[英]Initialising std::pair<double, std::array<std::pair<double, double>, 3> >
Can anyone advise on the correct syntax for the std::make_pair call in the std::vector::push_back call in the code below: 任何人都可以在下面的代码中为std :: vector :: push_back调用中的std :: make_pair调用提供正确的语法建议:
#include <array>
#include <vector>
#include <utility>
int main()
{
typedef std::pair<double, double> PairType;
std::vector<std::pair<double, std::array<PairType, 3> > > myVector;
double Key = 0.0;
PairType Pair1 = std::make_pair(1.0, 2.0);
PairType Pair2 = std::make_pair(3.0, 4.0);
PairType Pair3 = std::make_pair(5.0, 6.0);
myVector.push_back(std::make_pair(Key, { Pair1, Pair2, Pair3 } )); // Syntax Error
return 0;
}
The compiler (MS VS2015.2) cannot determine the type of the second argument in the std::make_pair call, which is understandable yet I don't know how to enlighten it. 编译器(MS VS2015.2)无法确定std :: make_pair调用中第二个参数的类型,这是可以理解的,但我不知道如何启发它。
It looks like the compiler cannot figure out that { Pair1, Pair2, Pair3 }
is an std::array
of three pairs. 看起来编译器无法弄清楚{ Pair1, Pair2, Pair3 }
是三对的std::array
。 Specifying the type explicitly should work: 明确指定类型应该有效:
myVector.push_back(std::make_pair(Key, std::array<PairType,3>{ Pair1, Pair2, Pair3 } ));
You could use std::experimental::make_array , if the compiler supports Library fundamentals v2 : 如果编译器支持库基础知识v2 ,您可以使用std :: experimental :: make_array :
using std::experimental::make_array;
myVector.push_back(std::make_pair(Key, make_array(Pair1, Pair2, Pair3) ));
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