Boost库初试

实际上是一个例子，可是编译的时候没有通过。
很简单的一个问题:
#include 
#include 
int main()
{
        using boost::lexical_cast;
        int a = lexical_cast("123");
        double b = lexical_cast("123.12");
        std::cout<        std::cout<        return 0;
}

wangyao@fisherman:~/temp/boost$ g++ stoi.cpp
stoi.cpp: In function ‘int main()’:
stoi.cpp:7: error: ‘boost::lexical’ has not been declared
stoi.cpp:9: error: ‘lexical_cast’ was not declared in this scope
stoi.cpp:9: error: expected primary-expression before ‘int’
stoi.cpp:9: error: expected ‘,’ or ‘;’ before ‘int’
stoi.cpp:10: error: expected primary-expression before ‘double’
stoi.cpp:10: error: expected ‘,’ or ‘;’ before ‘double’

可以判断是名字空间的问题，改呗~~~

#include 
#include 
using namespace boost;
using namespace std;

int main()
{
        int a = lexical_cast("123");
        double b = lexical_cast("123.12");
        cout<         cout<         return 0;
}

再进行编译，OK~