To integrate a C++ namespace into a project that separates header and source files, you can follow these steps:

1. Create a header file that contains the declaration of the namespace. This header file should have a .hpp extension.

2. In the header file, use the namespace keyword followed by the name of your namespace. Then, put all the declarations (i.e. function prototypes, data types, etc.) inside the namespace.

3. Create a source file that contains the definition of the namespace. This source file should have a .cpp extension.

4. In the source file, use the namespace keyword followed by the name of your namespace. Then, define all the functions and variables declared in the header file inside the scope of the namespace.

5. In the module where you want to use the namespace, include the header file with the declarations. Then, you can use the namespace by prefixing the name of the namespace before the functions, variables, etc.

For example, if you have a namespace called MyNamespace, and you want to use a function called MyFunction, you would do the following:

// MyNamespace.hpp header file

namespace MyNamespace { void MyFunction(); }

// MyNamespace.cpp source file

include "MyNamespace.hpp"

namespace MyNamespace { void MyFunction() { // Function definition goes here } }

// SomeOtherModule.cpp

include "MyNamespace.hpp"

int main() { MyNamespace::MyFunction(); // Use the function from the namespace return 0; }