libpqxx
The C++ client library for PostgreSQL
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statement_parameters.hxx
1
13#ifndef PQXX_H_STATEMENT_PARAMETER
14#define PQXX_H_STATEMENT_PARAMETER
15
16#include <cstring>
17#include <iterator>
18#include <string>
19#include <vector>
20
21#include "pqxx/binarystring.hxx"
22#include "pqxx/strconv.hxx"
23#include "pqxx/util.hxx"
24
25
26namespace pqxx::internal
27{
28template<typename ITERATOR>
29constexpr inline auto const iterator_identity{
30 [](decltype(*std::declval<ITERATOR>()) x) { return x; }};
31
32
34
52template<typename IT, typename ACCESSOR = decltype(iterator_identity<IT>)>
54{
55public:
57 constexpr dynamic_params(IT begin, IT end) :
58 m_begin(begin), m_end(end), m_accessor(iterator_identity<IT>)
59 {}
60
62
66 constexpr dynamic_params(IT begin, IT end, ACCESSOR &acc) :
67 m_begin(begin), m_end(end), m_accessor(acc)
68 {}
69
71 template<typename C>
72 explicit constexpr dynamic_params(C &container) :
73 dynamic_params(std::begin(container), std::end(container))
74 {}
75
77
81 template<typename C>
82 explicit constexpr dynamic_params(C &container, ACCESSOR &acc) :
83 dynamic_params(std::begin(container), std::end(container), acc)
84 {}
85
86 constexpr IT begin() const noexcept { return m_begin; }
87 constexpr IT end() const noexcept { return m_end; }
88
89 constexpr auto access(decltype(*std::declval<IT>()) value) const
90 -> decltype(std::declval<ACCESSOR>()(value))
91 {
92 return m_accessor(value);
93 }
94
95private:
96 IT const m_begin, m_end;
98};
99
100
102
112struct PQXX_LIBEXPORT c_params
113{
114 c_params() = default;
116 c_params(c_params const &) = delete;
117 c_params(c_params &&) = default;
118
120 void reserve(std::size_t n) &;
121
123 std::vector<char const *> values;
125 std::vector<int> lengths;
127 std::vector<format> formats;
128};
129} // namespace pqxx::internal
130#endif
Marker type: pass a dynamically-determined number of statement parameters.
Definition statement_parameters.hxx:54
constexpr dynamic_params(C &container)
Wrap a container.
Definition statement_parameters.hxx:72
constexpr dynamic_params(IT begin, IT end)
Wrap a sequence of pointers or iterators.
Definition statement_parameters.hxx:57
constexpr dynamic_params(C &container, ACCESSOR &acc)
Wrap a container.
Definition statement_parameters.hxx:82
constexpr dynamic_params(IT begin, IT end, ACCESSOR &acc)
Wrap a sequence of pointers or iterators.
Definition statement_parameters.hxx:66
Internal items for libpqxx' own use. Do not use these yourself.
Definition encodings.cxx:33
constexpr char array_separator
Element separator between SQL array elements of this type.
Definition strconv.hxx:558
Internal type: encode statement parameters.
Definition statement_parameters.hxx:113
c_params(c_params const &)=delete
Copying these objects is pointless and expensive. Don't do it.
std::vector< int > lengths
As used by libpq: lengths of non-null arguments, in bytes.
Definition statement_parameters.hxx:125
std::vector< format > formats
As used by libpq: effectively boolean "is this a binary parameter?".
Definition statement_parameters.hxx:127
std::vector< char const * > values
As used by libpq: pointers to parameter values.
Definition statement_parameters.hxx:123