通过std::tuple_element获取元素类型。 template<typename Tuple> void Fun(Tuple& tp) { std::tuple_element<0,Tuple>::type first = std::get<0>(mytuple); std::tuple_element<1,Tuple>::type second = std::get<1>(mytuple); } 获取
std::tuple_element<0, decltype(tup1)>::type 这样就获取到了tup1中第一个元素的数据类型。 注意:获取到的就是数据类型,如int,char。而不是写有“int”或者“char”的字符串。 3. size: 获取tuple中元素个数 std::tuple<float,string> tup1(3.14,"pi"); cout<< tuple_size<decltype(tup1)>::value...
tuple_size 是定义在 头文件的类模板,它只有一个成员变量 value,功能是获取某个 tuple 对象中元素的个数,type 为该tuple 对象的类型。 tuple_element<I, type>::type tuple_element 是定义在 头文件的类模板,它只有一个成员变量 type,功能是获取某个 tuple 对象第 I+1 个元素的类型。 forward_as_tuple<ar...
tuple_element 获得指定元素的类型 (类模板特化) std::uses_allocator<std::tuple> (C++11) 特化std::uses_allocator 类型特征 (类模板特化) 常量 ignore 用tie 解包tuple 时用来跳过元素的占位符 (常量) 函数 make_tuple 创建一个 tuple 对象,其类型根据各实参类型定义 (函数模板) tie 创建左值...
...<" "<<B.x<<" "<<B.y<<endl; return 0; } 补充tuple tuple(int,string) foo(); tie(a,b)=foo(); b.c_str...tuple_element::type cnt = std::get(t); std::cout << "cnt = " << cnt << std::endl; //比较 1K20...
tuple接口 array<string,3>a={"hello","hwo","are"};tuple_size::value;tuple_element<1,a>::type;// stringget<1>(a); C++ Copy Compile & Run 把array当做c风格的数组来用 //--- array as c-style array ---RUN_GTEST(ArrayTest,CStyleArray,@);// use array<char> as a fix sized ...
return std::string("Hello from an unknown system!"); #endif } int main() { std::cout << say_hello() << std::endl; return EXIT_SUCCESS; } 如何操作 让我们构建一个对应的CMakeLists.txt实例,这将使我们能够根据目标操作系统有条件地编译源代码: ...
N3887 tuple_element_t VS 2015 N3891 Renaming shared_mutex (Timed) To shared_timed_mutex VS 2015 N3346 Minimal Container Element Requirements VS 2013 N3421 Transparent Operator Functors (less<>, etc.) VS 2013 N3655 Alias Templates For <type_traits> (decay_t, etc.) VS...
N3887 tuple_element_t VS 2015 N3891 Renaming shared_mutex (Timed) To shared_timed_mutex VS 2015 N3346 Minimal Container Element Requirements VS 2013 N3421 Transparent Operator Functors (less<>, etc.) VS 2013 N3655 Alias Templates For <type_traits> (decay_t, etc.) VS...
N3887 tuple_element_t VS 2015 N3891 Renaming shared_mutex (Timed) To shared_timed_mutex VS 2015 N3346 Minimal Container Element Requirements VS 2013 N3421 Transparent Operator Functors (less<>, etc.) VS 2013 N3655 Alias Templates For <type_traits> (decay_t, etc.) VS...