通过

<string> 运算符

  • 项目

operator!=
operator>
operator>>
operator>=
operator<
operator<<
operator<=
operator+
operator==

operator+

连接两个字符串对象。

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator> operator+(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator> operator+(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator> operator+(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator> operator+(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator> operator+(
    const CharType left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>&& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const basic_string<CharType, Traits, Allocator>&& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const basic_string<CharType, Traits, Allocator>&& left,
    const basic_string<CharType, Traits, Allocator>&& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const basic_string<CharType, Traits, Allocator>&& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const basic_string<CharType, Traits, Allocator>&& left,
    CharType right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>&& right);

template <class CharType, class Traits, class Allocator>
basic_string<CharType, Traits, Allocator>&& operator+(
    CharType left,
    const basic_string<CharType, Traits, Allocator>&& right);

参数

left
要连接的 C 样式字符串或类型 basic_string 的对象。

right
要连接的 C 样式字符串或类型 basic_string 的对象。

返回值

是输入字符串的串联的字符串。

备注

每个函数均重载 operator+ 以连接类模板 basic_string 类的两个对象。 全部有效地返回 basic_string< CharType, Traits, Allocator>(Left).append(right)。 有关详细信息，请参阅追加。

示例

// string_op_con.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;
   // Declaring an object of type basic_string<char>
   string s1 ( "anti" );
   string s2 ( "gravity" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "heroine";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // Declaring a character constant
   char c1 = '!';
   cout << "The character constant c1 = " << c1 << "." << endl;

   // First member function: concatenates an  object
   // of type basic_string with an object of type basic_string
   string s12 = s1 + s2;
   cout << "The string concatenating s1 & s2 is: " << s12 << endl;

   // Second & fourth member functions: concatenate an object
   // of type basic_string with an object of C-syle string type
   string s1s3 = s1 + s3;
   cout << "The string concatenating s1 & s3 is: " << s1s3 << endl;

   // Third & fifth member functions: concatenate an object
   // of type basic_string with a character constant
   string s1s3c1 = s1s3 + c1;
   cout << "The string concatenating s1 & s3 is: " << s1s3c1 << endl;
}

The basic_string s1 = anti.
The basic_string s2 = gravity.
The C-style string s3 = heroine.
The character constant c1 = !.
The string concatenating s1 & s2 is: antigravity
The string concatenating s1 & s3 is: antiheroine
The string concatenating s1 & s3 is: antiheroine!

operator!=

测试运算符左侧的字符串对象是否不等于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator!=(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator!=(
    const basic_string<CharType, Traits, Allocator>& left,
const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator!=(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序不等于右侧的字符串对象，则为 true；否则为 false。

备注

列表对象之间的比较基于其元素的字典序比较。 如果两个字符串具有相同的字符数且各自的字符值也相同，则这两个字符串相同。 否则，它们不相等。

示例

// string_op_ne.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "pluck" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "pluck";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 != s2 )
      cout << "The strings s1 & s2 are not equal." << endl;
   else
      cout << "The strings s1 & s2 are equal." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s1 != s3 )
      cout << "The strings s1 & s3 are not equal." << endl;
   else
      cout << "The strings s1 & s3 are equal." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s3 != s2 )
      cout << "The strings s3 & s2 are not equal." << endl;
   else
      cout << "The strings s3 & s2 are equal." << endl;
}

The basic_string s1 = pluck.
The basic_string s2 = strum.
The C-style string s3 = pluck.
The strings s1 & s2 are not equal.
The strings s1 & s3 are equal.
The strings s3 & s2 are not equal.

operator==

测试运算符左侧的字符串对象是否等于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator==(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator==(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator==(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序等于右侧的字符串对象，则为 true；否则为 false。

注解

列表对象之间的比较基于其元素的字典序比较。 如果两个字符串具有相同的字符数且各自的字符值也相同，则这两个字符串相同。 否则，它们不相等。

示例

// string_op_eq.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "pluck" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "pluck";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 == s2 )
      cout << "The strings s1 & s2 are equal." << endl;
   else
      cout << "The strings s1 & s2 are not equal." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s1 == s3 )
      cout << "The strings s1 & s3 are equal." << endl;
   else
      cout << "The strings s1 & s3 are not equal." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s3 == s2 )
      cout << "The strings s3 & s2 are equal." << endl;
   else
      cout << "The strings s3 & s2 are not equal." << endl;
}

The basic_string s1 = pluck.
The basic_string s2 = strum.
The C-style string s3 = pluck.
The strings s1 & s2 are not equal.
The strings s1 & s3 are equal.
The strings s3 & s2 are not equal.

operator<

测试运算符左侧的字符串对象是否小于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator<(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator<(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator<(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序小于右侧的字符串对象，则为 true；否则为 false。

备注

字符串之间按字典序逐字符进行比较：

  • 如果找到两个不相等的相应字符，则将比较结果作为字符串之间比较的结果。

  • 如果找到的所有字符完全相同，但其中一个字符串的字符数要多于另一个字符串的字符数，则将较短的字符串视为小于较长的字符串。

  • 如果找到的所有字符完全相同且字符串的字符数也相同，则这两个字符串视为相等。

示例

// string_op_lt.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;
   // Declaring an objects of type basic_string<char>
   string s1 ( "strict" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "strict";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 < s2 )
      cout << "The string s1 is less than the string s2." << endl;
   else
      cout << "The string s1 is not less than the string s2." << endl;

   // Second member function: comparison between left-hand object
   // of type basic_string & right-hand object of C-syle string type
   if ( s1 < s3 )
      cout << "The string s1 is less than the string s3." << endl;
   else
      cout << "The string s1 is not less than the string s3." << endl;

   // Third member function: comparison between left-hand object
   // of C-syle string type & right-hand object of type basic_string
   if ( s3 < s2 )
      cout << "The string s3 is less than the string s2." << endl;
   else
      cout << "The string s3 is not less than the string s2." << endl;
}

The basic_string s1 = strict.
The basic_string s2 = strum.
The C-style string s3 = strict.
The string s1 is less than the string s2.
The string s1 is not less than the string s3.
The string s3 is less than the string s2.

operator<=

测试运算符左侧的字符串对象是否小于或等于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator<=(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator<=(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator<=(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序小于或等于右侧的字符串对象，则为 true；否则为 false。

注解

字符串之间按字典序逐字符进行比较：

  • 如果找到两个不相等的相应字符，则将比较结果作为字符串之间比较的结果。

  • 如果找到的所有字符完全相同，但其中一个字符串的字符数要多于另一个字符串的字符数，则将较短的字符串视为小于较长的字符串。

  • 它没找到任何不相等的字符且字符串具有相同数量的字符，则字符串视为相等。

示例

// string_op_le.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "strict" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "strict";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 <= s2 )
      cout << "The string s1 is less than or equal to "
           << "the string s2." << endl;
   else
      cout << "The string s1 is greater than "
           << "the string s2." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s1 <= s3 )
      cout << "The string s1 is less than or equal to "
           << "the string s3." << endl;
   else
      cout << "The string s1 is greater than "
           << "the string s3." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type  & right-side object of type basic_string
   if ( s2 <= s3 )
      cout << "The string s2 is less than or equal to "
           << "the string s3." << endl;
   else
      cout << "The string s2 is greater than "
           << "the string s3." << endl;
}

The basic_string s1 = strict.
The basic_string s2 = strum.
The C-style string s3 = strict.
The string s1 is less than or equal to the string s2.
The string s1 is less than or equal to the string s3.
The string s2 is greater than the string s3.

operator<<

一个模板函数，用于向输出流写入字符串。

template <class CharType, class Traits, class Allocator>
basic_ostream<CharType, Traits>& operator<<(
    basic_ostream<CharType, Traits>& _Ostr,
    const basic_string<CharType, Traits, Allocator>& str);

参数

_Ostr
正在写入的输出流。

str
要输入到输出流的字符串。

返回值

将指定字符串的值写入输出流 _Ostr。

备注

模板函数重载 operator<< 以将类模板 basic_string 的对象 str 插入到流 _Ostr 中。 该函数有效地返回 _Ostr.write( str.c_str, str.size )。

operator>

测试运算符左侧的字符串对象是否大于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator>(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator>(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator>(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序大于右侧的字符串对象，则为 true；否则为 false。

注解

字符串之间按字典序逐字符进行比较：

  • 如果找到两个不相等的相应字符，则将比较结果作为字符串之间比较的结果。

  • 如果找到的所有字符完全相同，但其中一个字符串的字符数要多于另一个字符串的字符数，则将较短的字符串视为小于较长的字符串。

  • 如果找到的所有字符完全相同且字符串的字符数也相同，则这两个字符串视为相等。

示例

// string_op_gt.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "strict" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "stricture";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 > s2 )
      cout << "The string s1 is greater than "
           << "the string s2." << endl;
   else
      cout << "The string s1 is not greater than "
           << "the string s2." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s3 > s1 )
      cout << "The string s3 is greater than "
           << "the string s1." << endl;
   else
      cout << "The string s3 is not greater than "
           << "the string s1." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s2 > s3 )
      cout << "The string s2 is greater than "
           << "the string s3." << endl;
   else
      cout << "The string s2 is not greater than "
           << "the string s3." << endl;
}

The basic_string s1 = strict.
The basic_string s2 = strum.
The C-style string s3 = stricture.
The string s1 is not greater than the string s2.
The string s3 is greater than the string s1.
The string s2 is greater than the string s3.

operator>=

测试运算符左侧的字符串对象是否大于或等于右侧的字符串对象。

template <class CharType, class Traits, class Allocator>
bool operator>=(
    const basic_string<CharType, Traits, Allocator>& left,
    const basic_string<CharType, Traits, Allocator>& right);

template <class CharType, class Traits, class Allocator>
bool operator>=(
    const basic_string<CharType, Traits, Allocator>& left,
    const CharType* right);

template <class CharType, class Traits, class Allocator>
bool operator>=(
    const CharType* left,
    const basic_string<CharType, Traits, Allocator>& right);

参数

left
要比较的 C 样式字符串或类型 basic_string 的对象。

right
要比较的 C 样式字符串或类型 basic_string 的对象。

返回值

如果运算符左侧的字符串对象按照字典顺序大于或等于右侧的字符串对象，则为 true；否则为 false。

备注

字符串之间按字典序逐字符进行比较：

  • 如果找到两个不相等的相应字符，则将比较结果作为字符串之间比较的结果。

  • 如果找到的所有字符完全相同，但其中一个字符串的字符数要多于另一个字符串的字符数，则将较短的字符串视为小于较长的字符串。

  • 它没找到任何不相等的字符且字符串具有相同数量的字符，则字符串视为相等。

示例

// string_op_ge.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "strict" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "stricture";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 >= s2 )
      cout << "The string s1 is greater than or equal to "
           << "the string s2." << endl;
   else
      cout << "The string s1 is less than "
           << "the string s2." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s3 >= s1 )
      cout << "The string s3 is greater than or equal to "
           << "the string s1." << endl;
   else
      cout << "The string s3 is less than "
           << "the string s1." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s2 >= s3 )
      cout << "The string s2 is greater than or equal to "
           << "the string s3." << endl;
   else
      cout << "The string s2 is less than "
           << "the string s3." << endl;
}

The basic_string s1 = strict.
The basic_string s2 = strum.
The C-style string s3 = stricture.
The string s1 is less than the string s2.
The string s3 is greater than or equal to the string s1.
The string s2 is greater than or equal to the string s3.

operator>>

一个模板函数，用于从输入流读取字符串。

template <class CharType, class Traits, class Allocator>
basic_istream<CharType, Traits>& operator>>(
    basic_istream<CharType, Traits>& _Istr,
    basic_string<CharType, Traits, Allocator>& right);

参数

_Istr
用来提取序列的输入流

right
正在从输入流提取的字符串。

返回值

从 _Istr 读取指定的字符串值，并将其返回到 right。

备注

除非已设置 skipws 标志，否则运算符将跳过前导空白字符。 它读取以下所有字符，直到下一个字符是空格或到达文件末尾。

使用从流 _Istr 中提取的一系列元素，模板函数将重载 operator>> 以替换 right 控制的序列。 提取将在以下位置停止：

  • 在文件结尾。

  • 函数提取 _Istr. width 元素之后（如果该值不为零）。

函数提取 _Istr. max_size 元素之后。

  • 函数提取 ch 元素之后并且该元素的 use_facet<ctype<CharType>>( getloc)。 is( ctype<CharType>:: space, ch) 为 true 时，放回字符。

如果函数没有提取任何元素，则会调用 setstate(ios_base::failbit)。 在任何情况下，函数都会调用 istr. width(0) 并返回 * this。

示例

// string_op_read_.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( )
{
   using namespace std;

   string c0;
   cout << "Input a string c0 ( try: Fibonacci numbers ): ";
   cin >> c0;
   cout << "The string entered is c0 = " << c0 << endl;
}

另请参阅

<字符串>