macro-use.hpp

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#pragma once    // Source encoding: UTF-8 with BOM (π is a lowercase Greek "pi").


#include <cppx-core/meta-macro/macro-apply_with_fixed_arg.hpp>

#ifndef CPPX_NO_DOLLARS_PLEASE
#   define $use_from_namespace          CPPX_USE_FROM_NAMESPACE         
#   define $use_cppx                    CPPX_USE_CPPX                   
#   define $use_std                     CPPX_USE_STD                    
#   define $use_namespace_name_in       CPPX_USE_NAMESPACE_NAME_IN      
#   define $use_cppx_namespace_name     CPPX_USE_CPPX_NAMESPACE_NAME    
#   define $use_std_namespace_name      CPPX_USE_STD_NAMESPACE_NAME     
#   define $use_namespace_names_in      CPPX_USE_NAMESPACE_NAMES_IN     
#   define $use_cppx_namespace_names    CPPX_USE_CPPX_NAMESPACE_NAMES   
#   define $use_std_namespace_names     CPPX_USE_STD_NAMESPACE_NAMES    
#endif

#define CPPX_USE_FROM_NAMESPACE( ns, ... ) \
    CPPX_APPLY_WITH_FIXED_ARG( CPPX_GENERATE_USING_DECLARATION_FOR, ns, __VA_ARGS__ ) \
    static_assert( !!"Terminate this statement with a semicolon" )

#define CPPX_GENERATE_USING_DECLARATION_FOR( ns, name ) \
    using ns::name;

#define CPPX_USE_CPPX( ... ) \
    CPPX_USE_FROM_NAMESPACE( cppx, __VA_ARGS__ )

#define CPPX_USE_STD( ... ) \
    CPPX_USE_FROM_NAMESPACE( std, __VA_ARGS__ )

#define CPPX_USE_NAMESPACE_NAME_IN( parent_ns, nested_ns ) \
    namespace nested_ns = parent_ns::nested_ns

#define CPPX_USE_CPPX_NAMESPACE_NAME( nested_ns ) \
    CPPX_USE_NAMESPACE_NAME_IN( cppx, nested_ns )

#define CPPX_USE_STD_NAMESPACE_NAME( nested_ns ) \
    CPPX_USE_NAMESPACE_NAME_IN( std, nested_ns )

#define CPPX_USE_NAMESPACE_NAMES_IN( parent_ns, ... ) \
    CPPX_APPLY_WITH_FIXED_ARG( CPPX_GENERATE_NAMESPACE_NAME_USAGE, parent_ns, __VA_ARGS__ ) \
    static_assert( !!"Terminate this statement with a semicolon" )

#define CPPX_GENERATE_NAMESPACE_NAME_USAGE( parent_ns, nested_ns ) \
    namespace nested_ns = parent_ns::nested_ns;

#define CPPX_USE_CPPX_NAMESPACE_NAMES( ... ) \
    CPPX_USE_NAMESPACE_NAMES_IN( cppx, __VA_ARGS__ )

#define CPPX_USE_STD_NAMESPACE_NAMES( ... ) \
    CPPX_USE_NAMESPACE_NAMES_IN( std, __VA_ARGS__ )