我相信以下是将局部变量绑定到闭包的最便宜的方法:
void ByRValueReference(A&& a) {
}
std::function<void ()> CreateClosureByRValueReference() {
A a;
std::function<void ()> f = std::bind(&ByRValueReference, std::move(a)); // !!!
return f;
}
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但是,它不能在Clang 3.1下编译:
error: no viable conversion from '__bind<void (*)(A &&), A>' to 'std::function<void ()>'
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和gcc 4.6.1:
/usr/include/c++/4.6/functional:1778:2: error: no match for call to ‘(std::_Bind<void (*(A))(A&&)>) ()’
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我违反了标准,还是只是破坏了标准库?