https://llvm.org/bugs/show_bug.cgi?id=26724
Bug ID: 26724
Summary: ICE on complex lambda calls
Product: clang
Version: 3.7
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: unassignedclangb...@nondot.org
Reporter: tower...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
http://coliru.stacked-crooked.com/a/b88b42eebfa5aed1
clang -std=c++14 -O2 -Wall -Wextra -pedantic -pthread main.cpp && ./a.out
Code as is:
#include <type_traits>
#include <iostream>
#include <utility>
#include <cassert>
#include <utility>
#include <functional>
#include <iostream>
#include <string>
#include <vector>
#define CAT1(A, B) A ## B
#define CAT(A, B) CAT1(A, B)
#define ALWAYS_INLINE
/// ----------------------------------------------------------------
/// ----------------------------------------------------------------
///
/// CHANGING to c++14's decltype(auto) solves problem
///
template<class FN1, class FN2, class... Args>
ALWAYS_INLINE constexpr decltype(auto) if_else(std::true_type, FN1 &&fn1, FN2
&&, Args&&... args)
{
return std::forward<FN1>(fn1)(std::forward<Args>(args)...);
}
template<class FN1, class FN2, class... Args>
ALWAYS_INLINE constexpr decltype(auto) if_else(std::false_type, FN1 &&, FN2
&&fn2, Args&&... args)
{
return std::forward<FN2>(fn2)(std::forward<Args>(args)...);
}
template<bool do_it, class FN1, class FN2, class... Args>
ALWAYS_INLINE constexpr decltype(auto) if_else(FN1 &&fn1, FN2 &&fn2, Args&&...
args)
{
return if_else(std::integral_constant<bool,do_it>{}, fn1, fn2,
std::forward<Args>(args)...);
}
template<bool do_it, class FN1, class FN2>
ALWAYS_INLINE constexpr decltype(auto) if_else(FN1 &&fn1, FN2 &&fn2)
{
return if_else(std::integral_constant<bool,do_it>{}, fn1, fn2,
std::false_type() ); // just a fake unused value
}
// true_type / false_type
template<class bool_const, class FN1, class FN2, class... Args>
ALWAYS_INLINE constexpr decltype(auto) if_else(FN1 &&fn1, FN2 &&fn2, Args&&...
args)
{
return if_else(std::integral_constant<bool,bool_const::value>{}, fn1, fn2,
std::forward<Args>(args)...);
}
template<class bool_const, class FN1, class FN2>
ALWAYS_INLINE constexpr decltype(auto) if_else(FN1 &&fn1, FN2 &&fn2)
{
return if_else(std::integral_constant<bool,bool_const::value>{}, fn1, fn2,
std::false_type() ); // just a fake unused value
}
/// ----------------------------------------------------------------
/// ----------------------------------------------------------------
template <typename T>
struct FunctionArity : FunctionArity<decltype(&T::operator())> {};
template <typename R, typename... Args>
struct FunctionArity<R(*)(Args...)> : std::integral_constant<unsigned,
sizeof...(Args)> {};
template <typename R, typename C, typename... Args>
struct FunctionArity<R(C::*)(Args...)> : std::integral_constant<unsigned,
sizeof...(Args)> {};
template <typename R, typename C, typename... Args>
struct FunctionArity<R(C::*)(Args...) const> : std::integral_constant<unsigned,
sizeof...(Args)> {};
template<typename TFunc>
constexpr auto function_arity(TFunc)
{
return FunctionArity<TFunc>{};
}
#define function_arity_t(...) decltype(function_arity(__VA_ARGS__))
#define Command(name) \
private: Empty CAT(name, _initializer) = [&](){ \
using fn_arity = function_arity_t( &SelfT:: name );\
using is_void = std::integral_constant<bool, fn_arity::value==0 >;\
if_else<is_void::value>( \
[&](auto&&) { commands.push_back( [&](int ){ name(); }); }, \
[&](auto&&) { commands.push_back( [&](int i) { name(); }); } \
); \
return Empty(); }(); \
public: void name
struct Test {
using SelfT = Test;
struct Empty {};
using CommandFn = std::function<void(int)>;
std::vector<CommandFn> commands;
Command(non_void)(/*int i*/) {
}
Command(is_void)() {
}
};
int main() {
using namespace std;
}
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