src/kernel/trace.h

/*
Copyright (c) 2015 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.

Author: Leonardo de Moura
*/
#pragma once
#include <memory>
#include <string>
#include "library/elab_environment.h"
#include "util/options.h"

namespace lean {
void register_trace_class(name const & n, name const & decl_name = {});
bool is_trace_class_enabled(name const & n);

class scope_trace_env {
    options     const *      m_old_opts;
    void init(elab_environment * env, options * opts);
public:
    scope_trace_env(elab_environment const & env, options const & opts);
    ~scope_trace_env();
};

struct tclass { name m_cls; tclass(name const & c):m_cls(c) {} };

struct tout {
    sstream m_out;
    ~tout();
};

template <typename T>
tout & operator<<(tout const & out, T const & t) {
    tout & out_mut = const_cast<tout &>(out);
    out_mut.m_out << t;
    return out_mut;
}

std::ostream & operator<<(std::ostream & ios, tclass const &);

#define lean_trace(CName, CODE) {               \
if (lean::is_trace_class_enabled(CName)) {      \
    tout() << tclass(CName); CODE               \
}}

void initialize_trace();
void finalize_trace();
}