Flecs v3.2
A fast entity component system (ECS) for C & C++
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impl.hpp
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1
6#pragma once
7
8namespace flecs {
9
10inline metrics::metrics(flecs::world& world) {
11 world.import<flecs::units>();
12
13 /* Import C module */
14 FlecsMetricsImport(world);
15
16 world.entity<metrics::Instance>("::flecs::metrics::Instance");
17 world.entity<metrics::Metric>("::flecs::metrics::Metric");
18 world.entity<metrics::Counter>("::flecs::metrics::Metric::Counter");
19 world.entity<metrics::CounterId>("::flecs::metrics::Metric::CounterId");
20 world.entity<metrics::CounterIncrement>("::flecs::metrics::Metric::CounterIncrement");
21 world.entity<metrics::Gauge>("::flecs::metrics::Metric::Gauge");
22}
23
24inline metric_builder::~metric_builder() {
25 if (!m_created) {
26 ecs_metric_init(m_world, &m_desc);
27 }
28}
29
30inline metric_builder& metric_builder::member(const char *name) {
31 return member(flecs::world(m_world).lookup(name));
32}
33
34template <typename T>
35inline metric_builder& metric_builder::member(const char *name) {
36 flecs::entity e (m_world, _::cpp_type<T>::id(m_world));
37 flecs::entity_t m = e.lookup(name);
38 if (!m) {
39 flecs::log::err("member '%s' not found in type '%s'",
40 name, e.path().c_str());
41 return *this;
42 }
43 return member(m);
44}
45
46inline metric_builder& metric_builder::dotmember(const char *expr) {
47 m_desc.dotmember = expr;
48 return *this;
49}
50
51template <typename T>
52inline metric_builder& metric_builder::dotmember(const char *expr) {
53 m_desc.dotmember = expr;
54 m_desc.id = _::cpp_type<T>::id(m_world);
55 return *this;
56}
57
58inline metric_builder::operator flecs::entity() {
59 if (!m_created) {
60 m_created = true;
61 flecs::entity result(m_world, ecs_metric_init(m_world, &m_desc));
62 m_desc.entity = result;
63 return result;
64 } else {
65 return flecs::entity(m_world, m_desc.entity);
66 }
67}
68
69template <typename... Args>
70inline flecs::metric_builder world::metric(Args &&... args) const {
71 flecs::entity result(m_world, FLECS_FWD(args)...);
72 return flecs::metric_builder(m_world, result);
73}
74
75template <typename Kind>
76inline untyped_component& untyped_component::metric(
77 flecs::entity_t parent,
78 const char *brief,
79 const char *metric_name)
80{
81 flecs::world w(m_world);
82 flecs::entity e(m_world, m_id);
83
84 const flecs::member_t *m = ecs_cpp_last_member(w, e);
85 if (!m) {
86 return *this;
87 }
88
89 flecs::entity me = w.entity(m->member);
90 flecs::entity metric_entity = me;
91 if (parent) {
92 const char *component_name = e.name();
93 if (!metric_name) {
94 if (ecs_os_strcmp(m->name, "value") || !component_name) {
95 metric_entity = w.scope(parent).entity(m->name);
96 } else {
97 // If name of member is "value", use name of type.
98 char *snake_name = flecs_to_snake_case(component_name);
99 metric_entity = w.scope(parent).entity(snake_name);
100 ecs_os_free(snake_name);
101 }
102 } else {
103 metric_entity = w.scope(parent).entity(metric_name);
104 }
105 }
106
107 w.metric(metric_entity).member(me).kind<Kind>().brief(brief);
108
109 return *this;
110}
111
112}
FLECS_API ecs_entity_t ecs_metric_init(ecs_world_t *world, const ecs_metric_desc_t *desc)
Create a new metric.
flecs::entity import()
Import a module.
flecs::entity entity(Args &&... args) const
Create an entity.
void err(const char *fmt,...)
Trace (level -3)
Definition log.hpp:68
Element type of members vector in EcsStruct.
Definition meta.h:208
const char * name
Must be set when used with ecs_struct_desc_t.
Definition meta.h:210
ecs_id_t id
Tracks whether entities have the specified component id.
Definition metrics.h:89
Self & scope(const Func &func)
The function will be ran with the scope set to the current entity.
Definition builder.hpp:925
flecs::string_view name() const
Return the entity name.
flecs::entity parent() const
Get parent of entity.
Definition impl.hpp:73
Entity.
Definition entity.hpp:30
Event builder interface.
Definition builder.hpp:18
The world.
Definition world.hpp:132
flecs::metric_builder metric(Args &&... args) const
Create metric.