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function_ref: enable construction from pair of function and data

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This commit is contained in:
Aliaksei Kandratsenka 2024-10-08 18:39:32 -04:00
parent 3f04893eee
commit 2e6061d07a
1 changed files with 14 additions and 6 deletions
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20
src/base/function_ref.h
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@ -64,12 +64,16 @@ struct FunctionRef<R(Args...)> {
typename std::enable_if<std::is_void<R>::value ||
std::is_convertible<FR, R>::value>::type;
explicit FunctionRef(R (*fn)(Args..., void*), void* data)
: fn(fn), data(data) {}
template <typename Body, typename = EnableIfCompatible<const Body&>>
FunctionRef(const Body& body)
: fn([] (Args... args, void* data) {
FunctionRef(const Body& body) : FunctionRef(
[] (Args... args, void* data) {
const Body& b = *(reinterpret_cast<const Body*>(data));
return b(std::forward<Args>(args)...);
}), data(const_cast<void*>(reinterpret_cast<const void*>(&body))) {}
},
const_cast<void*>(reinterpret_cast<const void*>(&body))) {}
R operator()(Args... args) const {
return fn(std::forward<Args>(args)..., data);
@ -92,12 +96,16 @@ struct FunctionRefFirstDataArg<R(Args...)> {
typename std::enable_if<std::is_void<R>::value ||
std::is_convertible<FR, R>::value>::type;
explicit FunctionRefFirstDataArg(R (*fn)(void*, Args...), void* data)
: fn(fn), data(data) {}
template <typename Body>
FunctionRefFirstDataArg(const Body& body)
: fn([] (void* data, Args... args) {
FunctionRefFirstDataArg(const Body& body) : FunctionRefFirstDataArg(
[] (void* data, Args... args) {
const Body& b = *(reinterpret_cast<const Body*>(data));
return b(std::forward<Args>(args)...);
}), data(const_cast<void*>(reinterpret_cast<const void*>(&body))) {}
},
const_cast<void*>(reinterpret_cast<const void*>(&body))) {}
R operator()(Args... args) const {
return fn(data, std::forward<Args>(args)...);