编辑“︁C++ 字符串比较”︁（章节）

== 高级主题 ==

=== 1. 不区分大小写的比较 ===
标准库没有直接提供不区分大小写的比较，但可以通过转换字符串实现：

<syntaxhighlight lang="cpp">
#include <iostream>
#include <string>
#include <algorithm>
#include <cctype>

bool caseInsensitiveCompare(const std::string& a, const std::string& b) {
    return std::equal(a.begin(), a.end(), b.begin(), b.end(),
        [](char a, char b) {
            return std::tolower(a) == std::tolower(b);
        });
}

int main() {
    std::string str1 = "Hello";
    std::string str2 = "hElLo";
    
    if (caseInsensitiveCompare(str1, str2)) {
        std::cout << "Strings are equal (case insensitive)\n";
    } else {
        std::cout << "Strings are not equal\n";
    }
    
    return 0;
}
</syntaxhighlight>

'''输出:'''
<pre>
Strings are equal (case insensitive)
</pre>

=== 2. 使用string_view比较 ===
<code>std::string_view</code>提供轻量级的字符串比较，不涉及内存分配：

<syntaxhighlight lang="cpp">
#include <iostream>
#include <string_view>

int main() {
    std::string_view sv1 = "apple";
    std::string_view sv2 = "applet";
    
    if (sv1 == sv2) {
        std::cout << "Equal\n";
    } else if (sv1 < sv2) {
        std::cout << sv1 << " is less than " << sv2 << "\n";
    } else {
        std::cout << sv1 << " is greater than " << sv2 << "\n";
    }
    
    return 0;
}
</syntaxhighlight>

'''输出:'''
<pre>
apple is less than applet
</pre>