45 lines
915 B
C++
45 lines
915 B
C++
/**
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* @file mix_cc/sql/statement.h
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* @brief 语句类基类
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* @author Cat (null.null.null@qq.com)
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* @version 0.1
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* @date 2021-09-17
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*
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* Copyright: Baosight Co. Ltd.
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* DO NOT COPY/USE WITHOUT PERMISSION
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*
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*/
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#pragma once
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#include <mix_cc/sql/public.h>
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namespace mix_cc {
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namespace sql {
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struct statement_t {};
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template <typename PrevStatement>
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struct prev_statement_t {
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explicit constexpr prev_statement_t(PrevStatement prev_st)
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: prev_st_(prev_st) {}
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constexpr auto parse_prev() {
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return hana::flatten(
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hana::make_tuple(prev_st_.parse_prev(), hana::make_tuple(prev_st_)));
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}
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protected:
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PrevStatement prev_st_;
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};
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template <>
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struct prev_statement_t<void> {
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constexpr prev_statement_t() {}
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constexpr auto parse_prev() { return hana::make_tuple(); }
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};
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template <typename Tp>
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constexpr auto get_value(Tp val) {
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return val;
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}
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} // namespace sql
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} // namespace mix_cc
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