' Copyright (c) Microsoft Corporation.
'
' SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

@startuml MSVC Library Block Diagram

package "Visual Studio" {

    component STL [
        <b>STL</b>
        This repo; provides C++ Standard Library headers, separately compiled
        implementations of most of the iostreams functionality, and a few runtime
        support components like std::exception_ptr.
    ]

    package VCRuntime as VCRuntimePackage {
        component VCStartup [
        <b>VCStartup</b>
        Provides compiler support mechanisms that live in each binary; such as
        machinery to call constructors and destructors for global variables, the
        entry point, and the /GS cookie.

        Merged into static and import libraries of VCRuntime.
        ]

        component VCRuntime [
        <b>VCRuntime</b>
        Provides compiler support mechanisms that can be shared between
        binaries; code that the compiler calls on your behalf, such as
        the C++ exception handling runtime, string.h intrinsics, math
        intrinsics, and declarations for CPU-vendor-specific intrinsics.
        ]

        [VCStartup] --> [VCRuntime]
    }
}

package "Windows SDK" {
    component UCRT [
        <b>Universal CRT</b>
        Windows component that provides C library support, such as printf,
        C locales, and some POSIX-like shims for the Windows API, like _stat.
    ]
}

STL --> UCRT
STL --> VCRuntimePackage
VCRuntime --> UCRT

@enduml