Reading INI file using Boost Property Tree when value section does not exist

Question

I'm using Boost.PropertyTree to read INI file:

read_ini( "myIni.ini", pt );
string s=pt.get<std::string>("Section1.value1");

If section doesn't contain value1 record then Boost raises exception.

How to read INI file in an elegant way and give a default value to s in case Section1.value1 does not exist?

Answer 1

Using Boost.Optional:

s = pt.get_optional<std::string>("Section1.value1").get_value_or("default");
//     ^^^^^^^^^^^^                                     ^^^^^^^^  ^^^^^^^