你可以使用string::rfind

基于注释的完整示例:

bool EndsWith(string &str, string& key)
{
size_t keylen = key.length();
size_t strlen = str.length();

if(keylen =< strlen)
    return string::npos != str.rfind(key,strlen - keylen, keylen);
else return false;
}

使用std::string::compare:比较最后n个字符:

#include <iostream>

bool hasEnding (std::string const &fullString, std::string const &ending) {
    if (fullString.length() >= ending.length()) {
        return (0 == fullString.compare (fullString.length() - ending.length(), ending.length(), ending));
    } else {
        return false;
    }
}

int main () {
    std::string test1 = "binary";
    std::string test2 = "unary";
    std::string test3 = "tertiary";
    std::string test4 = "ry";
    std::string ending = "nary";

    std::cout << hasEnding (test1, ending) << std::endl;
    std::cout << hasEnding (test2, ending) << std::endl;
    std::cout << hasEnding (test3, ending) << std::endl;
    std::cout << hasEnding (test4, ending) << std::endl;

    return 0;
}

我知道这个问题是针对c++的，但如果有人需要一个很好的老式C函数来做到这一点:

/*  returns 1 iff str ends with suffix  */
int str_ends_with(const char * str, const char * suffix) {

  if( str == NULL || suffix == NULL )
    return 0;

  size_t str_len = strlen(str);
  size_t suffix_len = strlen(suffix);

  if(suffix_len > str_len)
    return 0;

  return 0 == strncmp( str + str_len - suffix_len, suffix, suffix_len );
}

检查str是否有后缀，使用如下:

/*
Check string is end with extension/suffix
*/
int strEndWith(char* str, const char* suffix)
{
  size_t strLen = strlen(str);
  size_t suffixLen = strlen(suffix);
  if (suffixLen <= strLen) {
    return strncmp(str + strLen - suffixLen, suffix, suffixLen) == 0;
  }
  return 0;
}

使用std::equal算法从<algorithms>与反向迭代:

std::string LogExt = ".log";
if (std::equal(LogExt.rbegin(), LogExt.rend(), filename.rbegin())) {
   …
}

从c++ 20开始引入ends_with。

让我用不区分大小写的版本扩展Joseph的解决方案(在线演示)

#include <string>
#include <cctype>

static bool EndsWithCaseInsensitive(const std::string& value, const std::string& ending) {
    if (ending.size() > value.size()) {
        return false;
    }
    return std::equal(ending.crbegin(), ending.crend(), value.crbegin(),
        [](const unsigned char a, const unsigned char b) {
            return std::tolower(a) == std::tolower(b);
        }
    );
}