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MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/blob/main/LICENSE.txt) [![GitHub release (latest by date)](https://img.shields.io/github/v/release/nfx-libs/nfx-stringbuilder?style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/releases) [![GitHub tag (latest by date)](https://img.shields.io/github/tag/nfx-libs/nfx-stringbuilder?style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/tags)\u003cbr/\u003e\n\n![C++20](https://img.shields.io/badge/C%2B%2B-20-blue?style=flat-square) ![CMake](https://img.shields.io/badge/CMake-3.20%2B-green.svg?style=flat-square) ![Cross Platform](https://img.shields.io/badge/Platform-Linux_Windows-lightgrey?style=flat-square)\n\n\u003c!-- CI/CD Status --\u003e\n\n[![Linux GCC](https://img.shields.io/github/actions/workflow/status/nfx-libs/nfx-stringbuilder/build-linux-gcc.yml?branch=main\u0026label=Linux%20GCC\u0026style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/actions/workflows/build-linux-gcc.yml) [![Linux Clang](https://img.shields.io/github/actions/workflow/status/nfx-libs/nfx-stringbuilder/build-linux-clang.yml?branch=main\u0026label=Linux%20Clang\u0026style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/actions/workflows/build-linux-clang.yml) [![Windows MinGW](https://img.shields.io/github/actions/workflow/status/nfx-libs/nfx-stringbuilder/build-windows-mingw.yml?branch=main\u0026label=Windows%20MinGW\u0026style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/actions/workflows/build-windows-mingw.yml) [![Windows MSVC](https://img.shields.io/github/actions/workflow/status/nfx-libs/nfx-stringbuilder/build-windows-msvc.yml?branch=main\u0026label=Windows%20MSVC\u0026style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/actions/workflows/build-windows-msvc.yml) [![CodeQL](https://img.shields.io/github/actions/workflow/status/nfx-libs/nfx-stringbuilder/codeql.yml?branch=main\u0026label=CodeQL\u0026style=flat-square)](https://github.com/nfx-libs/nfx-stringbuilder/actions/workflows/codeql.yml)\n\n\u003e A cross-platform C++20 high-performance string builder with Small Buffer Optimization and efficient memory management\n\n## Overview\n\n**nfx-stringbuilder** is a modern C++20 library providing efficient string building capabilities with zero heap allocations for small strings (≤256 bytes). Designed for applications requiring high-performance string concatenation with minimal allocations, it features Small Buffer Optimization (SBO), comprehensive type support, and C++20 std::format integration.\n\n## Key Features\n\n### 🛠️ Rich String Building Interface\n\n- **Fluent API**: Method chaining and stream operators (`\u003c\u003c`) for natural concatenation\n- **Variadic append()**: Batch multiple arguments in a single call for optimal performance\n- **Type Support**: Strings, string_view, C-strings, characters, and numeric types (int8/16/32/64, uint8/16/32/64, float, double)\n- **C++20 std::format Integration**: Template `format()` method for modern formatting\n- **std::formatter Specializations**: Zero-copy integration with `std::format` for StringBuilder\n- **Capacity Hints**: Pre-allocate buffers with constructor parameter for optimal performance\n- **Direct Buffer Access**: High-performance operations without wrappers\n- **Iterator Support**: Range-based for loops and STL algorithms\n\n### 📊 Real-World Applications\n\n- **Web Servers \u0026 HTTP**: Building request/response strings, headers, JSON payloads\n- **Logging Systems**: High-frequency log message formatting with minimal allocations\n- **SQL Query Generation**: Dynamic query construction from parameters and conditions\n- **Template Rendering**: Efficient HTML/XML generation from templates\n- **Data Serialization**: CSV, JSON, XML output generation with streaming performance\n- **Command-Line Tools**: Building formatted output, tables, and progress indicators\n\n### ⚡ Performance Optimized\n\n- **Small Buffer Optimization (SBO)**: 256-byte stack buffer eliminates heap allocations for most strings\n- **Zero-Copy Operations**: `string_view` access without allocation\n- **Batch Operations**: Variadic append() reduces function call overhead\n- **Sub-Microsecond Operations**: Competitive with {fmt} and Abseil\n- **Memory Efficiency**: Smart capacity management and growth strategies\n\n### 🌍 Cross-Platform Support\n\n- **Operating Systems**: Linux, Windows\n- **Compilers**: GCC 14+, Clang 18+, MSVC 2022+\n- **Thread-Safe**: Each StringBuilder instance is thread-safe when not shared\n- **Consistent Behavior**: Same performance characteristics across platforms\n\n## Quick Start\n\n### Requirements\n\n- C++20 compatible compiler:\n  - **GCC 14+** (14.2.0 tested)\n  - **Clang 18+** (19.1.7 tested)\n  - **MSVC 2022+** (19.44+ tested)\n- CMake 3.20 or higher\n\n### CMake Integration\n\n```cmake\n# --- Library build types ---\noption(NFX_STRINGBUILDER_BUILD_STATIC                 \"Build static library\"               ON )\noption(NFX_STRINGBUILDER_BUILD_SHARED                 \"Build shared library\"               OFF)\n\n# --- Build components ---\noption(NFX_STRINGBUILDER_BUILD_TESTS                  \"Build tests\"                        OFF)\noption(NFX_STRINGBUILDER_BUILD_SAMPLES                \"Build samples\"                      OFF)\noption(NFX_STRINGBUILDER_BUILD_BENCHMARKS             \"Build benchmarks\"                   OFF)\noption(NFX_STRINGBUILDER_BUILD_COMPARATIVE_BENCHMARKS \"Build comparative benchmarks\"       OFF)\noption(NFX_STRINGBUILDER_BUILD_DOCUMENTATION          \"Build Doxygen documentation\"        OFF)\n\n# --- Installation ---\noption(NFX_STRINGBUILDER_INSTALL_PROJECT              \"Install project\"                    OFF)\n\n# --- Packaging ---\noption(NFX_STRINGBUILDER_PACKAGE_SOURCE               \"Enable source package generation\"   OFF)\noption(NFX_STRINGBUILDER_PACKAGE_ARCHIVE              \"Enable TGZ/ZIP package generation\"  OFF)\noption(NFX_STRINGBUILDER_PACKAGE_DEB                  \"Enable DEB package generation\"      OFF)\noption(NFX_STRINGBUILDER_PACKAGE_RPM                  \"Enable RPM package generation\"      OFF)\noption(NFX_STRINGBUILDER_PACKAGE_WIX                  \"Enable WiX Windows installer (MSI)\" OFF)\n```\n\n### Using in Your Project\n\n#### Option 1: Using FetchContent (Recommended)\n\n```cmake\ninclude(FetchContent)\nFetchContent_Declare(\n  nfx-stringbuilder\n  GIT_REPOSITORY https://github.com/nfx-libs/nfx-stringbuilder.git\n  GIT_TAG        main  # or use specific version tag like \"0.1.0\"\n)\nFetchContent_MakeAvailable(nfx-stringbuilder)\n\n# Link with static library\ntarget_link_libraries(your_target PRIVATE nfx-stringbuilder::static)\n```\n\n#### Option 2: As a Git Submodule\n\n```bash\n# Add as submodule\ngit submodule add https://github.com/nfx-libs/nfx-stringbuilder.git third-party/nfx-stringbuilder\n```\n\n```cmake\n# In your CMakeLists.txt\nadd_subdirectory(third-party/nfx-stringbuilder)\ntarget_link_libraries(your_target PRIVATE nfx-stringbuilder::static)\n```\n\n#### Option 3: Using find_package (After Installation)\n\n```cmake\nfind_package(nfx-stringbuilder REQUIRED)\ntarget_link_libraries(your_target PRIVATE nfx-stringbuilder::static)\n```\n\n### Building\n\n**Build Commands:**\n\n```bash\n# Clone the repository\ngit clone https://github.com/nfx-libs/nfx-stringbuilder.git\ncd nfx-stringbuilder\n\n# Create build directory\nmkdir build \u0026\u0026 cd build\n\n# Configure with CMake\ncmake .. -DCMAKE_BUILD_TYPE=Release\n\n# Build the library\ncmake --build . --config Release --parallel\n\n# Run tests (optional)\nctest -C Release --output-on-failure\n\n# Run benchmarks (optional)\n./bin/benchmarks/BM_StringBuilder\n```\n\n### Documentation\n\nnfx-stringbuilder includes API documentation generated with Doxygen.\n\n#### 📚 Online Documentation\n\nThe complete API documentation is available online at:\n**https://nfx-libs.github.io/nfx-stringbuilder**\n\n#### Building Documentation Locally\n\n```bash\n# Configure with documentation enabled\ncmake .. -DCMAKE_BUILD_TYPE=Release -DNFX_STRINGBUILDER_BUILD_DOCUMENTATION=ON\n\n# Build the documentation\ncmake --build . --target nfx-stringbuilder-documentation\n```\n\n#### Requirements\n\n- **Doxygen** - Documentation generation tool\n- **Graphviz Dot** (optional) - For generating class diagrams\n\n#### Accessing Local Documentation\n\nAfter building, open `./build/doc/html/index.html` in your web browser.\n\n## Usage Examples\n\n### Basic String Building\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nint main()\n{\n    // Create a StringBuilder instance\n    StringBuilder builder;\n\n    // Build strings with fluent interface\n    builder.append(\"Hello\")\n           .append(\", \")\n           .append(\"World\")\n           .append(\"!\");\n\n    // Convert to std::string\n    std::string result = builder.toString();\n    // Output: \"Hello, World!\"\n\n    return 0;\n}\n```\n\n### Efficient String Concatenation\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n#include \u003cvector\u003e\n\nusing namespace nfx::string;\n\nstd::string buildReport(const std::vector\u003cstd::string\u003e\u0026 items)\n{\n    StringBuilder builder;\n\n    // Reserve capacity for better performance\n    builder.reserve(1024);\n\n    // Build header\n    builder.append(\"=== Report ===\\n\");\n\n    // Add items\n    for (size_t i = 0; i \u003c items.size(); ++i)\n    {\n        builder.append(\"Item \")\n               .append(std::to_string(i + 1))\n               .append(\": \")\n               .append(items[i])\n               .append(\"\\n\");\n    }\n\n    // Add footer\n    builder.append(\"Total items: \")\n           .append(std::to_string(items.size()));\n\n    return builder.toString();\n}\n```\n\n### Working with Different String Types\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nvoid demonstrateStringTypes()\n{\n    StringBuilder builder;\n\n    // std::string\n    std::string stdStr = \"from std::string\";\n    builder.append(stdStr)\n           .append(\" | \");\n\n    // string_view (zero-copy)\n    std::string_view sv = \"from string_view\";\n    builder.append(sv)\n           .append(\" | \");\n\n    // C-string\n    builder.append(\"from C-string\")\n           .append(\" | \");\n\n    // Single characters\n    builder.append('A')\n           .append('B')\n           .append('C');\n\n    std::string result = builder.toString();\n    // Output: \"from std::string | from string_view | from C-string | ABC\"\n}\n```\n\n### Numeric Type Support\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nvoid demonstrateNumericTypes()\n{\n    StringBuilder builder;\n\n    // Integer types\n    int32_t i32 = -42;\n    uint32_t u32 = 42;\n    int64_t i64 = -9223372036854775807LL;\n    uint64_t u64 = 18446744073709551615ULL;\n\n    builder.append(\"int32_t: \")\n           .append(i32)  // Direct numeric append\n           .append(\", uint32_t: \")\n           .append(u32)\n           .append(\", int64_t: \")\n           .append(i64)\n           .append(\", uint64_t: \")\n           .append(u64);\n\n    // Floating-point types\n    float f = 3.14159f;\n    double d = 2.718281828459045;\n\n    builder.append(\"\\nfloat: \")\n           .append(f)  // Direct numeric append\n           .append(\", double: \")\n           .append(d);\n\n    std::string result = builder.toString();\n    // Output: \"int32_t: -42, uint32_t: 42, int64_t: -9223372036854775807, uint64_t: 18446744073709551615\n    //          float: 3.14159, double: 2.71828\"\n}\n\nvoid demonstrateStreamOperators()\n{\n    StringBuilder builder;\n\n    // Stream operators work with all numeric types\n    int value = 42;\n    double price = 19.99;\n\n    builder \u003c\u003c \"Product #\" \u003c\u003c value \u003c\u003c \" costs $\" \u003c\u003c price;\n\n    std::string result = builder.toString();\n    // Output: \"Product #42 costs $19.99\"\n}\n\nvoid demonstrateVariadicAppend()\n{\n    StringBuilder builder;\n\n    // Append multiple arguments at once\n    int userId = 12345;\n    const char* userName = \"alice\";\n    int64_t timestamp = 1672531200;\n\n    builder.append(\"User \", userId, \" (\", userName, \") logged in at \", timestamp);\n\n    std::string result = builder.toString();\n    // Output: \"User 12345 (alice) logged in at 1672531200\"\n}\n```\n\n### format() Method Integration\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nvoid demonstrateFormatMethod()\n{\n    StringBuilder builder;\n\n    // Using StringBuilder's format() method directly\n    builder.append(\"User: \");\n    builder.format(\"{} (ID: {:08})\", \"Alice\", 123);\n    builder.append(\"\\n\");\n\n    // Format with floating-point precision\n    builder.append(\"Price: \");\n    builder.format(\"${:.2f}\", 19.99);\n    builder.append(\"\\n\");\n\n    // Format with hex and binary\n    builder.append(\"Value: \");\n    builder.format(\"hex=0x{:X}, bin=0b{:b}\", 255, 15);\n\n    std::string result = builder.toString();\n    // Output: \"User: Alice (ID: 00000123)\n    //          Price: $19.99\n    //          Value: hex=0xFF, bin=0b1111\"\n}\n\nvoid demonstrateFormatChaining()\n{\n    StringBuilder builder;\n\n    // format() returns reference for chaining\n    builder.format(\"Name: {}\", \"Bob\")\n           .append(\" | \")\n           .format(\"Age: {}\", 30)\n           .append(\" | \")\n           .format(\"Score: {:.1f}\", 95.7);\n\n    std::string result = builder.toString();\n    // Output: \"Name: Bob | Age: 30 | Score: 95.7\"\n}\n```\n\n### C++20 std::formatter Integration\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n#include \u003cformat\u003e\n\nusing namespace nfx::string;\n\nvoid demonstrateStdFormatter()\n{\n    StringBuilder builder;\n\n    builder.append(\"Hello, \")\n           .append(\"World!\");\n\n    std::string formatted = std::format(\"Result: {}\", builder);\n\n    std::string bufferFormatted = std::format(\"Buffer content: {}\", builder);\n}\n```\n\n### Capacity Hints for Pre-allocation\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nvoid demonstrateCapacityHints()\n{\n    // Pre-allocate 2048 bytes to avoid reallocations\n    StringBuilder builder(2048);\n\n    // Build large strings without reallocation\n    for (int i = 0; i \u003c 100; ++i)\n    {\n        builder.append(\"Item \")\n               .append(std::to_string(i))\n               .append(\": Some long description text here\\n\");\n    }\n\n    std::string result = builder.toString();\n    // No heap reallocations occurred during building\n}\n```\n\n### Direct Buffer Manipulation\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n\nusing namespace nfx::string;\n\nvoid directBufferAccess()\n{\n    StringBuilder builder;\n\n    // Append methods with chaining\n    builder.append(\"Direct \")\n           .append(\"buffer \")\n           .append(\"access\")\n           .append('!');\n\n    // Get size and capacity\n    size_t size = builder.size();         // Current content size\n    size_t capacity = builder.capacity(); // Allocated capacity\n\n    // Zero-copy string_view access\n    std::string_view view = builder.toStringView();\n\n    // Iterator support\n    for (char c : builder)\n    {\n        // Process each character\n    }\n\n    // Clear for reuse\n    builder.clear();\n}\n```\n\n### Multi-threaded Usage\n\n```cpp\n#include \u003cnfx/string/StringBuilder.h\u003e\n#include \u003cthread\u003e\n#include \u003cvector\u003e\n\nusing namespace nfx::string;\n\nvoid threadWorker(int threadId)\n{\n    // Each thread creates its own StringBuilder instance\n    for (int i = 0; i \u003c 100; ++i)\n    {\n        StringBuilder builder;\n\n        builder.append(\"Thread \")\n               .append(std::to_string(threadId))\n               .append(\" - Iteration \")\n               .append(std::to_string(i));\n\n        std::string result = builder.toString();\n        // Process result...\n    }\n}\n\nvoid demonstrateMultithreading()\n{\n    std::vector\u003cstd::thread\u003e threads;\n\n    // Spawn multiple threads\n    for (int i = 0; i \u003c 4; ++i)\n    {\n        threads.emplace_back(threadWorker, i);\n    }\n\n    // Wait for completion\n    for (auto\u0026 t : threads)\n    {\n        t.join();\n    }\n\n    std::cout \u003c\u003c \"All threads completed successfully\\n\";\n}\n```\n\n**Sample Output:**\n\n```\n[INFO] User logged in: username=john.doe, ip=192.168.1.100, timestamp=2025-10-31\n[ERROR] Connection failed: timeout after 30s\n```\n\n## Installation \u0026 Packaging\n\nnfx-stringbuilder provides comprehensive packaging options for distribution.\n\n### Package Generation\n\n```bash\n# Configure with packaging options\ncmake .. -DCMAKE_BUILD_TYPE=Release \\\n         -DNFX_STRINGBUILDER_BUILD_STATIC=ON \\\n         -DNFX_STRINGBUILDER_BUILD_SHARED=ON \\\n         -DNFX_STRINGBUILDER_PACKAGE_ARCHIVE=ON \\\n         -DNFX_STRINGBUILDER_PACKAGE_DEB=ON \\\n         -DNFX_STRINGBUILDER_PACKAGE_RPM=ON\n\n# Generate binary packages\ncmake --build . --target package\n# or\ncd build \u0026\u0026 cpack\n\n# Generate source packages\ncd build \u0026\u0026 cpack --config CPackSourceConfig.cmake\n```\n\n### Supported Package Formats\n\n| Format      | Platform       | Description                        | Requirements |\n| ----------- | -------------- | ---------------------------------- | ------------ |\n| **TGZ/ZIP** | Cross-platform | Compressed archive packages        | None         |\n| **DEB**     | Debian/Ubuntu  | Native Debian packages             | `dpkg-dev`   |\n| **RPM**     | RedHat/SUSE    | Native RPM packages                | `rpm-build`  |\n| **WiX**     | Windows        | Professional MSI installer         | `WiX 3.11+`  |\n| **Source**  | Cross-platform | Source code distribution (TGZ+ZIP) | None         |\n\n### Installation\n\n```bash\n# Linux (DEB-based systems)\nsudo dpkg -i nfx-stringbuilder_*_amd64.deb\n\n# Linux (RPM-based systems)\nsudo rpm -ivh nfx-stringbuilder-*-Linux.rpm\n\n# Windows (MSI installer)\nnfx-stringbuilder-0.1.0-MSVC.msi\n\n# Manual installation (extract archive)\ntar -xzf nfx-stringbuilder-*-Linux.tar.gz -C /usr/local/\n```\n\n## Project Structure\n\n```\nnfx-stringbuilder/\n├── benchmark/     # Performance benchmarks with Google Benchmark\n├── cmake/         # CMake modules and configuration\n├── include/nfx/   # Public headers\n├── samples/       # Example usage and demonstrations\n├── src/           # Implementation files\n└── test/          # Comprehensive unit tests with GoogleTest\n```\n\n## Performance\n\nFor detailed performance metrics and benchmarks, see:\n\n- [Standard benchmarks](benchmark/README.md)\n\n## Roadmap\n\nSee [TODO.md](TODO.md) for upcoming features and project roadmap.\n\n## Changelog\n\nSee the [CHANGELOG.md](CHANGELOG.md) for a detailed history of changes, new features, and bug fixes.\n\n## License\n\nThis project is licensed under the MIT License.\n\n## Dependencies\n\n### Development Dependencies\n\n- **[GoogleTest](https://github.com/google/googletest)**: Testing framework (BSD 3-Clause License) - Development only\n- **[Google Benchmark](https://github.com/google/benchmark)**: Performance benchmarking framework (Apache 2.0 License) - Development only\n- **[{fmt}](https://github.com/fmtlib/fmt)**: Fast formatting library (MIT License) - Benchmarking only\n- **[Abseil](https://github.com/abseil/abseil-cpp)**: C++ common libraries (Apache 2.0 License) - Benchmarking only\n\nAll dependencies are automatically fetched via CMake FetchContent when building the library, tests, or benchmarks.\n\n---\n\n_Updated on January 06, 2026_\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnfx-libs%2Fnfx-stringbuilder","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnfx-libs%2Fnfx-stringbuilder","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnfx-libs%2Fnfx-stringbuilder/lists"}