C++ 编译器错误 C3493：无法隐式捕获“func”，因为未指定默认捕获模式
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Compiler error C3493: 'func' cannot be implicitly captured because no default capture mode has been specified
提问by Thomas Bonini
Can you help me resolve this compiler error?
你能帮我解决这个编译器错误吗？
template<class T>
static void ComputeGenericDropCount(function<void(Npc *, int)> func)
{
T::ForEach([](T *what) {
Npc *npc = Npc::Find(what->sourceId);
if(npc)
func(npc, what->itemCount); // <<<<<<< ERROR HERE
// Error 1 error C3493: 'func' cannot be implicitly captured because no default capture mode has been specified
});
}
static void PreComputeNStar()
{
// ...
ComputeGenericDropCount<DropSkinningNpcCount>([](Npc *npc, int i) { npc->nSkinned += i; });
ComputeGenericDropCount<DropHerbGatheringNpcCount>([](Npc *npc, int i) { npc->nGathered += i; });
ComputeGenericDropCount<DropMiningNpcCount>([](Npc *npc, int i) { npc->nMined += i; });
}
I can't understand why it's giving me the error and I don't know how to fix it. ComputeGenericDropCount(auto func)doesn't work either.
我不明白为什么它给我错误，我不知道如何解决它。ComputeGenericDropCount(auto func)也不起作用。
回答by ronag
You need to specify how to capture funcinto the lambda.
您需要指定如何捕获func到 lambda 中。
[]don't capture anything
[]不要捕捉任何东西
[&]capture-by-reference
[&]按引用捕获
[=]capture-by-value (copy)
[=]按值捕获（复制）
T::ForEach([&](T *what) {
I'd also recommend that you should send funcby const reference.
我还建议您应该func通过常量引用发送。
static void ComputeGenericDropCount(const function<void(Npc *, int)>& func)
