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feat(utils/general): provide a new L_RESOLVE_OVERLOAD macro to get a function pointer of overloaded functions set

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This commit is contained in:
Ronan Abhamon 2018-01-10 12:00:13 +01:00
parent 798c9502ff
commit e3219d2ee9
1 changed files with 56 additions and 0 deletions
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56
include/linphone/utils/general.h
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@ -38,6 +38,10 @@
LINPHONE_BEGIN_NAMESPACE
// -----------------------------------------------------------------------------
// Export.
// -----------------------------------------------------------------------------
#ifndef LINPHONE_PUBLIC
#if defined(_MSC_VER)
#ifdef LINPHONE_STATIC
@ -66,6 +70,10 @@ LINPHONE_BEGIN_NAMESPACE
#ifdef __cplusplus
// -----------------------------------------------------------------------------
// Debug.
// -----------------------------------------------------------------------------
void l_assert (const char *condition, const char *file, int line);
#ifdef DEBUG
@ -74,6 +82,10 @@ void l_assert (const char *condition, const char *file, int line);
#define L_ASSERT(CONDITION) static_cast<void>(false && (CONDITION))
#endif
// -----------------------------------------------------------------------------
// Optimization.
// -----------------------------------------------------------------------------
#ifndef _MSC_VER
#define L_LIKELY(EXPRESSION) __builtin_expect(static_cast<bool>(EXPRESSION), true)
#define L_UNLIKELY(EXPRESSION) __builtin_expect(static_cast<bool>(EXPRESSION), false)
@ -82,9 +94,17 @@ void l_assert (const char *condition, const char *file, int line);
#define L_UNLIKELY(EXPRESSION) EXPRESSION
#endif
// -----------------------------------------------------------------------------
// Misc.
// -----------------------------------------------------------------------------
// Define an integer version like: 0xXXYYZZ, XX=MAJOR, YY=MINOR, and ZZ=PATCH.
#define L_VERSION(MAJOR, MINOR, PATCH) (((MAJOR) << 16) | ((MINOR) << 8) | (PATCH))
// -----------------------------------------------------------------------------
// Data access.
// -----------------------------------------------------------------------------
class BaseObject;
class BaseObjectPrivate;
class ClonableObject;
@ -212,6 +232,42 @@ struct AddConstMirror<const T, U> {
return std::static_pointer_cast<const CLASS>(Object::getSharedFromThis()); \
}
// -----------------------------------------------------------------------------
// Overload.
// -----------------------------------------------------------------------------
namespace Private {
template<typename... Args>
struct ResolveMemberFunctionOverload {
template<typename Ret, typename Obj>
constexpr auto operator() (Ret (Obj::*func)(Args...)) const -> decltype(func) {
return func;
}
};
template<typename... Args>
struct ResolveConstMemberFunctionOverload {
template<typename Ret, typename Obj>
constexpr auto operator() (Ret (Obj::*func)(Args...) const) const -> decltype(func) {
return func;
}
};
template<typename... Args>
struct ResolveOverload : ResolveMemberFunctionOverload<Args...>, ResolveConstMemberFunctionOverload<Args...> {
using ResolveMemberFunctionOverload<Args...>::operator();
using ResolveConstMemberFunctionOverload<Args...>::operator();
template<typename Ret>
constexpr auto operator() (Ret (*func)(Args...)) const -> decltype(func) {
return func;
}
};
}
// Useful to select a specific overloaded function. (Avoid usage of static_cast.)
#define L_RESOLVE_OVERLOAD(ARGS) LinphonePrivate::Private::ResolveOverload<ARGS>
// -----------------------------------------------------------------------------
// Wrapper public.
// -----------------------------------------------------------------------------