bson_stream uses cmake for building tests. You can install it by running
cmake .
make install
Alternatively, you can just copy the header file (bson_stream.hh) to a location of your choosing.
Usage of this library is very similar to yaml-cpp and based on the official mongodb c++ driver. See below for some examples.
A very simple example, piping to an BSONObj and back into a double
#include "bson/bson_stream.hh"
int main() {
mongo::BSONEmitter emit;
emit << "a" << 1.0;
mongo::BSONObj obj = emit.obj();
double d;
obj["a"] >> d;
if (d==1.0)
std::cout << "Success!" << std::endl;
else
std::cout << "Wrong!" << std::endl;
return EXIT_SUCCESS;
}To overload user defined classes you only have to define two helper function:
#include "bson/bson_stream.hh"
class test {
public:
double a, b;
test() : a(1.1), b(2.1) {}
friend void operator>>( const mongo::BSONElement &el, test &t ) {
el["a"] >> t.a;
el["b"] >> t.b;
}
friend mongo::BSONEmitter &operator<<( mongo::BSONEmitter &emit, const test &t ) {
emit << "a" << t.a;
emit << "b" << t.b;
return emit;
}
};
int main() {
test t;
t.a = 1.4; t.b = -1.1;
mongo::BSONEmitter emit;
emit << t;
mongo::BSONObj obj = emit.obj();
obj >> t;
if (t.a==1.4 && t.b == -1.1)
std::cout << "Success!" << std::endl;
else
std::cout << "Wrong!" << std::endl;
// We can also add the test class as a value:
mongo::BSONEmitter emit2;
emit2 << "a" << t;
obj = emit2.obj();
obj["a"] >> t;
if (t.a==1.4 && t.b == -1.1)
std::cout << "Success!" << std::endl;
else
std::cout << "Wrong!" << std::endl;
// Or a vector of tests
mongo::BSONEmitter emit3;
std::vector<test> vt;
vt.push_back( t );
emit3 << "a" << vt;
obj = emit3.obj();
std::vector<test> vt2;
obj["a"] >> vt;
t = vt[0];
if (t.a==1.4 && t.b == -1.1)
std::cout << "Success!" << std::endl;
else
std::cout << "Wrong!" << std::endl;
return EXIT_SUCCESS;
}