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std::min - cppreference.com

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Definido no cabeçalho

<algorithm>

template< class T > const T& min( const T& a, const T& b );

 (1)

template< class T, class Compare > const T& min( const T& a, const T& b, Compare comp );

 (2)

template< class T > T min( std::initializer_list<T> ilist);

 (3) (desde C++11)

template< class T, class Compare > T min( std::initializer_list<T> ilist, Compare comp );

 (4) (desde C++11)

1-2)

Retorna o menor dos dois valores.

Original:

Returns the smaller of the two values.

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3-4)

Retorna o menor dos valores na lista de inicializador ilist.

Original:

Returns the smallest of the values in initializer list ilist.

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As versões (1,3) usar operator< para comparar os valores, as versões (2,4) usar a função de comparação dada comp.

Original:

The (1,3) versions use operator< to compare the values, the (2,4) versions use the given comparison function comp.

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Parâmetros

a, b -

os valores para comparar

Original:

the values to compare

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ilist -

inicializador lista com os valores para comparar

Original:

initializer list with the values to compare

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cmp - comparison function which returns ​true if if a is less than b.

The signature of the comparison function should be equivalent to the following:

bool cmp(const Type1 &a, const Type2 &b);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The types Type1 and Type2 must be such that an object of type T can be implicitly converted to both of them. ​

Type requirements
-T must meet the requirements of LessThanComparable. for the overloads (1) and (3)
-T must meet the requirements of CopyConstructible. for the overloads (3) and (4)

Valor de retorno

1-2)

O menor dos a e b. Se os valores são equivalentes, os retornos a.

Original:

The smaller of a and b. If the values are equivalent, returns a.

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3-4)

O menor valor em ilist. Se vários valores são equivalentes ao menor, retorna o valor mais à esquerda tal.

Original:

The smallest value in ilist. If several values are equivalent to the smallest, returns the leftmost such value.

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Complexidade

1-2)

Constante

Original:

Constant

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3-4)

Linear em ilist.size()

Original:

Linear in ilist.size()

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Possível implementação

First version 
template<class T> 
const T& min(const T& a, const T& b)
{
    return (a < b) ? a : b;
}
Second version 
template<class T, class Compare> 
const T& min(const T& a, const T& b, Compare comp)
{
    return (comp(a, b)) ? a : b;
}
Third version 
template<class T>
T min( std::initializer_list<T> ilist)
{
    return *std::min_element(ilist.begin(), ilist.end());
}
Fourth version 
template<class T, class Compare>
T min(std::initializer_list<T> ilist, Compare comp)
{
    return *std::min_element(ilist.begin(), ilist.end(), comp);
}

Exemplo

#include <algorithm>
#include <iostream>
 
int main()
{
    std::cout << "smaller of 1 and 9999: " << std::min(1, 9999) << '\n';
    std::cout << "smaller of 'a' and 'b': " << std::min('a', 'b') << '\n';
    std::cout << "smaller of 3.5 and 2.5: " << std::min(3.5, 2.5) << '\n';
}

Saída: 

smaller of 1 and 9999: 1
smaller of 'a' and 'b': a
smaller of 3.5 and 2.5: 2.5

Veja também

devolve o maior dos dois elementos

Original:

returns the larger of two elements

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(modelo de função) [edit]

(C++11)

retorna o. maior e o menor dos dois elementos

Original:

returns the larger and the smaller of two elements

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(modelo de função) [edit]

retorna o elemento mais pequeno de um intervalo

Original:

returns the smallest element in a range

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(modelo de função) [edit]