Coding style in PoDoFo follows the following general rules:

Visual Studio formatting conventions (see for example C# conventions), where they apply to C/C++ like constructs;
Capitalized case for public MethodNames(), or private/protected methods names intended to be called outside the boundary of the current class through inheritance or class/method friendship (eg. ProtectedMethod(), FriendMethod());
Lower case for private/virtual protected methods intended to be called only within the current class, eg. initOperation(). It may be common to have a public outer method MyMethod() that performs some validations first and subsequently calls a private or virtual protected inner method myMethod() that actually performs the task;
Camel case for variables, parameters and fields (example variableName).

Some language specific programming stylistic choices will be hard enforced, namely:

C style programming (malloc/free, string formatting, etc.) shall be converted to equivalent modern C++ constructs/API calls, unless there's still no other modern C++ alternative (eg. scanf). Where possible new/delete semantics shall be replaced by use of smart pointers;
m_ and s_ prefixes shall be used respectively for instance member and static fields/variables. For example m_Value or s_instance. No other Hungarian notation prefixes will be accepted;
Implicit conversion from pointer types to bool (eg. if (!ptr) or while (ptr) conditionals) shall be converted to check for nullptr, eg. if (ptr == nullptr) or while (ptr != nullptr);
Increment/decrement operators shall always be postfixed in epxressions as in it++, unless the prefixed operator is necessary for the correctness of an algorithm or allows to shorten/optimize the code.

It follows other lenient rules that are not truly enforced in all the code base, but that it is still recommended to follow:

Lower case field names for private fields used only in this class boundary, for example m_privateField;
Capitalized field names for private fields exposed by public getters/setters, example m_Value.

PoDoFo specifics

PdfDictionary and other methods doing lookups on PdfName with keys known at compile time: GetKey, FindKey, FindKeyHas, HasKey, RemoveKey methods (and in general non addition lookup methods) use string literals or string_view. For AddKey, AddKeyIndirect, AddKeyIndirectSafe use the "_n" user literal
std::string_view are always passed by const reference in the public API

Some examples of expected coding style can be found at the following permalinks: