C++ Boost 2 容器
在线文档:http://www.boost.org/doc/
离线文档:解压Boost压缩包,浏览boost_1_62_0/boost_1_62_0/libs/libraries.htm#Containers
目录: Boost any 容器 引用与指针复习,引用并不会退化 boost.tuple,类似STL的pair键值对,但是tuple可以装10种不同的任意数据类型 tuple的创建,值操作要注意的 tuple.tie:创建一个所有元素类型为非const引用的tuple tuple IO设定输出格式,只接受固定格式的输入 Boost.array Boost.unordered 无序数据插入 Boost,unordered hash_map桶的分布情况 Boost:Multi-Array 多维数组 Boost 多维数组, Boost.Property Map Key,value Property Tree 解析XML文件 Property Tree 生成XML文件 Property Tree 解析JSON文件 Property Tree 生成JSON文件
Boost any 容器
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <list>
#include <boost/any.hpp>
using boost::any_cast;
typedef std::list<boost::any> many;
void append_int(many & values, int value)
{
boost::any to_append = value;
values.push_back(to_append);
}
void append_string(many & values, const std::string & value)
{
values.push_back(value);
}
void append_char_ptr(many & values, const char * value)
{
values.push_back(value);
}
void append_any(many & values, const boost::any & value)
{
values.push_back(value);
}
void append_nothing(many & values)
{
values.push_back(boost::any());
}
bool is_empty(const boost::any & operand)
{
return operand.empty();
}
bool is_int(const boost::any & operand)
{
return operand.type() == typeid(int);
}
bool is_char_ptr(const boost::any & operand)
{
try
{
any_cast<const char *>(operand);
return true;
}
catch(const boost::bad_any_cast &)
{
return false;
}
}
bool is_string(const boost::any & operand)
{
return any_cast<std::string>(&operand);
}
void count_all(many & values, std::ostream & out)
{
out << "#empty == " << std::count_if(values.begin(), values.end(), is_empty) << std::endl;
out << "#int == " << std::count_if(values.begin(), values.end(), is_int) << std::endl;
out << "#const char * == " << std::count_if(values.begin(), values.end(), is_char_ptr) << std::endl;
out << "#string == " << std::count_if(values.begin(), values.end(), is_string) << std::endl;
}
int main()
{
many m1;
append_int(m1,128);
append_int(m1,65535);
append_char_ptr(m1,"Hello");
append_string(m1,"Hello");
append_nothing(m1);
count_all(m1,std::cout);
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
#empty == 1
#int == 2
#const char * == 1
#string == 1
chunli@Linux:~/boost$
引用与指针复习,引用并不会退化
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
void fun1(int (&a)[20])
{
std::cout << sizeof(a) << std::endl;
std::cout << a[0] << std::endl;
std::cout << a[1] << std::endl;
}
void fun2(int *a)
{
std::cout << a[0] << std::endl;
std::cout << a[1] << std::endl;
}
int main()
{
int a[20];
a[0] = 1;
a[1] = 111;
fun1(a);
fun2(a);
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
80
1
111
1
111
chunli@Linux:~/boost$
boost.tuple,类似STL的pair键值对,但是tuple可以装10种不同的任意数据类型
tuple的创建,值操作要注意的
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/tuple/tuple.hpp>
class A{};
int main()
{
using boost::tuple;
double d = 2.7;
A a;
tuple<int,double&,const A&> t(1,d,a); //创建tuple对象
++boost::get<0>(t);
int i = boost::get<0>(t);
i = t.get<0>();
boost::get<0>(t) = 5;
A aa = boost::get<2>(t); //接收对象
//A aa = boost::get<3>(t); //下标溢出
double e = boost::get<1>(t); //数据类型自动转换
boost::get<1>(t) = 3.14; //修改值
//boost::get<2>(t) = "hello"; //数据类型不匹配
const tuple<int,double&,const A&> ct = t;//创建tuple对象
int j = boost::get<0>(ct);
//boost::get<0>(ct) = 5;//无法修改 const数据类型
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp && ./a.out
chunli@Linux:~/boost$
tuple.tie:创建一个所有元素类型为非const引用的tuple
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/tuple/tuple.hpp>
int main()
{
int i;
char c;
double d;
boost::tie(i,c,d); //通过boost::tuple 来修改
boost::tie(i,c,d) = boost::tuple<int,char,double>(1,'A',3.1415926);
std::cout<<i<<std::endl;
std::cout<<c<<std::endl;
std::cout<<d<<std::endl;
char e;
boost::tie(boost::tuples::ignore,e) = std::make_pair(1,'a');//ignore
std::cout<<e<<std::endl;
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
1
A
3.14159
a
chunli@Linux:~/boost$
tuple IO设定输出格式,只接受固定格式的输入
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/tuple/tuple_io.hpp>
using namespace std;
int main()
{
//输出
//默认输出 (1 602214129 Hello Boost!)
boost::tuple<float,int,string> a(1.0f,602214129,string("Hello Boost!"));
cout << a << endl;
//自定义输出格式 [1,602214129,Hello Boost!]
boost::tuple<float,int,string> b(1.0f,602214129,string("Hello Boost!"));
cout << boost::tuples::set_open('[') << boost::tuples::set_close(']')
<< boost::tuples::set_delimiter(',') << b << endl;
//输入
boost::tuple<int,int,int> i;
cin >>i ;
cout << i <<endl;
boost::tuple<int,int> j;
cin >> boost::tuples::set_open('[') >> boost::tuples::set_close(']')
>> boost::tuples::set_delimiter(':');
cin >> j;
cout << j << endl;
return 0;
}
chunli@Linux:~/boost$
chunli@Linux:~/boost$ g++ main.cpp && ./a.out
(1 602214129 Hello Boost!)
[1,602214129,Hello Boost!]
(123 321 213)
[123,321,213]
[123:321]
[123,321]
chunli@Linux:~/boost$ g++ main.cpp && ./a.out
(1 602214129 Hello Boost!)
[1,602214129,Hello Boost!]
234 567 890
[0,0,0]
[0,0]
chunli@Linux:~/boost$
Boost.array
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <algorithm>
#include <boost/array.hpp>
using namespace std;
int main()
{
//boost::array<int,10> arr1 = {9,1,8,2,7,3,6,4,0,5};//创建一个装int类型,容量是10个
boost::array<int,10> arr1 = {{9,1,8,2,7,3,6,4,0,5}};//创建一个装int类型,容量是10个
sort(arr1.begin(),arr1.end());
copy(arr1.begin(),arr1.end(),ostream_iterator<int>(cout," "));
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
0 1 2 3 4 5 6 7 8 9 chunli@Linux:~/boost$
Boost.unordered 数据插入
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/unordered_map.hpp>
using namespace std;
template<typename Iter>
void print(Iter first,Iter last)
{
while(first != last)
{
cout << first->first << "," << first->second << endl;
first++;
}
}
int main()
{
boost::unordered_map<string,int> map1;
map1.insert(make_pair("Hello Boost",11));
map1.insert(make_pair("Hello World",12));
map1.insert(make_pair("Hello Linux",13));
map1.insert(make_pair("Hello C++",14));
map1["apple"] = 666;
map1["banana"] = 777;
map1["pare"] = 888;
//map1["X2"],对map下标操作,如果key不存在,就插入.尽量少用这种费解的语法
cout << map1["对map下标操作,如果key不存在,就插入"] << endl;//打印 0
print(map1.begin(),map1.end());
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
0
pare,888
banana,777
对map下标操作,如果key不存在,就插入,0
apple,666
Hello C++,14
Hello Linux,13
Hello World,12
Hello Boost,11
chunli@Linux:~/boost$
Boost,unordered hash_map桶的分布情况
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/unordered_map.hpp>
using namespace std;
template<typename Iter>
void print(Iter first,Iter last)
{
while(first != last)
{
cout << first->first << "," << first->second << endl;
first++;
}
}
int main()
{
boost::unordered_map<string,int> map1;
map1.insert(make_pair("Hello Boost",11));
map1.insert(make_pair("Hello World",12));
map1.insert(make_pair("Hello Linux",13));
map1.insert(make_pair("Hello C++",14));
map1["apple"] = 666;
map1["banana"] = 777;
map1["pare"] = 888;
//map1["X2"],对map下标操作,如果key不存在,就插入.尽量少用这种费解的语法
cout << map1["对map下标操作,如果key不存在,就插入"] << endl;//打印 0
print(map1.begin(),map1.end());
/////////////////// 查看有多少个元素/////////////////////////////
cout << "map1 size:"<<map1.size() << endl;//map1 size:3
/////////////////// 查看有多少个桶/////////////////////////////
cout << "当前共有" << map1.bucket_count() << "个桶" << endl;
/////////////////// 查看每个桶的分布情况/////////////////////////////
cout << "每个桶的情况如下" << endl;
int n = map1.bucket_count();
for(int i = 0;i<n;i++)
{
cout << "Bucket #" <<i <<":" << map1.bucket_size(i) << endl;
}
cout << "-------------------------------------------"<< endl;
typedef boost::unordered_map<string,int>::local_iterator LIter;
for(LIter it = map1.begin(0);it != map1.end(0);++it)
{
cout << it->first << " " <<it->second << endl;
}
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
0
pare,888
banana,777
对map下标操作,如果key不存在,就插入,0
apple,666
Hello C++,14
Hello Linux,13
Hello World,12
Hello Boost,11
map1 size:8
当前共有16个桶
每个桶的情况如下
Bucket #0:2
Bucket #1:0
Bucket #2:0
Bucket #3:0
Bucket #4:0
Bucket #5:0
Bucket #6:1
Bucket #7:1
Bucket #8:1
Bucket #9:2
Bucket #10:0
Bucket #11:1
Bucket #12:0
Bucket #13:0
Bucket #14:0
Bucket #15:0
-------------------------------------------
Hello Linux 13
Hello World 12
chunli@Linux:~/boost$
Boost:Multi-Array 多维数组
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include "boost/multi_array.hpp"
#include "boost/cstdlib.hpp"
using namespace std;
int main () {
// Create a 3D array that is 3 x 4 x 2
typedef boost::multi_array<double, 3> array;
array A(boost::extents[3][4][2]);
// Assign a value to an element in the array
A[0][0][0] = 3.14;
if(A[0][0][0] == 3.14)
{
cout << "yes!" << endl;
}
else
{
cout << "no!" << endl;
}
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
yes!
chunli@Linux:~/boost$
Boost 多维数组,
chunli@Linux:~/boost$ cat main.cpp
#include <stdio.h>
#include "boost/multi_array.hpp"
#include "boost/array.hpp"
#include "boost/cstdlib.hpp"
using namespace std;
int main ()
{
boost::array<int, 3> shape = {{ 5, 5, 5 }};//普通数组 ,装3个数据
boost::multi_array<int, 3> A(shape); //设定3个维度的大小
/////////////填充////////////////////////
for(int i=0;i<5;i++)
{
for(int j=0;j<5;j++)
{
for(int k=0;k<5;k++)
{
A[i][j][k] = (i+j+k)*(i+j+k);
}
}
}
////////////遍历/////////////////////////////
for(int i=0;i<5;i++)
{
for(int j=0;j<5;j++)
{
for(int k=0;k<5;k++)
{
printf("A[%d][%d][%d]=%3d,",i,j,k,A[i][j][k]);
}
printf("\n");
}
printf("\n");
}
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp && ./a.out
A[0][0][0]= 0,A[0][0][1]= 1,A[0][0][2]= 4,A[0][0][3]= 9,A[0][0][4]= 16,
A[0][1][0]= 1,A[0][1][1]= 4,A[0][1][2]= 9,A[0][1][3]= 16,A[0][1][4]= 25,
A[0][2][0]= 4,A[0][2][1]= 9,A[0][2][2]= 16,A[0][2][3]= 25,A[0][2][4]= 36,
A[0][3][0]= 9,A[0][3][1]= 16,A[0][3][2]= 25,A[0][3][3]= 36,A[0][3][4]= 49,
A[0][4][0]= 16,A[0][4][1]= 25,A[0][4][2]= 36,A[0][4][3]= 49,A[0][4][4]= 64,
A[1][0][0]= 1,A[1][0][1]= 4,A[1][0][2]= 9,A[1][0][3]= 16,A[1][0][4]= 25,
A[1][1][0]= 4,A[1][1][1]= 9,A[1][1][2]= 16,A[1][1][3]= 25,A[1][1][4]= 36,
A[1][2][0]= 9,A[1][2][1]= 16,A[1][2][2]= 25,A[1][2][3]= 36,A[1][2][4]= 49,
A[1][3][0]= 16,A[1][3][1]= 25,A[1][3][2]= 36,A[1][3][3]= 49,A[1][3][4]= 64,
A[1][4][0]= 25,A[1][4][1]= 36,A[1][4][2]= 49,A[1][4][3]= 64,A[1][4][4]= 81,
A[2][0][0]= 4,A[2][0][1]= 9,A[2][0][2]= 16,A[2][0][3]= 25,A[2][0][4]= 36,
A[2][1][0]= 9,A[2][1][1]= 16,A[2][1][2]= 25,A[2][1][3]= 36,A[2][1][4]= 49,
A[2][2][0]= 16,A[2][2][1]= 25,A[2][2][2]= 36,A[2][2][3]= 49,A[2][2][4]= 64,
A[2][3][0]= 25,A[2][3][1]= 36,A[2][3][2]= 49,A[2][3][3]= 64,A[2][3][4]= 81,
A[2][4][0]= 36,A[2][4][1]= 49,A[2][4][2]= 64,A[2][4][3]= 81,A[2][4][4]=100,
A[3][0][0]= 9,A[3][0][1]= 16,A[3][0][2]= 25,A[3][0][3]= 36,A[3][0][4]= 49,
A[3][1][0]= 16,A[3][1][1]= 25,A[3][1][2]= 36,A[3][1][3]= 49,A[3][1][4]= 64,
A[3][2][0]= 25,A[3][2][1]= 36,A[3][2][2]= 49,A[3][2][3]= 64,A[3][2][4]= 81,
A[3][3][0]= 36,A[3][3][1]= 49,A[3][3][2]= 64,A[3][3][3]= 81,A[3][3][4]=100,
A[3][4][0]= 49,A[3][4][1]= 64,A[3][4][2]= 81,A[3][4][3]=100,A[3][4][4]=121,
A[4][0][0]= 16,A[4][0][1]= 25,A[4][0][2]= 36,A[4][0][3]= 49,A[4][0][4]= 64,
A[4][1][0]= 25,A[4][1][1]= 36,A[4][1][2]= 49,A[4][1][3]= 64,A[4][1][4]= 81,
A[4][2][0]= 36,A[4][2][1]= 49,A[4][2][2]= 64,A[4][2][3]= 81,A[4][2][4]=100,
A[4][3][0]= 49,A[4][3][1]= 64,A[4][3][2]= 81,A[4][3][3]=100,A[4][3][4]=121,
A[4][4][0]= 64,A[4][4][1]= 81,A[4][4][2]=100,A[4][4][3]=121,A[4][4][4]=144,
chunli@Linux:~/boost$
Boost.Property Map
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <map>
#include <string>
#include <boost/property_map/property_map.hpp>
template <typename AddressMap>
void foo(AddressMap address)
{
std::cout << "foo: "<< sizeof(address) << std::endl;
typedef typename boost::property_traits<AddressMap>::key_type key_type;
typedef typename boost::property_traits<AddressMap>::value_type value_type;
value_type old_address, new_address;
key_type fred = "Fred";
old_address = get(address, fred);
new_address = "384 Fitzpatrick Street";
put(address, fred, new_address);
key_type joe = "工程师";
value_type& joes_address = address[joe];
joes_address = "西湖 中国浙江";
}
int main()
{
std::map<std::string, std::string> name2address;
boost::associative_property_map < std::map<std::string, std::string> > address_map(name2address);
std::cout << "std::map<std::string, std::string> :" << sizeof(name2address) << std::endl;
name2address.insert(make_pair(std::string("Fred"),std::string("710 West 13th Street")));
name2address.insert(make_pair(std::string("Joe"), std::string("710 West 13th Street")));
std::cout << "std::map<std::string, std::string> :" << sizeof(name2address) << std::endl;
foo(address_map);
for (std::map<std::string, std::string>::iterator i = name2address.begin();i != name2address.end(); i++)
{
std::cout << i->first << ": " << i->second << std::endl;
}
return EXIT_SUCCESS;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
std::map<std::string, std::string> :48
std::map<std::string, std::string> :48
foo: 8
Fred: 384 Fitzpatrick Street
Joe: 710 West 13th Street
工程师: 西湖 中国浙江
chunli@Linux:~/boost$
Property Tree 解析XML文件
chunli@Linux:~/boost$ cat debug_persons.xml
<debug>
<total>3</total>
<persons>
<person>
<age>23</age>
<name>hugo</name>
</person>
<person>
<age>23</age>
<name>mayer</name>
</person>
<person>
<age>30</age>
<name>boy</name>
</person>
</persons>
</debug>
chunli@Linux:~/boost$
chunli@Linux:~/boost$ cat main.cpp
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/foreach.hpp>
#include <vector>
#include <string>
#include <exception>
#include <iostream>
struct person
{
int age;
std::string name;
};
struct debug_persons
{
int itsTotalNumber;
std::vector<person> itsPersons;
void load(const std::string& filename);
void save(const std::string& filename);
};
std::ostream& operator<<(std::ostream& o,const debug_persons& dp)
{
o << "totoal:" << dp.itsTotalNumber << "\n";
o << "persons\n";
BOOST_FOREACH(const person& p,dp.itsPersons)
{
o << "\tperson: Age:" << p.age << " Nmae:" << p.name << "\n";
}
return o;
}
void debug_persons::save( const std::string& filename )
{
using boost::property_tree::ptree;
ptree pt;
pt.put("debug.total", itsTotalNumber);
BOOST_FOREACH(const person& p,itsPersons)
{
ptree child;
child.put("age",p.age);
child.put("name",p.name);
pt.add_child("debug.persons.person",child);
}
// Write property tree to XML file
write_xml(filename, pt);
}
void debug_persons::load( const std::string& filename )
{
using boost::property_tree::ptree;
ptree pt;
read_xml(filename, pt);
itsTotalNumber = pt.get<int>("debug.total");
BOOST_FOREACH(ptree::value_type &v, pt.get_child("debug.persons"))
{
//m_modules.insert(v.second.data());
person p;
p.age = v.second.get<int>("age");
p.name = v.second.get<std::string>("name");
itsPersons.push_back(p);
}
}
int main(int argc, char* argv[])
{
try
{
debug_persons dp;
dp.load("debug_persons.xml");
std::cout<<dp<<std::endl;
person p;
p.age = 100;
p.name = "old man";
dp.itsPersons.push_back(p);
dp.save("new.xml");
std::cout << "Success\n";
}
catch (std::exception &e)
{
std::cout << "Error: " << e.what() << "\n";
}
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
totoal:3
persons
person: Age:23 Nmae:hugo
person: Age:23 Nmae:mayer
person: Age:30 Nmae:boy
Success
chunli@Linux:~/boost$
Property Tree 生成XML文件
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
#include <boost/foreach.hpp>
#include <string>
#include <vector>
using namespace std;
int main(int argc, char** argv)
{
vector<string> vect_str;
vector<string>::iterator it;
vect_str.push_back("111111");
vect_str.push_back("222222");
vect_str.push_back("333333");
vect_str.push_back("444444");
using namespace boost::property_tree;
ptree pt; //定义一个树pt
ptree out;
ptree cond;
ptree rule;
ptree data ;
ptree info ;
for (it = vect_str.begin(); it != vect_str.end(); it++) //迭代vector
{
data.put("<xmlattr>.key",it->data());
info.add_child("data",data);
data.clear() ;
}
pt.add_child("root.output.info",info);
info.clear();
BOOST_FOREACH(std::string& str, vect_str) //迭代vector
{
for (int i = 0; i < 2; i++)
{
cond.put("<xmlattr>.desc", "123");
cond.put("<xmlattr>.path", "345");
cond.put("<xmlattr>.version", "567");
cond.put("<xmlattr>.priority", "789");
rule.add_child("cond", cond);
cond.clear();
}
out.put("<xmlattr>.where", str);
rule.add_child("out",out);
out.clear();
pt.add_child("root.output.rule", rule);
rule.clear();
}
//设置写入xml文件的格式，
boost::property_tree::xml_writer_settings<string> settings = boost::property_tree::xml_writer_make_settings<string> (' ', 4);
//把property_tree 转为XML文件
write_xml("newconfig.xml", pt, std::locale(), settings);
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
chunli@Linux:~/boost$ cat newconfig.xml
<?xml version="1.0" encoding="utf-8"?>
<root>
<output>
<info>
<data key="111111"/>
<data key="222222"/>
<data key="333333"/>
<data key="444444"/>
</info>
<rule>
<cond desc="123" path="345" version="567" priority="789"/>
<cond desc="123" path="345" version="567" priority="789"/>
<out where="111111"/>
</rule>
<rule>
<cond desc="123" path="345" version="567" priority="789"/>
<cond desc="123" path="345" version="567" priority="789"/>
<out where="222222"/>
</rule>
<rule>
<cond desc="123" path="345" version="567" priority="789"/>
<cond desc="123" path="345" version="567" priority="789"/>
<out where="333333"/>
</rule>
<rule>
<cond desc="123" path="345" version="567" priority="789"/>
<cond desc="123" path="345" version="567" priority="789"/>
<out where="444444"/>
</rule>
</output>
</root>
chunli@Linux:~/boost$
Property Tree 解析JSON文件
chunli@Linux:~/boost$ cat test.json
{
"rate":{
"linktype":[0.8, 1.0, 1.0, 0.7, 0.4, 0.7, 0.8, 0.8, 0.9, 0.9, 0.4, 0.8, 1.0],
"width":[[0.6, 0.8],
[0.7, 0.87],
[1.0, 1.2],
[1.2, 1.4],
[1.0, 1.0]],
"use_toll":[0.33, 1.2]
},
"turn_cost":{
"uturn":{
"Hturn":0,
"triangle":1200,
"normal":[1200, 300, 60, 5]
}
}
}
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
using namespace std;
int main()
{
boost::property_tree::ptree pt;
boost::property_tree::json_parser::read_json("test.json", pt);
boost::property_tree::ptree child_linktype = pt.get_child("rate.linktype");
BOOST_FOREACH(boost::property_tree::ptree::value_type &vt, child_linktype)
{
cout << vt.second.get_value<double>() << " ";
}
cout << endl;
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
0.8 1 1 0.7 0.4 0.7 0.8 0.8 0.9 0.9 0.4 0.8 1
chunli@Linux:~/boost$
Property Tree 生成JSON文件
chunli@Linux:~/boost$ cat main.cpp
#include <iostream>
#include <string>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
using namespace std;
using namespace boost::property_tree;
int main(){
ptree pt_1,pt_11,pt_12;
pt_11.put("id","3445");
pt_11.put<int>("age",29);
pt_11.put("name","chen");
pt_12.push_back(make_pair("",pt_11));
pt_12.push_back(make_pair("",pt_11));
//replace or create child node "data"
pt_1.put_child("data",pt_12);
ostringstream os;
write_json(os,pt_1);
cout<<os.str()<<endl;
return 0;
}
chunli@Linux:~/boost$ g++ main.cpp -Wall && ./a.out
{
"data": [
{
"id": "3445",
"age": "29",
"name": "chen"
},
{
"id": "3445",
"age": "29",
"name": "chen"
}
]
}
chunli@Linux:~/boost$
