在C++ 11中,我们有了用于初始化类的新语法,它为我们提供了如何初始化变量的大量可能性.
{ // Example 1
int b(1);
int a{1};
int c = 1;
int d = {1};
}
{ // Example 2
std::complex<double> b(3,4);
std::complex<double> a{3,4};
std::complex<double> c = {3,4};
auto d = std::complex<double>(3,4);
auto e = std::complex<double>{3,4};
}
{ // Example 3
std::string a(3,'x');
std::string b{3,'x'}; // oops
}
{ // Example 4
std::function<int(int,int)> a(std::plus<int>());
std::function<int(int,int)> b{std::plus<int>()};
}
{ // Example 5
std::unique_ptr<int> a(new int(5));
std::unique_ptr<int> b{new int(5)};
}
{ // Example 6
std::locale::global(std::locale("")); // copied from 22.4.8.3 …Run Code Online (Sandbox Code Playgroud)