forked from OSchip/llvm-project
26 lines
851 B
C++
26 lines
851 B
C++
// RUN: %clang_cc1 -std=c++2a -verify %s
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template<typename ...T, typename ...Lambda> void check_sizes(Lambda ...L) {
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static_assert(((sizeof(T) == sizeof(Lambda)) && ...));
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}
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template<typename ...T> void f(T ...v) {
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// Pack expansion of lambdas: each lambda captures only one pack element.
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check_sizes<T...>([=] { (void)&v; } ...);
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// Pack expansion inside lambda: captures all pack elements.
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auto l = [=] { ((void)&v, ...); };
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static_assert(sizeof(l) >= (sizeof(T) + ...));
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}
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template void f(int, char, double);
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namespace PR41576 {
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template <class... Xs> constexpr int f(Xs ...xs) {
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return [&](auto ...ys) { // expected-note {{instantiation}}
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return ((xs + ys), ...); // expected-warning {{left operand of comma operator has no effect}}
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}(1, 2);
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}
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static_assert(f(3, 4) == 6); // expected-note {{instantiation}}
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}
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