sizeof...(T), void>::type - add_column_create(DatabaseEngine& db, std::string& str) + void add_column_create(DatabaseEngine& db, std::string& 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); + 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); + } } - 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; }; |