options.h

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/*
    pybind11/options.h: global settings that are configurable at runtime.
 
    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
 
    All rights reserved. Use of this source code is governed by a
    BSD-style license that can be found in the LICENSE file.
*/
 
#pragma once
 
#include "detail/common.h"
 
PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
 
class options {
public:
 
    // Default RAII constructor, which leaves settings as they currently are.
    options() : previous_state(global_state()) {}
 
    // Class is non-copyable.
    options(const options&) = delete;
    options& operator=(const options&) = delete;
 
    // Destructor, which restores settings that were in effect before.
    ~options() {
        global_state() = previous_state;
    }
 
    // Setter methods (affect the global state):
 
    options& disable_user_defined_docstrings() & { global_state().show_user_defined_docstrings = false; return *this; }
 
    options& enable_user_defined_docstrings() & { global_state().show_user_defined_docstrings = true; return *this; }
 
    options& disable_function_signatures() & { global_state().show_function_signatures = false; return *this; }
 
    options& enable_function_signatures() & { global_state().show_function_signatures = true; return *this; }
 
    // Getter methods (return the global state):
 
    static bool show_user_defined_docstrings() { return global_state().show_user_defined_docstrings; }
 
    static bool show_function_signatures() { return global_state().show_function_signatures; }
 
    // This type is not meant to be allocated on the heap.
    void* operator new(size_t) = delete;
 
private:
 
    struct state {
        bool show_user_defined_docstrings = true;  //< Include user-supplied texts in docstrings.
        bool show_function_signatures = true;      //< Include auto-generated function signatures in docstrings.
    };
 
    static state &global_state() {
        static state instance;
        return instance;
    }
 
    state previous_state;
};
 
PYBIND11_NAMESPACE_END(PYBIND11_NAMESPACE)