[rand.dist.uni]

A uniform_int_distribution random number distribution produces random integers i, a ≤ i ≤ b, distributed according to the constant discrete probability function in Formula 29.2 .

\begin{matrix} P (i | a, b) = 1 / (b - a + 1) (29.2) \end{matrix}

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namespace std { template<class IntType = int> class uniform_int_distribution { public: / types using result_type = IntType; using param_type = unspecified; / constructors and reset functions uniform_int_distribution() : uniform_int_distribution(0) {} explicit uniform_int_distribution(IntType a, IntType b = numeric_limits<IntType>::max(); explicit uniform_int_distribution(const param_type& parm); void reset(); / equality operators friend bool operator=(const uniform_int_distribution& x, const uniform_int_distribution& y); / generating functions template<class URBG> result_type operator()(URBG& g); template<class URBG> result_type operator()(URBG& g, const param_type& parm); / property functions result_type a() const; result_type b() const; param_type param() const; void param(const param_type& parm); result_type min() const; result_type max() const; / inserters and extractors template<class charT, class traits> friend basic_ostream<charT, traits>& operator<(basic_ostream<charT, traits>& os, / hosted const uniform_int_distribution& x); template<class charT, class traits> friend basic_istream<charT, traits>& operator>(basic_istream<charT, traits>& is, / hosted uniform_int_distribution& x); }; }

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explicit uniform_int_distribution(IntType a, IntType b = numeric_limits<IntType>::max();

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Remarks: a and b correspond to the respective parameters of the distribution.

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result_type a() const;

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Returns: The value of the a parameter with which the object was constructed.

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result_type b() const;

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Returns: The value of the b parameter with which the object was constructed.

29.5.9.2.2 Class template uniform_real_distribution [rand.dist.uni.real]

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A uniform_real_distribution random number distribution produces random numbers x,

a \leq x < b, distributed according to the constant probability density function in Formula 29.3 .

\begin{matrix} p (x | a, b) = 1 / (b - a) (29.3) \end{matrix}

[Note 1:

This implies that p(x | a,b) is undefined when a == b.

— end note]

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namespace std { template<class RealType = double> class uniform_real_distribution { public: / types using result_type = RealType; using param_type = unspecified; / constructors and reset functions uniform_real_distribution() : uniform_real_distribution(0.0) {} explicit uniform_real_distribution(RealType a, RealType b = 1.0); explicit uniform_real_distribution(const param_type& parm); void reset(); / equality operators friend bool operator=(const uniform_real_distribution& x, const uniform_real_distribution& y); / generating functions template<class URBG> result_type operator()(URBG& g); template<class URBG> result_type operator()(URBG& g, const param_type& parm); / property functions result_type a() const; result_type b() const; param_type param() const; void param(const param_type& parm); result_type min() const; result_type max() const; / inserters and extractors template<class charT, class traits> friend basic_ostream<charT, traits>& operator<(basic_ostream<charT, traits>& os, const uniform_real_distribution& x); template<class charT, class traits> friend basic_istream<charT, traits>& operator>(basic_istream<charT, traits>& is, uniform_real_distribution& x); }; }

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explicit uniform_real_distribution(RealType a, RealType b = 1.0);

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Preconditions: a ≤ b and

b - a \leq numeric_limits<RealType>::max() .

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Remarks: a and b correspond to the respective parameters of the distribution.

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result_type a() const;

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Returns: The value of the a parameter with which the object was constructed.

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result_type b() const;

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Returns: The value of the b parameter with which the object was constructed.