C++ INI Parser

Yet another .ini parser for modern c++ (made for cpp17). It is a header only implementation, easy to install and simple to use.

Example

The config.ini's content is something looks like:

[section1]
any=5
 
[section2]
any_vec = 1 2 3

#include "ini/ini.h"
 
int main() {
    inih::INIReader r{"./test/fixtures/config.ini"};
 
    // Get and parse the ini value
    const auto& v1 = r.Get<std::string>("section1", "any"); // "5"
    const auto& v2 = r.Get<int>("section1", "any"); // 5
    const auto& v3 = r.Get<double>("section1", "any"); // 5.0
    const auto& v4 = r.GetVector<float>("section2", "any_vec"); // [1.0, 2.0, 3.0]
    const auto& v5 = r.GetVector<std::string>("section2", "any_vec"); // ["1", "2", "3"]
 
    // And also support writing to new ini file.
    r.InsertEntry("new_section", "key1", 5); // Create new entry
    inih::INIWriter::write("output.ini", r); // Dump ini to file
 
    return 0;
}

To learn more, please refer to test folder, it covered ALL utilities.

API

All APIs live in namespace inih. All errors are reported by throwing std::runtime_error.

INIReader

API	Description
INIReader(const std::string& filename)	Parse the given ini file; throws on missing file, syntax error (with line number) or duplicate keys
INIReader(FILE* file)	Same, but reads from an already-opened FILE* (the caller keeps ownership)
Sections()	All section names, as std::set<std::string>
Keys(section)	All key names in the given section, as std::set<std::string>
Get(section)	The whole section, as std::unordered_map<std::string, std::string>
Get<T = std::string>(section, name)	The value parsed as T; throws if section/key is missing or the value cannot be parsed
Get<T>(section, name, default_value)	Same, but returns default_value instead of throwing
GetVector<T = std::string>(section, name)	The whitespace-separated value parsed as std::vector<T>
GetVector<T>(section, name, default_vector)	Same, but returns default_vector instead of throwing
InsertEntry(section, name, value)	Add a new entry (scalar or std::vector); throws if the key already exists
UpdateEntry(section, name, value)	Overwrite an existing entry (scalar or std::vector); throws if the key does not exist

T can be std::string, bool (accepts 1/0/true/false/yes/no/on/off, case-insensitive), any integer or floating-point type, or any custom type readable from a stream with operator>>.

INIWriter

API	Description
INIWriter::write(filepath, reader, overwrite = false)	Dump an INIReader's content to a file; unless overwrite is true, throws if the file already exists

Install

Simply copy the header file ini/ini.h to your project, then done.