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// file : libbuild2/target-key.hxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef LIBBUILD2_TARGET_KEY_HXX
#define LIBBUILD2_TARGET_KEY_HXX
#include <map>
#include <cstring> // strcmp()
#include <libbutl/utility.mxx> // compare_c_string
#include <libbuild2/types.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/target-type.hxx>
#include <libbuild2/export.hxx>
namespace build2
{
// Light-weight (by being shallow-pointing) target key.
//
class target_key
{
public:
const target_type* const type;
const dir_path* const dir; // Can be relative if part of prerequisite_key.
const dir_path* const out; // Can be relative if part of prerequisite_key.
const string* const name;
mutable optional<string> ext; // Absent - unspecified, empty - none.
template <typename T>
bool is_a () const {return type->is_a<T> ();}
bool is_a (const target_type& tt) const {return type->is_a (tt);}
};
inline bool
operator== (const target_key& x, const target_key& y)
{
if (x.type != y.type ||
*x.dir != *y.dir ||
*x.out != *y.out ||
*x.name != *y.name)
return false;
// Unless fixed, unspecified and specified extensions are assumed equal.
//
const target_type& tt (*x.type);
if (tt.fixed_extension == nullptr)
return !x.ext || !y.ext || *x.ext == *y.ext;
else
{
// Note that for performance reasons here we use the specified extension
// without calling fixed_extension().
//
const char* xe (x.ext
? x.ext->c_str ()
: tt.fixed_extension (x, nullptr /* root scope */));
const char* ye (y.ext
? y.ext->c_str ()
: tt.fixed_extension (y, nullptr /* root scope */));
return strcmp (xe, ye) == 0;
}
}
inline bool
operator!= (const target_key& x, const target_key& y) {return !(x == y);}
// If the target type has a custom print function, call that. Otherwise,
// call to_stream(). Both are defined in target.cxx.
//
LIBBUILD2_SYMEXPORT ostream&
operator<< (ostream&, const target_key&);
LIBBUILD2_SYMEXPORT ostream&
to_stream (ostream&, const target_key&, optional<stream_verbosity> = nullopt);
}
namespace std
{
// Note that we ignore the extension when calculating the hash because of
// its special "unspecified" logic (see operator== above).
//
template <>
struct hash<build2::target_key>
{
using argument_type = build2::target_key;
using result_type = size_t;
size_t
operator() (const build2::target_key& k) const noexcept
{
return build2::combine_hash (
hash<const build2::target_type*> () (k.type),
hash<build2::dir_path> () (*k.dir),
hash<build2::dir_path> () (*k.out),
hash<string> () (*k.name));
}
};
}
#endif // LIBBUILD2_TARGET_KEY_HXX
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