C++ boost::trim用法及代碼示例

此函數包含在“boost/algorithm/string” 庫中。 Boost 字符串算法庫提供了 STL 中缺少的 string-related 算法的通用實現。 trim 函數用於從字符串中刪除所有前導或尾隨空格。輸入序列已就地修改。

trim_left():從字符串中刪除所有前導空格。
trim_right():從字符串中刪除所有尾隨空格。
trim():從字符串中刪除所有前導和尾隨空格。

用法:

Template:
trim(Input, Loc);

參數：
Input:輸入序列
Loc:用於‘space’ 分類的語言環境

返回：修改後的輸入序列沒有前導或尾隨空格。

例子：

Input:” geeks_for_geeks ”
Output:Applied left trim:“geeks_for_geeks ”
Applied right trim:” geeks_for_geeks”
Applied trim:“geeks_for_geeks”
Explanation:
The trim_left() function removes all the leading white spaces.
The trim_right() function removes all the trailing white spaces.
The trim() function removes all the leading and trailing white spaces.

下麵是使用函數boost::trim() 從字符串中刪除空格的實現：

C++


// C++ program to remove white spaces
// from string using the function
// boost::trim function
#include <boost/algorithm/string.hpp>
#include <iostream>
using namespace boost::algorithm;
using namespace std;
  
// Driver Code
int main()
{
    // Given Input
    string s1 = "    geeks_for_geeks    ";
    string s2 = "    geeks_for_geeks    ";
    string s3 = "    geeks_for_geeks    ";
  
    // Apply Left Trim on string, s1
    cout << "The original string is:\""
         << s1 << "\" \n";
    trim_left(s1);
    cout << "Applied left trim:\""
         << s1 << "\" \n\n";
  
    // Apply Right Trim on string, s2
    cout << "The original string is:\""
         << s2 << "\" \n";
    trim_right(s2);
    cout << "Applied right trim:\""
         << s2 << "\" \n\n";
  
    // Apply Trim on string, s3
    cout << "The original string is:\""
         << s3 << "\" \n";
    trim(s3);
    cout << "Applied trim:\"" << s3
         << "\" \n";
  
    return 0;
}

輸出：

The original string is:"    geeks_for_geeks    " 
Applied left trim:"geeks_for_geeks    " 

The original string is:"    geeks_for_geeks    " 
Applied right trim:"    geeks_for_geeks" 

The original string is:"    geeks_for_geeks    " 
Applied trim:"geeks_for_geeks"

時間複雜度：O(N)
輔助空間：O(1)

相關用法

注：本文由純淨天空篩選整理自newcybergypsy大神的英文原創作品 boost::trim in C++ library。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。