sizeof...(Types) == sizeof...(UTypes), std::is_constructible_v<Ti, decltype(std::get<i>(FWD(other)))> is true for all i, and either sizeof...(Types) is not 1, or (when Types... expands to T and UTypes... expands to U) std::is_convertible_v<decltype(other), ...
std::tuple_size interacts with the core language: it can provide structured binding support in the tuple-like case. (2-4) are SFINAE-friendly: if std::tuple_size<T>::value is ill-formed when treated as an unevaluated operand, they do not provide the member value. Access checking is ...
autofoo()->std::tuple<int,int,std::string>{return{114,514,"1919810"};}intmain(){autof=foo...
tuplet::tupletakes advantage of empty-base-optimization and[[no_unique_address]]. This means that empty types don't contribute to the size of the tuple. Canstd::tuplebe rewritten to have these properties? Not without both an ABI break and a change to it's API. There are a few reasons...
int len = str1.size(); cout<<"\nLength of string:"<<len; cout << endl; return (0); } Output: WORLD Length of string:5 In the above code, as we have seen, we declare a string object str1 and then using the insert method, we add characters one by one at the end of the ...
total(state, Fixnum::from(new_size)); start(state, Fixnum::from(0));tuple(state, nt); } } 开发者ID:code0100fun,项目名称:rubinius,代码行数:19,代码来源:array.cpp 示例6: VOLT_DEBUG ▲点赞 1▼ std::stringTable::debug(conststd::string&spacer)const{ ...
template<size_t_Idx,typename_Head,bool=__empty_not_final<_Head>::value>struct_Head_base;template<size_t_Idx,typename_Head>struct_Head_base<_Idx,_Head,true>:public_Head{constexpr_Head_base():_Head(){}constexpr_Head_base(const_Head&__h):_Head(__h){}constexpr_Head_base(const_Head_...
num_args = PySequence_Fast_GET_SIZE(fast_args); converted_args =PyTuple_New(num_args);if(converted_args ==NULL)gotocleanup;for(arg_num =0; arg_num < num_args; ++arg_num) { PyObject *borrowed_arg, *converted_arg; borrowed_arg = PySequence_Fast_GET_ITEM(fast_args, arg_num);if(...
https://github.com/nlohmann/json/issues/2226 using Tuple = std::tuple<Types&&...>; if constexpr (sizeof...(Types) == 1 && (std::is_same_v<std::decay_t<Types>, nlohmann::json> || ...) && !has_checkEmplace_with_parameters_v<Derived, Tuple&&> && !has_checkEmplace_with_...
C++ Utilities library std::tuple Defined in header <tuple> template< class... Types > class tuple; (since C++11) Class template std::tuple is a fixed-size collection of heterogeneous values. It is a generalization of std::pair. If (std::is_trivially_destructible_v<Types> && ......