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c++ 11 当中的函数定义
在阅读eos源码过程中发现，在FC_REFLECT_DERIVED中定义了verify_imp和verify函数。
static auto verify_imp(const Visitor& v, int) -> decltype(v.reflector_verify(), void()) {
v.reflector_verify();
}
static auto verify(const Visitor& v) -> decltype(verify_imp(v, 0), void()) {
verify_imp(v, 0);
}