cppformat （C++ Format） 是一个既轻便、安全，又快捷的开源 C++ 格式化库。它可以用来取代 IOStreams ，同时也是格式输出中较为安全的替代品。

特性

• Two APIs: faster concatenation-based write API and slower (but still very fast) replacement-based format API with positional arguments for localization.
• Write API similar to the one used by IOStreams but stateless allowing faster implementation.
• Format API with format string syntax similar to the one used by str.format in Python.
• Safe printf implementation including the POSIX extension for positional arguments.
• Support for user-defined types.
• High speed: performance of the format API is close to that of glibc's printf and better than performance of IOStreams. See Speed tests and Fast integer to string conversion in C++.
• Small code size both in terms of source code (format consists of a single header file and a single source file) and compiled code. See Compile time and code bloat.
• Reliability: the library has an extensive set of unit tests.
• Safety: the library is fully type safe, errors in format strings are reported using exceptions, automatic memory management prevents buffer overflow errors.
• Ease of use: small self-contained code base, no external dependencies, permissive BSD license.
• Portability with consistent output across platforms and support for older compilers.
• Clean warning-free codebase even on high warning levels (-Wall -Wextra -pedantic).
• Support for wide strings.
• Optional header-only configuration enabled with theFMT_HEADER_ONLYmacro.

示例

This prints Hello, world! to stdout:

fmt::print("Hello, {}!", "world");  // uses Python-like format string syntax  fmt::printf("Hello, %s!", "world"); // uses printf format string syntax

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