C++ Restriction Techniques
Comprehensive Negative Number Restriction Strategies
graph TD
A[C++ Restriction Techniques] --> B[Compile-Time Restrictions]
A --> C[Runtime Validation]
A --> D[Type-Based Constraints]
A --> E[Advanced Techniques]
1. Compile-Time Restrictions
Using Static_Assert
template <typename T>
class PositiveNumber {
static_assert(std::is_arithmetic<T>::value, "Must be numeric type");
T value;
public:
explicit PositiveNumber(T val) {
if (val < 0) {
throw std::invalid_argument("Negative values not allowed");
}
value = val;
}
};
2. Runtime Validation Techniques
class InputValidator {
public:
static int getPositiveInteger() {
int input;
while (true) {
std::cout << "Enter a positive number: ";
std::cin >> input;
if (std::cin.fail()) {
std::cin.clear();
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
std::cout << "Invalid input. Try again." << std::endl;
continue;
}
if (input >= 0) return input;
std::cout << "Negative numbers are not allowed." << std::endl;
}
}
};
3. Type-Based Constraints
Using Type Traits
template <typename T>
class NonNegativeType {
static_assert(std::is_unsigned<T>::value ||
(std::is_signed<T>::value && std::is_integral<T>::value),
"Type must be unsigned or signed integral");
T value;
public:
NonNegativeType(T val) : value(val) {
if constexpr (std::is_signed<T>::value) {
if (val < 0) {
throw std::invalid_argument("Negative value not allowed");
}
}
}
};
Restriction Technique Comparison
Technique |
Complexity |
Performance |
Use Case |
Static Assert |
Low |
Compile-time |
Type Checking |
Runtime Validation |
Medium |
Runtime |
User Input |
Type Traits |
High |
Compile-time |
Advanced Typing |
4. Advanced Restriction Patterns
SFINAE-Based Restriction
template <typename T,
typename = std::enable_if_t<std::is_arithmetic_v<T> && std::is_signed_v<T>>>
class RestrictedNumber {
T value;
public:
explicit RestrictedNumber(T val) : value(val > 0 ? val : 0) {}
};
LabEx Optimization Principles
At LabEx, we focus on creating robust, efficient, and type-safe numeric restrictions that enhance code reliability and prevent runtime errors.
Best Practices
- Implement multiple validation layers
- Use compile-time checks when possible
- Provide clear error handling
- Leverage modern C++ type traits
- Balance performance with safety