fix: remove unused arguments

[Becheler]

#496

Before submitting

• This PR targets the develop branch.
• I searched for an existing PR or issue covering the same change.
• My contribution is licensed under the Boost Software License 1.0.

Type of change

• Bug fix
• New feature or API addition
• Refactor (no behavior change)
• Documentation
• Build, CI, or tooling
• Other (specify below)

Does this PR introduce a breaking change?

• Yes (describe migration impact below)
• No

What this PR does

Numerous examples and test files int main( have unused arguments.

Motivation

Way too many warnings with -Wextra -Wall

Testing

Checklist

• Existing tests pass (b2 in the test/ directory).
• New behavior is covered by a test, or this is a docs / build / refactor change.
• Documentation was updated if user-facing behavior changed.
• No new compiler warnings on the platforms I built against.

[github-actions]

Boost dependency footprint vs develop (auto-generated).
PR run 32721162376 vs develop run 32719293482 (79ae35b732).

Header-inclusion weights (graph files pulling each direct dependency in):

No header-inclusion-weight changes.

Transitive Boost modules: 66 → 66 (0)

[github-actions]

Compiler-warning counts vs develop (auto-generated).
PR run 32721162330 vs develop run 32719293488 (79ae35b732).

Job	Baseline	After	Delta
macos (clang, 14)	682	607	-75
macos (clang, 17)	645	570	-75
macos (clang, 20)	645	570	-75
ubuntu (clang-19, 14)	682	607	-75
ubuntu (clang-19, 17)	645	570	-75
ubuntu (clang-19, 20)	645	570	-75
ubuntu (clang-19, 23)	645	570	-75
ubuntu (gcc-14, 14)	843	768	-75
ubuntu (gcc-14, 17)	979	904	-75
ubuntu (gcc-14, 20)	979	904	-75
ubuntu (gcc-14, 23)	979	904	-75
windows_msvc_14_3 (msvc-14.3)	938	938	0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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