标准库头文件 <ostream>

 

C++

语言

标准库头文件

自立与有宿主实现

具名要求

语言支持库

概念库 (C++20)

诊断库

工具库

字符串库

容器库

迭代器库

范围库 (C++20)

算法库

数值库

输入/输出库

本地化库

正则表达式库 (C++11)

原子操作库 (C++11)

线程支持库 (C++11)

文件系统库 (C++17)

技术规范

 

标准库头文件

语言支持
<cstddef> <limits> <climits> <coroutine>	<cfloat> <cstdint> <new> <source_location>	<typeinfo> <exception> <initializer_list> <version>	<csignal> <csetjmp> <cstdarg>
概念
<concepts>
诊断
<stdexcept>	<cassert>	<cerrno>	<system_error>
通用工具
<utility> <memory> <memory_resource> <scoped_allocator>     <compare>	<bitset> <tuple> <optional> <any> <variant>	<type_traits> <ratio> <chrono> <typeindex> <functional>	<ctime> <cstdlib>
字符串
<string> <string_view> <cstring>	<charconv> <format>	<cctype> <cwctype>	<cwchar> <cuchar>
本地化
<locale>	<codecvt>	<clocale>
容器
<span> <array> <vector>	<deque> <forward_list> <list>	<map> <set> <queue>	<unordered_map> <unordered_set> <stack>
迭代器
<iterator>
范围
<ranges>
算法
<algorithm>	<execution>
数值
<complex> <random>	<valarray> <numeric>	<bit> <numbers>	<cfenv> <cmath>
输入/输出
<iosfwd> <ios> <iomanip> <streambuf>	<istream> <ostream> <iostream>	<sstream> <fstream> <syncstream>	<cstdio> <cinttypes> <strstream>
正则表达式
<regex>
文件系统
<filesystem>
线程支持
<thread> <atomic> <mutex>	<shared_mutex> <condition_variable> <future>	<stop_token> <semaphore>	<latch> <barrier>
C 兼容
<ciso646> <cstdalign>	<cstdbool> <ccomplex>	<ctgmath>

 

此头文件是输入/输出库的一部分。

类
basic_ostream	包装给定的抽象设备（std::basic_streambuf） 并提供高层输出接口 (类模板)
std::ostream	basic_ostream<char> (typedef)
std::wostream	basic_ostream<wchar_t> (typedef)
函数
operator<<(std::basic_ostream)	插入字符数据 (函数)
操纵符
ends	输出 '\0' (函数模板)
flush	冲洗输出流 (函数模板)
endl	输出 '\n' 并冲洗输出流 (函数模板)

概要

namespace std {
    template <class charT, class traits = char_traits<charT> >
        class basic_ostream;
    typedef basic_ostream<char>    ostream;
    typedef basic_ostream<wchar_t> wostream;
 
    template <class charT, class traits>
        basic_ostream<charT,traits>& endl(basic_ostream<charT,traits>& os);
    template <class charT, class traits>
        basic_ostream<charT,traits>& ends(basic_ostream<charT,traits>& os);
    template <class charT, class traits>
        basic_ostream<charT,traits>& flush(basic_ostream<charT,traits>& os);
 
    template <class charT, class traits, class T>
        basic_ostream<charT, traits>&
        operator<<(basic_ostream<charT, traits>&& os, const T& x);
 
    // 字符插入
    template<class charT, class traits>
        basic_ostream<charT,traits>& 
        operator<<(basic_ostream<charT,traits>&, charT);
    template<class charT, class traits>
        basic_ostream<charT,traits>& 
        operator<<(basic_ostream<charT,traits>&, char);
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, char);
 
    // 有符号与无符号
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, signed char);
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, unsigned char);
    template<class charT, class traits>
        basic_ostream<charT,traits>& 
        operator<<(basic_ostream<charT,traits>&, const charT*);
    template<class charT, class traits>
        basic_ostream<charT,traits>& 
        operator<<(basic_ostream<charT,traits>&, const char*);
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, const char*);
 
    // 有符号与无符号
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, const signed char*);
    template<class traits>
        basic_ostream<char,traits>& 
        operator<<(basic_ostream<char,traits>&, const unsigned char*);
}

类 std::basic_ostream

template <class charT, class traits = char_traits<charT> >
class basic_ostream : virtual public basic_ios<charT,traits> {
public:
    // 类型（继承自 basic_ios）：
    typedef charT                     char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;
    typedef traits                    traits_type;
 
    // 构造函数/析构函数：
    explicit basic_ostream(basic_streambuf<char_type,traits>* sb);
    virtual ~basic_ostream();
 
    // 前缀/后缀：
    class sentry;
 
    // 有格式输出：
    basic_ostream<charT,traits>& operator<<(
        basic_ostream<charT,traits>& (*pf)(basic_ostream<charT,traits>&));
    basic_ostream<charT,traits>& operator<<(
        basic_ios<charT,traits>& (*pf)(basic_ios<charT,traits>&));
    basic_ostream<charT,traits>& operator<<(
        ios_base& (*pf)(ios_base&));
 
    basic_ostream<charT,traits>& operator<<(bool n);
    basic_ostream<charT,traits>& operator<<(short n);
    basic_ostream<charT,traits>& operator<<(unsigned short n);
    basic_ostream<charT,traits>& operator<<(int n);
    basic_ostream<charT,traits>& operator<<(unsigned int n);
    basic_ostream<charT,traits>& operator<<(long n);
    basic_ostream<charT,traits>& operator<<(unsigned long n);
    basic_ostream<charT,traits>& operator<<(long long n);
    basic_ostream<charT,traits>& operator<<(unsigned long long n);
    basic_ostream<charT,traits>& operator<<(float f);
    basic_ostream<charT,traits>& operator<<(double f);
    basic_ostream<charT,traits>& operator<<(long double f);
 
    basic_ostream<charT,traits>& operator<<(const void* p);
    basic_ostream<charT,traits>& operator<<(
        basic_streambuf<char_type,traits>* sb);
 
    // 无格式输出：
    basic_ostream<charT,traits>& put(char_type c);
    basic_ostream<charT,traits>& write(const char_type* s, streamsize n);
 
    basic_ostream<charT,traits>& flush();
 
    // 寻位：
    pos_type tellp();
    basic_ostream<charT,traits>& seekp(pos_type);
    basic_ostream<charT,traits>& seekp(off_type, ios_base::seekdir);
 
protected:
    basic_ostream(const basic_ostream& rhs) = delete;
    basic_ostream(basic_ostream&& rhs);
 
    // 赋值/交换
    basic_ostream& operator=(basic_ostream& rhs) = delete;
    basic_ostream& operator=(const basic_ostream&& rhs);
    void swap(basic_ostream& rhs);
};