C++11: vector 初始化赋值

目录

一、std::vector 的构造函数举例

二、 std::vector 构造函数列表

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一、std::vector 的构造函数举例

#include 
#include 
#include 
 
template
std::ostream& operator<<(std::ostream& s, const std::vector& v) 
{
    s.put('[');
    char comma[3] = {'\0', ' ', '\0'};
    for (const auto& e : v) {
        s << comma << e;
        comma[0] = ',';
    }
    return s << ']';
}
 
int main() 
{
    // c++11 initializer list syntax:
    std::vector words1 {"the", "frogurt", "is", "also", "cursed"};
    std::cout << "words1: " << words1 << '\n';
    //words1: [the, frogurt, is, also, cursed]
 
    // words2 == words1
    std::vector words2(words1.begin(), words1.end());
    std::cout << "words2: " << words2 << '\n';
    //words2: [the, frogurt, is, also, cursed]
 
    // words3 == words1
    std::vector words3(words1);
    std::cout << "words3: " << words3 << '\n';
    //words3: [the, frogurt, is, also, cursed]
 
    // words4 is {"Mo", "Mo", "Mo", "Mo", "Mo"}
    std::vector words4(5, "Mo");
    std::cout << "words4: " << words4 << '\n';
    //words4: [Mo, Mo, Mo, Mo, Mo]
}

二、 std::vector 构造函数列表

• vector();
• vector( const Allocator& alloc );
• vector( size_type count, const T& value, const Allocator& alloc = Allocator());
• vector( size_type count );
• vector( InputIt first, InputIt last,  const Allocator& alloc = Allocator() );
• vector( const vector& other );
• vector( const vector& other, const Allocator& alloc );
• vector( vector&& other );
• vector( vector&& other, const Allocator& alloc );
• vector( std::initializer_list init, const Allocator& alloc = Allocator() );

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