MySQL 8.0.30
Source Code Documentation
string_type.h
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22
23#ifndef DD__STRING_TYPE
24#define DD__STRING_TYPE
25
26#include <stddef.h>
27#include <sstream>
28#include <string>
29#include <system_error>
30
31#include "sql/stateless_allocator.h" // Stateless_allocator
32
33namespace dd {
34/**
35 Functor class which allocates memory for String_type. Implementation
36 uses my_malloc with key_memory_DD_String_type.
37*/
39 void *operator()(size_t s) const;
40};
41
43
44/**
45 Template alias for char-based std::basic_string.
46*/
47template <class A>
48using Char_string_template = std::basic_string<char, std::char_traits<char>, A>;
49
51
52/**
53 Template alias for char-based std::basic_stringstream.
54 */
55template <class A>
57 std::basic_stringstream<char, std::char_traits<char>, A>;
58
59/**
60 Instantiation of std::basic_stringstream with the same allocator as
61 String_type. This is needed since a std::basic_stringstream::str()
62 returns a basic_string allocated with its own allocator. Note that
63 this also means that it is difficult to use a different PSI key for
64 the stream memory as that would mean the return type of
65 Stringstream_type::str() would be different and incompatible with
66 String_type.
67
68 To work around this would require the creation of a temporary
69 String_type from the string returned from stringstream::str().
70*/
72
73template <typename LEX_STRING_TYPE>
74String_type make_string_type(const LEX_STRING_TYPE &lst) {
75 return {lst.str, lst.length};
76}
77} // namespace dd
78
79namespace std {
80
81/**
82 Specialize std::hash for dd::String_type so that it can be
83 used with unordered_ containers. Uses our standard murmur3_32
84 implementation, and the same suitability restrictions apply.
85 @see murmur3_32
86*/
87template <>
88struct hash<dd::String_type> {
90 typedef size_t result_type;
91
92 size_t operator()(const dd::String_type &s) const;
93};
94} // namespace std
95#endif /* DD__STRING_TYPE */
Stateless_allocator is a C++ STL memory allocator skeleton based on Malloc_allocator,...
Definition: stateless_allocator.h:91
The version of the current data dictionary table definitions.
Definition: dictionary_client.h:42
std::basic_string< char, std::char_traits< char >, A > Char_string_template
Template alias for char-based std::basic_string.
Definition: string_type.h:48
String_type make_string_type(const LEX_STRING_TYPE &lst)
Definition: string_type.h:74
Char_stringstream_template< String_type_allocator > Stringstream_type
Instantiation of std::basic_stringstream with the same allocator as String_type.
Definition: string_type.h:71
std::basic_stringstream< char, std::char_traits< char >, A > Char_stringstream_template
Template alias for char-based std::basic_stringstream.
Definition: string_type.h:57
Char_string_template< String_type_allocator > String_type
Definition: string_type.h:50
Stateless_allocator< char, String_type_alloc > String_type_allocator
Definition: string_type.h:42
Definition: varlen_sort.h:183
Functor class which allocates memory for String_type.
Definition: string_type.h:38
void * operator()(size_t s) const
Definition: string_type.cc:33
size_t result_type
Definition: string_type.h:90
dd::String_type argument_type
Definition: string_type.h:89