std::piecewise_construct
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| constexpr piecewise_construct_t piecewise_construct = std::piecewise_construct_t(); |
（C++11 起） | |
的不断std::piecewise_construct的一个实例，一个空的结构标签类型std::piecewise_construct_t
Original:
The constant std::piecewise_construct is an instance of an empty struct tag type std::piecewise_construct_t.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[编辑] 为例
#include <iostream> #include <utility> #include <tuple> struct Foo { Foo(std::tuple<int, float>) { std::cout << "Constructed a Foo from a tuple\n"; } Foo(int, float) { std::cout << "Constructed a Foo from an int and a float\n"; } }; int main() { std::tuple<int, float> t(1, 3.14); std::pair<Foo, Foo> p1(t, t); std::pair<Foo, Foo> p2(std::piecewise_construct, t, t); }
Output:
Constructed a Foo from a tuple Constructed a Foo from a tuple Constructed a Foo from an int and a float Constructed a Foo from an int and a float
[编辑] 另请参阅
| （C++11） |
使用的标签类型选择正确的重载函数，分段建设 Original: tag type used to select correct function overload for piecewise construction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （类） |
