如果需要一个string对象中从后往前进行查找
用后进/先出 的顺序查找数据
可以使用字符串成员函数rfind()
//: C03:Rparse.h
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
#ifndef RPARSE_H
#define RPARSE_H
#include <cstddef>
#include <string>
#include <vector>
#include "../TestSuite/Test.h"
using std::size_t;
using std::string;
using std::vector;
class RparseTest : public TestSuite::Test {
// To store the words:
vector<string> strings;
public:
void parseForData() {
// The ';' characters will be delimiters
string s("now.;sense;make;to;going;is;This");
// The last element of the string:
int last = s.size();
// The beginning of the current word:
size_t current = s.rfind(';');
// Walk backward through the string:
while(current != string::npos) {
// Push each word into the vector.
// Current is incremented before copying
// to avoid copying the delimiter:
++current;
strings.push_back(s.substr(current, last - current));
// Back over the delimiter we just found,
// and set last to the end of the next word:
current -= 2;
last = current + 1;
// Find the next delimiter:
current = s.rfind(';', current);
}
// Pick up the first word -- it's not
// preceded by a delimiter:
strings.push_back(s.substr(0, last));
}
void testData() {
// Test them in the new order:
test_(strings[0] == "This");
test_(strings[1] == "is");
test_(strings[2] == "going");
test_(strings[3] == "to");
test_(strings[4] == "make");
test_(strings[5] == "sense");
test_(strings[6] == "now.");
string sentence;
for(size_t i = 0; i < strings.size() - 1; i++)
sentence += strings[i] += " ";
// Manually put last word in to avoid an extra space:
sentence += strings[strings.size() - 1];
test_(sentence == "This is going to make sense now.");
}
void run() {
parseForData();
testData();
}
};
#endif // RPARSE_H ///:~//: C03:Rparse.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
//{L} ../TestSuite/Test
#include "Rparse.h"
int main() {
RparseTest t;
t.run();
return t.report();
} ///:~字符串成员函数rFind()从后往前遍历字符串，查找并且报告与其
匹配字符 组 所在的序列排列 array 下标，若不成功报告string::npos
命令行输出
Test "class RparseTest":
Passed: 8 Failed: 0