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added default consturctors to placeholders (back)

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[SVN r13238]
This commit is contained in:
Jaakko Järvi
2002-03-21 22:45:48 +00:00
parent 1879db42b6
commit eac09d219b
1 changed files with 7 additions and 0 deletions
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7
include/boost/lambda/detail/lambda_functors.hpp
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@@ -112,12 +112,15 @@ typedef const lambda_functor<placeholder<THIRD> > placeholder3_type;
template <int I>
class lambda_functor<placeholder<I> > {
public:
lambda_functor() {}
BOOST_LAMBDA_LAMBDA_FUNCTOR_ASSIGNMENT
BOOST_LAMBDA_LAMBDA_FUNCTOR_SUBSCRIPT
};
template<>
class lambda_functor<placeholder<FIRST> > {
public:
lambda_functor() {}
template <class A>
A& operator()(A& a) const { return a; }
@@ -125,8 +128,10 @@ BOOST_LAMBDA_LAMBDA_FUNCTOR_ASSIGNMENT
BOOST_LAMBDA_LAMBDA_FUNCTOR_SUBSCRIPT
};
template<>
class lambda_functor<placeholder<SECOND> > {
public:
lambda_functor() {}
template <class A, class B>
B& operator()(A&, B& b) const { return b; }
@@ -139,8 +144,10 @@ BOOST_LAMBDA_LAMBDA_FUNCTOR_ASSIGNMENT
BOOST_LAMBDA_LAMBDA_FUNCTOR_SUBSCRIPT
};
template<>
class lambda_functor<placeholder<THIRD> > {
public:
lambda_functor() {}
template <class A, class B, class C>
C& operator()(A&, B&, C& c) const { return c; }