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How do I initialize a member array with an initializer_list?5个
这是否可能?
这是否可能?
#include <array> #include <initializer_list> struct A { A ( std::initializer_list< int > l ) : m_a ( l ) { } std::array<int,2> m_a; }; int main() { A a{ 1,2 }; }
但是这会导致这个错误:
t.cpp: In constructor ‘A::A(std::initializer_list<int>)’: t.cpp:7:19: error: no matching function for call to ‘std::array<int,2ul>::array(std::initializer_list<int>&)’ : m_a ( l ) ^ t.cpp:7:19: note: candidates are: In file included from t.cpp:1:0: /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: std::array<int,2ul>::array() struct array ^ /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: candidate expects 0 arguments,1 provided /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: constexpr std::array<int,2ul>::array(const std::array<int,2ul>&) /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: no kNown conversion for argument 1 from ‘std::initializer_list<int>’ to ‘const std::array<int,2ul>&’ /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: constexpr std::array<int,2ul>::array(std::array<int,2ul>&&) /usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/include/g++-v4/array:81:12: note: no kNown conversion for argument 1 from ‘std::initializer_list<int>’ to ‘std::array<int,2ul>&&’
解决方法
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