isocpp / isocpp/CppCoreGuidelines
T.100 Suggested Example
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Description
template<typename... T>
void print_all(const T& ...args) {
(output(args), ...);
}
print_all(a, 0, string{"xyz"}); // good, type-safe
printf("%d %d %s", a, 0, "xyz"); // bad, UB if %d the wrong specifier for a,
// UB if we use std::string
I think this example demonstrates nicely how variadic functions are a "just works" solution and what safety issues arise with printf by comparison.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the issue's proposed C++ variadic-template and printf example, then locate the relevant guideline section in the repository. Done means the example is added in an appropriate place and clearly demonstrates type safety and the printf undefined-behavior risks described in the issue.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100