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// Copyright (C) 2022 johannst
#include <cstdio>
#include <functional>
#include <map>
#include <string>
#include <type_traits>
template<typename R, typename... P>
struct registry {
using FUNC = R (*)(P...);
using SELF = registry<R, P...>;
using RET = R;
static SELF& get() {
static SELF r;
return r;
}
bool add(std::string nm, FUNC fn) {
const auto r = m_fns.insert({std::move(nm), std::move(fn)});
return r.second;
}
R invoke(const std::string& nm, P... p) const {
return invoke_impl<R>(nm, p...);
}
void dump() const {
for (const auto& it : m_fns) {
std::puts(it.first.c_str());
}
}
private:
std::map<std::string, FUNC> m_fns;
template<typename RET>
std::enable_if_t<std::is_same_v<RET, void>> invoke_impl(const std::string& nm, P... p) const {
const auto it = m_fns.find(nm);
if (it == m_fns.end()) {
return;
}
std::invoke(it->second, p...);
}
template<typename RET>
std::enable_if_t<!std::is_same_v<RET, void>, RET> invoke_impl(const std::string& nm,
P... p) const {
const auto it = m_fns.find(nm);
if (it == m_fns.end()) {
static_assert(std::is_default_constructible_v<RET>,
"RET must be default constructible");
return {};
}
return std::invoke(it->second, p...);
}
};
#define TEST_REGISTER(REGISTRY, NAME) \
static bool regfn_##REGISTRY##NAME() { \
const bool r = REGISTRY::get().add(#NAME, NAME); \
if (!r) { \
std::puts("Failed to register test " #NAME ", same name already registered!"); \
std::abort(); \
} \
return r; \
} \
static const bool reg_##REGISTRY##NAME = regfn_##REGISTRY##NAME();
#define TEST(REGISTRY, NAME, ...) \
REGISTRY::RET NAME(__VA_ARGS__); \
TEST_REGISTER(REGISTRY, NAME); \
REGISTRY::RET NAME(__VA_ARGS__)
// -- Usage 1 simple usage.
using REG1 = registry<void>;
TEST(REG1, test1) {
std::puts("REG1::test1");
}
TEST(REG1, test2) {
std::puts("REG1::test2");
}
// -- Usage 2 with convenience macro wrapper.
using REG2 = registry<void, bool>;
#define TEST2(NAME, ...) TEST(REG2, NAME, ##__VA_ARGS__)
TEST2(test1, bool val) {
printf("REG2::test1 val %d\n", val);
}
int main() {
const auto& R1 = REG1::get();
R1.dump();
R1.invoke("test1");
R1.invoke("test2");
const auto& R2 = REG2::get();
R2.dump();
R2.invoke("test1", true);
return 0;
}
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