The MPL Reference Manual: min

min

template<
      typename N1
    , typename N2
    >
struct min
{
    typedef unspecified type;
};

Returns the smaller of its two arguments.

#include <boost/mpl/min_max.hpp>

Parameter	Requirement	Description
`N1`, `N2`	Any type	Types to compare.

For arbitrary types x and y:

typedef min::type r;

Return type:

Return type:	A type.
Precondition:	`less::value` is a well-formed integral constant expression.
Semantics:	Equivalent to typedef if_< less,x,y >::type r;

A type.

Precondition:

less::value is a well-formed integral constant expression.

Semantics:

Equivalent to

typedef if_< less,x,y >::type r;

Constant time.

typedef fold<
      vector_c
    , int_<-10>
    , min<_1,_2>
    >::type r;

BOOST_MPL_ASSERT(( is_same< r, int_<-10> > ));

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